15 files changed, 1392 insertions, 560 deletions

diff --git a/crates/ide_completion/src/completions/attribute.rs b/crates/ide_completion/src/completions/attribute.rs
index b1505c74b..c48bb9e66 100644
--- a/crates/ide_completion/src/completions/attribute.rs
+++ b/crates/ide_completion/src/completions/attribute.rs
@@ -3,9 +3,9 @@
 //! This module uses a bit of static metadata to provide completions
 //! for built-in attributes.
 
-use itertools::Itertools;
-use rustc_hash::FxHashSet;
-use syntax::{ast, AstNode, T};
+use once_cell::sync::Lazy;
+use rustc_hash::{FxHashMap, FxHashSet};
+use syntax::{algo::non_trivia_sibling, ast, AstNode, Direction, NodeOrToken, SyntaxKind, T};
 
 use crate::{
     context::CompletionContext,
@@ -14,33 +14,45 @@ use crate::{
     Completions,
 };
 
-pub(crate) fn complete_attribute(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
-    if ctx.mod_declaration_under_caret.is_some() {
-        return None;
-    }
+mod derive;
+mod lint;
+pub(crate) use self::lint::LintCompletion;
 
+pub(crate) fn complete_attribute(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
     let attribute = ctx.attribute_under_caret.as_ref()?;
-    match (attribute.path(), attribute.token_tree()) {
-        (Some(path), Some(token_tree)) => {
-            let path = path.syntax().text();
-            if path == "derive" {
-                complete_derive(acc, ctx, token_tree)
-            } else if path == "feature" {
-                complete_lint(acc, ctx, token_tree, FEATURES)
-            } else if path == "allow" || path == "warn" || path == "deny" || path == "forbid" {
-                complete_lint(acc, ctx, token_tree.clone(), DEFAULT_LINT_COMPLETIONS);
-                complete_lint(acc, ctx, token_tree, CLIPPY_LINTS);
+    match (attribute.path().and_then(|p| p.as_single_name_ref()), attribute.token_tree()) {
+        (Some(path), Some(token_tree)) => match path.text().as_str() {
+            "derive" => derive::complete_derive(acc, ctx, token_tree),
+            "feature" => lint::complete_lint(acc, ctx, token_tree, FEATURES),
+            "allow" | "warn" | "deny" | "forbid" => {
+                lint::complete_lint(acc, ctx, token_tree.clone(), lint::DEFAULT_LINT_COMPLETIONS);
+                lint::complete_lint(acc, ctx, token_tree, CLIPPY_LINTS);
             }
-        }
-        (_, Some(_token_tree)) => {}
-        _ => complete_attribute_start(acc, ctx, attribute),
+            _ => (),
+        },
+        (None, Some(_)) => (),
+        _ => complete_new_attribute(acc, ctx, attribute),
     }
     Some(())
 }
 
-fn complete_attribute_start(acc: &mut Completions, ctx: &CompletionContext, attribute: &ast::Attr) {
+fn complete_new_attribute(acc: &mut Completions, ctx: &CompletionContext, attribute: &ast::Attr) {
     let is_inner = attribute.kind() == ast::AttrKind::Inner;
-    for attr_completion in ATTRIBUTES.iter().filter(|compl| is_inner || !compl.prefer_inner) {
+    let attribute_annotated_item_kind =
+        attribute.syntax().parent().map(|it| it.kind()).filter(|_| {
+            is_inner
+            // If we got nothing coming after the attribute it could be anything so filter it the kind out
+                || non_trivia_sibling(attribute.syntax().clone().into(), Direction::Next).is_some()
+        });
+    let attributes = attribute_annotated_item_kind.and_then(|kind| {
+        if ast::Expr::can_cast(kind) {
+            Some(EXPR_ATTRIBUTES)
+        } else {
+            KIND_TO_ATTRIBUTES.get(&kind).copied()
+        }
+    });
+
+    let add_completion = |attr_completion: &AttrCompletion| {
         let mut item = CompletionItem::new(
             CompletionKind::Attribute,
             ctx.source_range(),
@@ -56,9 +68,19 @@ fn complete_attribute_start(acc: &mut Completions, ctx: &CompletionContext, attr
             item.insert_snippet(cap, snippet);
         }
 
-        if attribute.kind() == ast::AttrKind::Inner || !attr_completion.prefer_inner {
+        if is_inner || !attr_completion.prefer_inner {
             acc.add(item.build());
         }
+    };
+
+    match attributes {
+        Some(applicable) => applicable
+            .iter()
+            .flat_map(|name| ATTRIBUTES.binary_search_by(|attr| attr.key().cmp(name)).ok())
+            .flat_map(|idx| ATTRIBUTES.get(idx))
+            .for_each(add_completion),
+        None if is_inner => ATTRIBUTES.iter().for_each(add_completion),
+        None => ATTRIBUTES.iter().filter(|compl| !compl.prefer_inner).for_each(add_completion),
     }
 }
 
@@ -70,6 +92,10 @@ struct AttrCompletion {
 }
 
 impl AttrCompletion {
+    fn key(&self) -> &'static str {
+        self.lookup.unwrap_or(self.label)
+    }
+
     const fn prefer_inner(self) -> AttrCompletion {
         AttrCompletion { prefer_inner: true, ..self }
     }
@@ -83,30 +109,122 @@ const fn attr(
     AttrCompletion { label, lookup, snippet, prefer_inner: false }
 }
 
+macro_rules! attrs {
+    // attributes applicable to all items
+    [@ { item $($tt:tt)* } {$($acc:tt)*}] => {
+        attrs!(@ { $($tt)* } { $($acc)*, "deprecated", "doc", "dochidden", "docalias", "must_use", "no_mangle" })
+    };
+    // attributes applicable to all adts
+    [@ { adt $($tt:tt)* } {$($acc:tt)*}] => {
+        attrs!(@ { $($tt)* } { $($acc)*, "derive", "repr" })
+    };
+    // attributes applicable to all linkable things aka functions/statics
+    [@ { linkable $($tt:tt)* } {$($acc:tt)*}] => {
+        attrs!(@ { $($tt)* } { $($acc)*, "export_name", "link_name", "link_section" })
+    };
+    // error fallback for nicer error message
+    [@ { $ty:ident $($tt:tt)* } {$($acc:tt)*}] => {
+        compile_error!(concat!("unknown attr subtype ", stringify!($ty)))
+    };
+    // general push down accumulation
+    [@ { $lit:literal $($tt:tt)*} {$($acc:tt)*}] => {
+        attrs!(@ { $($tt)* } { $($acc)*, $lit })
+    };
+    [@ {$($tt:tt)+} {$($tt2:tt)*}] => {
+        compile_error!(concat!("Unexpected input ", stringify!($($tt)+)))
+    };
+    // final output construction
+    [@ {} {$($tt:tt)*}] => { &[$($tt)*] as _ };
+    // starting matcher
+    [$($tt:tt),*] => {
+        attrs!(@ { $($tt)* } { "allow", "cfg", "cfg_attr", "deny", "forbid", "warn" })
+    };
+}
+
+#[rustfmt::skip]
+static KIND_TO_ATTRIBUTES: Lazy<FxHashMap<SyntaxKind, &[&str]>> = Lazy::new(|| {
+    use SyntaxKind::*;
+    std::array::IntoIter::new([
+        (
+            SOURCE_FILE,
+            attrs!(
+                item,
+                "crate_name", "feature", "no_implicit_prelude", "no_main", "no_std",
+                "recursion_limit", "type_length_limit", "windows_subsystem"
+            ),
+        ),
+        (MODULE, attrs!(item, "no_implicit_prelude", "path")),
+        (ITEM_LIST, attrs!(item, "no_implicit_prelude")),
+        (MACRO_RULES, attrs!(item, "macro_export", "macro_use")),
+        (MACRO_DEF, attrs!(item)),
+        (EXTERN_CRATE, attrs!(item, "macro_use", "no_link")),
+        (USE, attrs!(item)),
+        (TYPE_ALIAS, attrs!(item)),
+        (STRUCT, attrs!(item, adt, "non_exhaustive")),
+        (ENUM, attrs!(item, adt, "non_exhaustive")),
+        (UNION, attrs!(item, adt)),
+        (CONST, attrs!(item)),
+        (
+            FN,
+            attrs!(
+                item, linkable,
+                "cold", "ignore", "inline", "must_use", "panic_handler", "proc_macro",
+                "proc_macro_derive", "proc_macro_attribute", "should_panic", "target_feature",
+                "test", "track_caller"
+            ),
+        ),
+        (STATIC, attrs!(item, linkable, "global_allocator", "used")),
+        (TRAIT, attrs!(item, "must_use")),
+        (IMPL, attrs!(item, "automatically_derived")),
+        (ASSOC_ITEM_LIST, attrs!(item)),
+        (EXTERN_BLOCK, attrs!(item, "link")),
+        (EXTERN_ITEM_LIST, attrs!(item, "link")),
+        (MACRO_CALL, attrs!()),
+        (SELF_PARAM, attrs!()),
+        (PARAM, attrs!()),
+        (RECORD_FIELD, attrs!()),
+        (VARIANT, attrs!("non_exhaustive")),
+        (TYPE_PARAM, attrs!()),
+        (CONST_PARAM, attrs!()),
+        (LIFETIME_PARAM, attrs!()),
+        (LET_STMT, attrs!()),
+        (EXPR_STMT, attrs!()),
+        (LITERAL, attrs!()),
+        (RECORD_EXPR_FIELD_LIST, attrs!()),
+        (RECORD_EXPR_FIELD, attrs!()),
+        (MATCH_ARM_LIST, attrs!()),
+        (MATCH_ARM, attrs!()),
+        (IDENT_PAT, attrs!()),
+        (RECORD_PAT_FIELD, attrs!()),
+    ])
+    .collect()
+});
+const EXPR_ATTRIBUTES: &[&str] = attrs!();
+
 /// https://doc.rust-lang.org/reference/attributes.html#built-in-attributes-index
+// Keep these sorted for the binary search!
 const ATTRIBUTES: &[AttrCompletion] = &[
     attr("allow(…)", Some("allow"), Some("allow(${0:lint})")),
     attr("automatically_derived", None, None),
-    attr("cfg_attr(…)", Some("cfg_attr"), Some("cfg_attr(${1:predicate}, ${0:attr})")),
     attr("cfg(…)", Some("cfg"), Some("cfg(${0:predicate})")),
+    attr("cfg_attr(…)", Some("cfg_attr"), Some("cfg_attr(${1:predicate}, ${0:attr})")),
     attr("cold", None, None),
     attr(r#"crate_name = """#, Some("crate_name"), Some(r#"crate_name = "${0:crate_name}""#))
         .prefer_inner(),
     attr("deny(…)", Some("deny"), Some("deny(${0:lint})")),
     attr(r#"deprecated"#, Some("deprecated"), Some(r#"deprecated"#)),
     attr("derive(…)", Some("derive"), Some(r#"derive(${0:Debug})"#)),
+    attr(r#"doc = "…""#, Some("doc"), Some(r#"doc = "${0:docs}""#)),
+    attr(r#"doc(alias = "…")"#, Some("docalias"), Some(r#"doc(alias = "${0:docs}")"#)),
+    attr(r#"doc(hidden)"#, Some("dochidden"), Some(r#"doc(hidden)"#)),
     attr(
         r#"export_name = "…""#,
         Some("export_name"),
         Some(r#"export_name = "${0:exported_symbol_name}""#),
     ),
-    attr(r#"doc(alias = "…")"#, Some("docalias"), Some(r#"doc(alias = "${0:docs}")"#)),
-    attr(r#"doc = "…""#, Some("doc"), Some(r#"doc = "${0:docs}""#)),
-    attr(r#"doc(hidden)"#, Some("dochidden"), Some(r#"doc(hidden)"#)),
     attr("feature(…)", Some("feature"), Some("feature(${0:flag})")).prefer_inner(),
     attr("forbid(…)", Some("forbid"), Some("forbid(${0:lint})")),
-    // FIXME: resolve through macro resolution?
-    attr("global_allocator", None, None).prefer_inner(),
+    attr("global_allocator", None, None),
     attr(r#"ignore = "…""#, Some("ignore"), Some(r#"ignore = "${0:reason}""#)),
     attr("inline", Some("inline"), Some("inline")),
     attr("link", None, None),
@@ -119,13 +237,13 @@ const ATTRIBUTES: &[AttrCompletion] = &[
     attr("macro_export", None, None),
     attr("macro_use", None, None),
     attr(r#"must_use"#, Some("must_use"), Some(r#"must_use"#)),
-    attr("no_link", None, None).prefer_inner(),
     attr("no_implicit_prelude", None, None).prefer_inner(),
+    attr("no_link", None, None).prefer_inner(),
     attr("no_main", None, None).prefer_inner(),
     attr("no_mangle", None, None),
     attr("no_std", None, None).prefer_inner(),
     attr("non_exhaustive", None, None),
-    attr("panic_handler", None, None).prefer_inner(),
+    attr("panic_handler", None, None),
     attr(r#"path = "…""#, Some("path"), Some(r#"path ="${0:path}""#)),
     attr("proc_macro", None, None),
     attr("proc_macro_attribute", None, None),
@@ -153,381 +271,539 @@ const ATTRIBUTES: &[AttrCompletion] = &[
     .prefer_inner(),
 ];
 
-fn complete_derive(acc: &mut Completions, ctx: &CompletionContext, derive_input: ast::TokenTree) {
-    if let Ok(existing_derives) = parse_comma_sep_input(derive_input) {
-        for derive_completion in DEFAULT_DERIVE_COMPLETIONS
-            .iter()
-            .filter(|completion| !existing_derives.contains(completion.label))
-        {
-            let mut components = vec![derive_completion.label];
-            components.extend(
-                derive_completion
-                    .dependencies
-                    .iter()
-                    .filter(|&&dependency| !existing_derives.contains(dependency)),
-            );
-            let lookup = components.join(", ");
-            let label = components.iter().rev().join(", ");
-            let mut item =
-                CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), label);
-            item.lookup_by(lookup).kind(CompletionItemKind::Attribute);
-            item.add_to(acc);
+fn parse_comma_sep_input(derive_input: ast::TokenTree) -> Option<FxHashSet<String>> {
+    let (l_paren, r_paren) = derive_input.l_paren_token().zip(derive_input.r_paren_token())?;
+    let mut input_derives = FxHashSet::default();
+    let mut tokens = derive_input
+        .syntax()
+        .children_with_tokens()
+        .filter_map(NodeOrToken::into_token)
+        .skip_while(|token| token != &l_paren)
+        .skip(1)
+        .take_while(|token| token != &r_paren)
+        .peekable();
+    let mut input = String::new();
+    while tokens.peek().is_some() {
+        for token in tokens.by_ref().take_while(|t| t.kind() != T![,]) {
+            input.push_str(token.text());
         }
 
-        for custom_derive_name in get_derive_names_in_scope(ctx).difference(&existing_derives) {
-            let mut item = CompletionItem::new(
-                CompletionKind::Attribute,
-                ctx.source_range(),
-                custom_derive_name,
-            );
-            item.kind(CompletionItemKind::Attribute);
-            item.add_to(acc);
+        if !input.is_empty() {
+            input_derives.insert(input.trim().to_owned());
         }
-    }
-}
-
-fn complete_lint(
-    acc: &mut Completions,
-    ctx: &CompletionContext,
-    derive_input: ast::TokenTree,
-    lints_completions: &[LintCompletion],
-) {
-    if let Ok(existing_lints) = parse_comma_sep_input(derive_input) {
-        for lint_completion in lints_completions
-            .into_iter()
-            .filter(|completion| !existing_lints.contains(completion.label))
-        {
-            let mut item = CompletionItem::new(
-                CompletionKind::Attribute,
-                ctx.source_range(),
-                lint_completion.label,
-            );
-            item.kind(CompletionItemKind::Attribute).detail(lint_completion.description);
-            item.add_to(acc)
-        }
-    }
-}
-
-fn parse_comma_sep_input(derive_input: ast::TokenTree) -> Result<FxHashSet<String>, ()> {
-    match (derive_input.left_delimiter_token(), derive_input.right_delimiter_token()) {
-        (Some(left_paren), Some(right_paren))
-            if left_paren.kind() == T!['('] && right_paren.kind() == T![')'] =>
-        {
-            let mut input_derives = FxHashSet::default();
-            let mut current_derive = String::new();
-            for token in derive_input
-                .syntax()
-                .children_with_tokens()
-                .filter_map(|token| token.into_token())
-                .skip_while(|token| token != &left_paren)
-                .skip(1)
-                .take_while(|token| token != &right_paren)
-            {
-                if T![,] == token.kind() {
-                    if !current_derive.is_empty() {
-                        input_derives.insert(current_derive);
-                        current_derive = String::new();
-                    }
-                } else {
-                    current_derive.push_str(token.text().trim());
-                }
-            }
 
-            if !current_derive.is_empty() {
-                input_derives.insert(current_derive);
-            }
-            Ok(input_derives)
-        }
-        _ => Err(()),
+        input.clear();
     }
-}
-
-fn get_derive_names_in_scope(ctx: &CompletionContext) -> FxHashSet<String> {
-    let mut result = FxHashSet::default();
-    ctx.scope.process_all_names(&mut |name, scope_def| {
-        if let hir::ScopeDef::MacroDef(mac) = scope_def {
-            // FIXME kind() doesn't check whether proc-macro is a derive
-            if mac.kind() == hir::MacroKind::Derive || mac.kind() == hir::MacroKind::ProcMacro {
-                result.insert(name.to_string());
-            }
-        }
-    });
-    result
-}
-
-struct DeriveCompletion {
-    label: &'static str,
-    dependencies: &'static [&'static str],
-}
-
-/// Standard Rust derives and the information about their dependencies
-/// (the dependencies are needed so that the main derive don't break the compilation when added)
-const DEFAULT_DERIVE_COMPLETIONS: &[DeriveCompletion] = &[
-    DeriveCompletion { label: "Clone", dependencies: &[] },
-    DeriveCompletion { label: "Copy", dependencies: &["Clone"] },
-    DeriveCompletion { label: "Debug", dependencies: &[] },
-    DeriveCompletion { label: "Default", dependencies: &[] },
-    DeriveCompletion { label: "Hash", dependencies: &[] },
-    DeriveCompletion { label: "PartialEq", dependencies: &[] },
-    DeriveCompletion { label: "Eq", dependencies: &["PartialEq"] },
-    DeriveCompletion { label: "PartialOrd", dependencies: &["PartialEq"] },
-    DeriveCompletion { label: "Ord", dependencies: &["PartialOrd", "Eq", "PartialEq"] },
-];
 
-pub(crate) struct LintCompletion {
-    pub(crate) label: &'static str,
-    pub(crate) description: &'static str,
+    Some(input_derives)
 }
 
-#[rustfmt::skip]
-const DEFAULT_LINT_COMPLETIONS: &[LintCompletion] = &[
-    LintCompletion { label: "absolute_paths_not_starting_with_crate", description: r#"fully qualified paths that start with a module name instead of `crate`, `self`, or an extern crate name"# },
-    LintCompletion { label: "anonymous_parameters", description: r#"detects anonymous parameters"# },
-    LintCompletion { label: "box_pointers", description: r#"use of owned (Box type) heap memory"# },
-    LintCompletion { label: "deprecated_in_future", description: r#"detects use of items that will be deprecated in a future version"# },
-    LintCompletion { label: "elided_lifetimes_in_paths", description: r#"hidden lifetime parameters in types are deprecated"# },
-    LintCompletion { label: "explicit_outlives_requirements", description: r#"outlives requirements can be inferred"# },
-    LintCompletion { label: "indirect_structural_match", description: r#"pattern with const indirectly referencing non-structural-match type"# },
-    LintCompletion { label: "keyword_idents", description: r#"detects edition keywords being used as an identifier"# },
-    LintCompletion { label: "macro_use_extern_crate", description: r#"the `#[macro_use]` attribute is now deprecated in favor of using macros via the module system"# },
-    LintCompletion { label: "meta_variable_misuse", description: r#"possible meta-variable misuse at macro definition"# },
-    LintCompletion { label: "missing_copy_implementations", description: r#"detects potentially-forgotten implementations of `Copy`"# },
-    LintCompletion { label: "missing_crate_level_docs", description: r#"detects crates with no crate-level documentation"# },
-    LintCompletion { label: "missing_debug_implementations", description: r#"detects missing implementations of Debug"# },
-    LintCompletion { label: "missing_docs", description: r#"detects missing documentation for public members"# },
-    LintCompletion { label: "missing_doc_code_examples", description: r#"detects publicly-exported items without code samples in their documentation"# },
-    LintCompletion { label: "non_ascii_idents", description: r#"detects non-ASCII identifiers"# },
-    LintCompletion { label: "private_doc_tests", description: r#"detects code samples in docs of private items not documented by rustdoc"# },
-    LintCompletion { label: "single_use_lifetimes", description: r#"detects lifetime parameters that are only used once"# },
-    LintCompletion { label: "trivial_casts", description: r#"detects trivial casts which could be removed"# },
-    LintCompletion { label: "trivial_numeric_casts", description: r#"detects trivial casts of numeric types which could be removed"# },
-    LintCompletion { label: "unaligned_references", description: r#"detects unaligned references to fields of packed structs"# },
-    LintCompletion { label: "unreachable_pub", description: r#"`pub` items not reachable from crate root"# },
-    LintCompletion { label: "unsafe_code", description: r#"usage of `unsafe` code"# },
-    LintCompletion { label: "unsafe_op_in_unsafe_fn", description: r#"unsafe operations in unsafe functions without an explicit unsafe block are deprecated"# },
-    LintCompletion { label: "unstable_features", description: r#"enabling unstable features (deprecated. do not use)"# },
-    LintCompletion { label: "unused_crate_dependencies", description: r#"crate dependencies that are never used"# },
-    LintCompletion { label: "unused_extern_crates", description: r#"extern crates that are never used"# },
-    LintCompletion { label: "unused_import_braces", description: r#"unnecessary braces around an imported item"# },
-    LintCompletion { label: "unused_lifetimes", description: r#"detects lifetime parameters that are never used"# },
-    LintCompletion { label: "unused_qualifications", description: r#"detects unnecessarily qualified names"# },
-    LintCompletion { label: "unused_results", description: r#"unused result of an expression in a statement"# },
-    LintCompletion { label: "variant_size_differences", description: r#"detects enums with widely varying variant sizes"# },
-    LintCompletion { label: "array_into_iter", description: r#"detects calling `into_iter` on arrays"# },
-    LintCompletion { label: "asm_sub_register", description: r#"using only a subset of a register for inline asm inputs"# },
-    LintCompletion { label: "bare_trait_objects", description: r#"suggest using `dyn Trait` for trait objects"# },
-    LintCompletion { label: "bindings_with_variant_name", description: r#"detects pattern bindings with the same name as one of the matched variants"# },
-    LintCompletion { label: "cenum_impl_drop_cast", description: r#"a C-like enum implementing Drop is cast"# },
-    LintCompletion { label: "clashing_extern_declarations", description: r#"detects when an extern fn has been declared with the same name but different types"# },
-    LintCompletion { label: "coherence_leak_check", description: r#"distinct impls distinguished only by the leak-check code"# },
-    LintCompletion { label: "confusable_idents", description: r#"detects visually confusable pairs between identifiers"# },
-    LintCompletion { label: "dead_code", description: r#"detect unused, unexported items"# },
-    LintCompletion { label: "deprecated", description: r#"detects use of deprecated items"# },
-    LintCompletion { label: "ellipsis_inclusive_range_patterns", description: r#"`...` range patterns are deprecated"# },
-    LintCompletion { label: "exported_private_dependencies", description: r#"public interface leaks type from a private dependency"# },
-    LintCompletion { label: "illegal_floating_point_literal_pattern", description: r#"floating-point literals cannot be used in patterns"# },
-    LintCompletion { label: "improper_ctypes", description: r#"proper use of libc types in foreign modules"# },
-    LintCompletion { label: "improper_ctypes_definitions", description: r#"proper use of libc types in foreign item definitions"# },
-    LintCompletion { label: "incomplete_features", description: r#"incomplete features that may function improperly in some or all cases"# },
-    LintCompletion { label: "inline_no_sanitize", description: r#"detects incompatible use of `#[inline(always)]` and `#[no_sanitize(...)]`"# },
-    LintCompletion { label: "intra_doc_link_resolution_failure", description: r#"failures in resolving intra-doc link targets"# },
-    LintCompletion { label: "invalid_codeblock_attributes", description: r#"codeblock attribute looks a lot like a known one"# },
-    LintCompletion { label: "invalid_value", description: r#"an invalid value is being created (such as a NULL reference)"# },
-    LintCompletion { label: "irrefutable_let_patterns", description: r#"detects irrefutable patterns in if-let and while-let statements"# },
-    LintCompletion { label: "late_bound_lifetime_arguments", description: r#"detects generic lifetime arguments in path segments with late bound lifetime parameters"# },
-    LintCompletion { label: "mixed_script_confusables", description: r#"detects Unicode scripts whose mixed script confusables codepoints are solely used"# },
-    LintCompletion { label: "mutable_borrow_reservation_conflict", description: r#"reservation of a two-phased borrow conflicts with other shared borrows"# },
-    LintCompletion { label: "non_camel_case_types", description: r#"types, variants, traits and type parameters should have camel case names"# },
-    LintCompletion { label: "non_shorthand_field_patterns", description: r#"using `Struct { x: x }` instead of `Struct { x }` in a pattern"# },
-    LintCompletion { label: "non_snake_case", description: r#"variables, methods, functions, lifetime parameters and modules should have snake case names"# },
-    LintCompletion { label: "non_upper_case_globals", description: r#"static constants should have uppercase identifiers"# },
-    LintCompletion { label: "no_mangle_generic_items", description: r#"generic items must be mangled"# },
-    LintCompletion { label: "overlapping_patterns", description: r#"detects overlapping patterns"# },
-    LintCompletion { label: "path_statements", description: r#"path statements with no effect"# },
-    LintCompletion { label: "private_in_public", description: r#"detect private items in public interfaces not caught by the old implementation"# },
-    LintCompletion { label: "proc_macro_derive_resolution_fallback", description: r#"detects proc macro derives using inaccessible names from parent modules"# },
-    LintCompletion { label: "redundant_semicolons", description: r#"detects unnecessary trailing semicolons"# },
-    LintCompletion { label: "renamed_and_removed_lints", description: r#"lints that have been renamed or removed"# },
-    LintCompletion { label: "safe_packed_borrows", description: r#"safe borrows of fields of packed structs were erroneously allowed"# },
-    LintCompletion { label: "stable_features", description: r#"stable features found in `#[feature]` directive"# },
-    LintCompletion { label: "trivial_bounds", description: r#"these bounds don't depend on an type parameters"# },
-    LintCompletion { label: "type_alias_bounds", description: r#"bounds in type aliases are not enforced"# },
-    LintCompletion { label: "tyvar_behind_raw_pointer", description: r#"raw pointer to an inference variable"# },
-    LintCompletion { label: "uncommon_codepoints", description: r#"detects uncommon Unicode codepoints in identifiers"# },
-    LintCompletion { label: "unconditional_recursion", description: r#"functions that cannot return without calling themselves"# },
-    LintCompletion { label: "unknown_lints", description: r#"unrecognized lint attribute"# },
-    LintCompletion { label: "unnameable_test_items", description: r#"detects an item that cannot be named being marked as `#[test_case]`"# },
-    LintCompletion { label: "unreachable_code", description: r#"detects unreachable code paths"# },
-    LintCompletion { label: "unreachable_patterns", description: r#"detects unreachable patterns"# },
-    LintCompletion { label: "unstable_name_collisions", description: r#"detects name collision with an existing but unstable method"# },
-    LintCompletion { label: "unused_allocation", description: r#"detects unnecessary allocations that can be eliminated"# },
-    LintCompletion { label: "unused_assignments", description: r#"detect assignments that will never be read"# },
-    LintCompletion { label: "unused_attributes", description: r#"detects attributes that were not used by the compiler"# },
-    LintCompletion { label: "unused_braces", description: r#"unnecessary braces around an expression"# },
-    LintCompletion { label: "unused_comparisons", description: r#"comparisons made useless by limits of the types involved"# },
-    LintCompletion { label: "unused_doc_comments", description: r#"detects doc comments that aren't used by rustdoc"# },
-    LintCompletion { label: "unused_features", description: r#"unused features found in crate-level `#[feature]` directives"# },
-    LintCompletion { label: "unused_imports", description: r#"imports that are never used"# },
-    LintCompletion { label: "unused_labels", description: r#"detects labels that are never used"# },
-    LintCompletion { label: "unused_macros", description: r#"detects macros that were not used"# },
-    LintCompletion { label: "unused_must_use", description: r#"unused result of a type flagged as `#[must_use]`"# },
-    LintCompletion { label: "unused_mut", description: r#"detect mut variables which don't need to be mutable"# },
-    LintCompletion { label: "unused_parens", description: r#"`if`, `match`, `while` and `return` do not need parentheses"# },
-    LintCompletion { label: "unused_unsafe", description: r#"unnecessary use of an `unsafe` block"# },
-    LintCompletion { label: "unused_variables", description: r#"detect variables which are not used in any way"# },
-    LintCompletion { label: "warnings", description: r#"mass-change the level for lints which produce warnings"# },
-    LintCompletion { label: "where_clauses_object_safety", description: r#"checks the object safety of where clauses"# },
-    LintCompletion { label: "while_true", description: r#"suggest using `loop { }` instead of `while true { }`"# },
-    LintCompletion { label: "ambiguous_associated_items", description: r#"ambiguous associated items"# },
-    LintCompletion { label: "arithmetic_overflow", description: r#"arithmetic operation overflows"# },
-    LintCompletion { label: "conflicting_repr_hints", description: r#"conflicts between `#[repr(..)]` hints that were previously accepted and used in practice"# },
-    LintCompletion { label: "const_err", description: r#"constant evaluation detected erroneous expression"# },
-    LintCompletion { label: "ill_formed_attribute_input", description: r#"ill-formed attribute inputs that were previously accepted and used in practice"# },
-    LintCompletion { label: "incomplete_include", description: r#"trailing content in included file"# },
-    LintCompletion { label: "invalid_type_param_default", description: r#"type parameter default erroneously allowed in invalid location"# },
-    LintCompletion { label: "macro_expanded_macro_exports_accessed_by_absolute_paths", description: r#"macro-expanded `macro_export` macros from the current crate cannot be referred to by absolute paths"# },
-    LintCompletion { label: "missing_fragment_specifier", description: r#"detects missing fragment specifiers in unused `macro_rules!` patterns"# },
-    LintCompletion { label: "mutable_transmutes", description: r#"mutating transmuted &mut T from &T may cause undefined behavior"# },
-    LintCompletion { label: "no_mangle_const_items", description: r#"const items will not have their symbols exported"# },
-    LintCompletion { label: "order_dependent_trait_objects", description: r#"trait-object types were treated as different depending on marker-trait order"# },
-    LintCompletion { label: "overflowing_literals", description: r#"literal out of range for its type"# },
-    LintCompletion { label: "patterns_in_fns_without_body", description: r#"patterns in functions without body were erroneously allowed"# },
-    LintCompletion { label: "pub_use_of_private_extern_crate", description: r#"detect public re-exports of private extern crates"# },
-    LintCompletion { label: "soft_unstable", description: r#"a feature gate that doesn't break dependent crates"# },
-    LintCompletion { label: "unconditional_panic", description: r#"operation will cause a panic at runtime"# },
-    LintCompletion { label: "unknown_crate_types", description: r#"unknown crate type found in `#[crate_type]` directive"# },
-];
-
 #[cfg(test)]
 mod tests {
+    use super::*;
+
     use expect_test::{expect, Expect};
 
     use crate::{test_utils::completion_list, CompletionKind};
 
+    #[test]
+    fn attributes_are_sorted() {
+        let mut attrs = ATTRIBUTES.iter().map(|attr| attr.key());
+        let mut prev = attrs.next().unwrap();
+
+        attrs.for_each(|next| {
+            assert!(
+                prev < next,
+                r#"ATTRIBUTES array is not sorted, "{}" should come after "{}""#,
+                prev,
+                next
+            );
+            prev = next;
+        });
+    }
+
     fn check(ra_fixture: &str, expect: Expect) {
         let actual = completion_list(ra_fixture, CompletionKind::Attribute);
         expect.assert_eq(&actual);
     }
 
     #[test]
-    fn empty_derive_completion() {
+    fn test_attribute_completion_inside_nested_attr() {
+        check(r#"#[cfg($0)]"#, expect![[]])
+    }
+
+    #[test]
+    fn test_attribute_completion_with_existing_attr() {
         check(
-            r#"
-#[derive($0)]
-struct Test {}
-        "#,
+            r#"#[no_mangle] #[$0] mcall!();"#,
             expect![[r#"
-                at Clone
-                at Clone, Copy
-                at Debug
-                at Default
-                at Hash
-                at PartialEq
-                at PartialEq, Eq
-                at PartialEq, PartialOrd
-                at PartialEq, Eq, PartialOrd, Ord
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+            "#]],
+        )
+    }
+
+    #[test]
+    fn complete_attribute_on_source_file() {
+        check(
+            r#"#![$0]"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at crate_name = ""
+                at feature(…)
+                at no_implicit_prelude
+                at no_main
+                at no_std
+                at recursion_limit = …
+                at type_length_limit = …
+                at windows_subsystem = "…"
             "#]],
         );
     }
 
     #[test]
-    fn no_completion_for_incorrect_derive() {
+    fn complete_attribute_on_module() {
         check(
-            r#"
-#[derive{$0)]
-struct Test {}
-"#,
-            expect![[r#""#]],
-        )
+            r#"#[$0] mod foo;"#,
+            expect![[r#"
+            at allow(…)
+            at cfg(…)
+            at cfg_attr(…)
+            at deny(…)
+            at forbid(…)
+            at warn(…)
+            at deprecated
+            at doc = "…"
+            at doc(hidden)
+            at doc(alias = "…")
+            at must_use
+            at no_mangle
+            at path = "…"
+        "#]],
+        );
+        check(
+            r#"mod foo {#![$0]}"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at no_implicit_prelude
+            "#]],
+        );
     }
 
     #[test]
-    fn derive_with_input_completion() {
+    fn complete_attribute_on_macro_rules() {
         check(
-            r#"
-#[derive(serde::Serialize, PartialEq, $0)]
-struct Test {}
-"#,
+            r#"#[$0] macro_rules! foo {}"#,
             expect![[r#"
-                at Clone
-                at Clone, Copy
-                at Debug
-                at Default
-                at Hash
-                at Eq
-                at PartialOrd
-                at Eq, PartialOrd, Ord
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at macro_export
+                at macro_use
             "#]],
-        )
+        );
     }
 
     #[test]
-    fn test_attribute_completion() {
+    fn complete_attribute_on_macro_def() {
         check(
-            r#"#[$0]"#,
+            r#"#[$0] macro foo {}"#,
             expect![[r#"
                 at allow(…)
-                at automatically_derived
+                at cfg(…)
                 at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_extern_crate() {
+        check(
+            r#"#[$0] extern crate foo;"#,
+            expect![[r#"
+                at allow(…)
                 at cfg(…)
-                at cold
+                at cfg_attr(…)
                 at deny(…)
+                at forbid(…)
+                at warn(…)
                 at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at macro_use
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_use() {
+        check(
+            r#"#[$0] use foo;"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_type_alias() {
+        check(
+            r#"#[$0] type foo = ();"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_struct() {
+        check(
+            r#"#[$0] struct Foo;"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
                 at derive(…)
-                at export_name = "…"
+                at repr(…)
+                at non_exhaustive
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_enum() {
+        check(
+            r#"#[$0] enum Foo {}"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
                 at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at derive(…)
+                at repr(…)
+                at non_exhaustive
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_const() {
+        check(
+            r#"#[$0] const FOO: () = ();"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
                 at doc = "…"
                 at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_static() {
+        check(
+            r#"#[$0] static FOO: () = ()"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
                 at forbid(…)
-                at ignore = "…"
-                at inline
-                at link
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at export_name = "…"
                 at link_name = "…"
                 at link_section = "…"
-                at macro_export
-                at macro_use
+                at global_allocator
+                at used
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_trait() {
+        check(
+            r#"#[$0] trait Foo {}"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at must_use
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_impl() {
+        check(
+            r#"#[$0] impl () {}"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at automatically_derived
+            "#]],
+        );
+        check(
+            r#"impl () {#![$0]}"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
                 at must_use
                 at no_mangle
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_extern_block() {
+        check(
+            r#"#[$0] extern {}"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at link
+            "#]],
+        );
+        check(
+            r#"extern {#![$0]}"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at link
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_variant() {
+        check(
+            r#"enum Foo { #[$0] Bar }"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
                 at non_exhaustive
-                at path = "…"
+            "#]],
+        );
+    }
+
+    #[test]
+    fn complete_attribute_on_fn() {
+        check(
+            r#"#[$0] fn main() {}"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+                at deprecated
+                at doc = "…"
+                at doc(hidden)
+                at doc(alias = "…")
+                at must_use
+                at no_mangle
+                at export_name = "…"
+                at link_name = "…"
+                at link_section = "…"
+                at cold
+                at ignore = "…"
+                at inline
+                at must_use
+                at panic_handler
                 at proc_macro
-                at proc_macro_attribute
                 at proc_macro_derive(…)
-                at repr(…)
+                at proc_macro_attribute
                 at should_panic
                 at target_feature = "…"
                 at test
                 at track_caller
-                at used
-                at warn(…)
             "#]],
-        )
+        );
     }
 
     #[test]
-    fn test_attribute_completion_inside_nested_attr() {
-        check(r#"#[cfg($0)]"#, expect![[]])
+    fn complete_attribute_on_expr() {
+        check(
+            r#"fn main() { #[$0] foo() }"#,
+            expect![[r#"
+                at allow(…)
+                at cfg(…)
+                at cfg_attr(…)
+                at deny(…)
+                at forbid(…)
+                at warn(…)
+            "#]],
+        );
     }
 
     #[test]
-    fn test_inner_attribute_completion() {
+    fn complete_attribute_in_source_file_end() {
         check(
-            r"#![$0]",
+            r#"#[$0]"#,
             expect![[r#"
                 at allow(…)
                 at automatically_derived
-                at cfg_attr(…)
                 at cfg(…)
+                at cfg_attr(…)
                 at cold
-                at crate_name = ""
                 at deny(…)
                 at deprecated
                 at derive(…)
-                at export_name = "…"
-                at doc(alias = "…")
                 at doc = "…"
+                at doc(alias = "…")
                 at doc(hidden)
-                at feature(…)
+                at export_name = "…"
                 at forbid(…)
                 at global_allocator
                 at ignore = "…"
@@ -538,27 +814,20 @@ struct Test {}
                 at macro_export
                 at macro_use
                 at must_use
-                at no_link
-                at no_implicit_prelude
-                at no_main
                 at no_mangle
-                at no_std
                 at non_exhaustive
                 at panic_handler
                 at path = "…"
                 at proc_macro
                 at proc_macro_attribute
                 at proc_macro_derive(…)
-                at recursion_limit = …
                 at repr(…)
                 at should_panic
                 at target_feature = "…"
                 at test
                 at track_caller
-                at type_length_limit = …
                 at used
                 at warn(…)
-                at windows_subsystem = "…"
             "#]],
         );
     }
diff --git a/crates/ide_completion/src/completions/attribute/derive.rs b/crates/ide_completion/src/completions/attribute/derive.rs
new file mode 100644
index 000000000..0bc3eab98
--- /dev/null
+++ b/crates/ide_completion/src/completions/attribute/derive.rs
@@ -0,0 +1,147 @@
+//! Completion for derives
+use itertools::Itertools;
+use rustc_hash::FxHashSet;
+use syntax::ast;
+
+use crate::{
+    context::CompletionContext,
+    item::{CompletionItem, CompletionItemKind, CompletionKind},
+    Completions,
+};
+
+pub(super) fn complete_derive(
+    acc: &mut Completions,
+    ctx: &CompletionContext,
+    derive_input: ast::TokenTree,
+) {
+    if let Some(existing_derives) = super::parse_comma_sep_input(derive_input) {
+        for derive_completion in DEFAULT_DERIVE_COMPLETIONS
+            .iter()
+            .filter(|completion| !existing_derives.contains(completion.label))
+        {
+            let mut components = vec![derive_completion.label];
+            components.extend(
+                derive_completion
+                    .dependencies
+                    .iter()
+                    .filter(|&&dependency| !existing_derives.contains(dependency)),
+            );
+            let lookup = components.join(", ");
+            let label = components.iter().rev().join(", ");
+            let mut item =
+                CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), label);
+            item.lookup_by(lookup).kind(CompletionItemKind::Attribute);
+            item.add_to(acc);
+        }
+
+        for custom_derive_name in get_derive_names_in_scope(ctx).difference(&existing_derives) {
+            let mut item = CompletionItem::new(
+                CompletionKind::Attribute,
+                ctx.source_range(),
+                custom_derive_name,
+            );
+            item.kind(CompletionItemKind::Attribute);
+            item.add_to(acc);
+        }
+    }
+}
+
+fn get_derive_names_in_scope(ctx: &CompletionContext) -> FxHashSet<String> {
+    let mut result = FxHashSet::default();
+    ctx.scope.process_all_names(&mut |name, scope_def| {
+        if let hir::ScopeDef::MacroDef(mac) = scope_def {
+            if mac.kind() == hir::MacroKind::Derive {
+                result.insert(name.to_string());
+            }
+        }
+    });
+    result
+}
+
+struct DeriveCompletion {
+    label: &'static str,
+    dependencies: &'static [&'static str],
+}
+
+/// Standard Rust derives and the information about their dependencies
+/// (the dependencies are needed so that the main derive don't break the compilation when added)
+const DEFAULT_DERIVE_COMPLETIONS: &[DeriveCompletion] = &[
+    DeriveCompletion { label: "Clone", dependencies: &[] },
+    DeriveCompletion { label: "Copy", dependencies: &["Clone"] },
+    DeriveCompletion { label: "Debug", dependencies: &[] },
+    DeriveCompletion { label: "Default", dependencies: &[] },
+    DeriveCompletion { label: "Hash", dependencies: &[] },
+    DeriveCompletion { label: "PartialEq", dependencies: &[] },
+    DeriveCompletion { label: "Eq", dependencies: &["PartialEq"] },
+    DeriveCompletion { label: "PartialOrd", dependencies: &["PartialEq"] },
+    DeriveCompletion { label: "Ord", dependencies: &["PartialOrd", "Eq", "PartialEq"] },
+];
+
+#[cfg(test)]
+mod tests {
+    use expect_test::{expect, Expect};
+
+    use crate::{test_utils::completion_list, CompletionKind};
+
+    fn check(ra_fixture: &str, expect: Expect) {
+        let actual = completion_list(ra_fixture, CompletionKind::Attribute);
+        expect.assert_eq(&actual);
+    }
+
+    #[test]
+    fn no_completion_for_incorrect_derive() {
+        check(r#"#[derive{$0)] struct Test;"#, expect![[]])
+    }
+
+    #[test]
+    fn empty_derive() {
+        check(
+            r#"#[derive($0)] struct Test;"#,
+            expect![[r#"
+                at Clone
+                at Clone, Copy
+                at Debug
+                at Default
+                at Hash
+                at PartialEq
+                at PartialEq, Eq
+                at PartialEq, PartialOrd
+                at PartialEq, Eq, PartialOrd, Ord
+            "#]],
+        );
+    }
+
+    #[test]
+    fn derive_with_input() {
+        check(
+            r#"#[derive(serde::Serialize, PartialEq, $0)] struct Test;"#,
+            expect![[r#"
+                at Clone
+                at Clone, Copy
+                at Debug
+                at Default
+                at Hash
+                at Eq
+                at PartialOrd
+                at Eq, PartialOrd, Ord
+            "#]],
+        )
+    }
+
+    #[test]
+    fn derive_with_input2() {
+        check(
+            r#"#[derive($0 serde::Serialize, PartialEq)] struct Test;"#,
+            expect![[r#"
+                at Clone
+                at Clone, Copy
+                at Debug
+                at Default
+                at Hash
+                at Eq
+                at PartialOrd
+                at Eq, PartialOrd, Ord
+            "#]],
+        )
+    }
+}
diff --git a/crates/ide_completion/src/completions/attribute/lint.rs b/crates/ide_completion/src/completions/attribute/lint.rs
new file mode 100644
index 000000000..403630dce
--- /dev/null
+++ b/crates/ide_completion/src/completions/attribute/lint.rs
@@ -0,0 +1,187 @@
+//! Completion for lints
+use syntax::ast;
+
+use crate::{
+    context::CompletionContext,
+    item::{CompletionItem, CompletionItemKind, CompletionKind},
+    Completions,
+};
+
+pub(super) fn complete_lint(
+    acc: &mut Completions,
+    ctx: &CompletionContext,
+    derive_input: ast::TokenTree,
+    lints_completions: &[LintCompletion],
+) {
+    if let Some(existing_lints) = super::parse_comma_sep_input(derive_input) {
+        for lint_completion in lints_completions
+            .into_iter()
+            .filter(|completion| !existing_lints.contains(completion.label))
+        {
+            let mut item = CompletionItem::new(
+                CompletionKind::Attribute,
+                ctx.source_range(),
+                lint_completion.label,
+            );
+            item.kind(CompletionItemKind::Attribute).detail(lint_completion.description);
+            item.add_to(acc)
+        }
+    }
+}
+
+pub(crate) struct LintCompletion {
+    pub(crate) label: &'static str,
+    pub(crate) description: &'static str,
+}
+
+#[rustfmt::skip]
+pub(super) const DEFAULT_LINT_COMPLETIONS: &[LintCompletion] = &[
+    LintCompletion { label: "absolute_paths_not_starting_with_crate", description: r#"fully qualified paths that start with a module name instead of `crate`, `self`, or an extern crate name"# },
+    LintCompletion { label: "anonymous_parameters", description: r#"detects anonymous parameters"# },
+    LintCompletion { label: "box_pointers", description: r#"use of owned (Box type) heap memory"# },
+    LintCompletion { label: "deprecated_in_future", description: r#"detects use of items that will be deprecated in a future version"# },
+    LintCompletion { label: "elided_lifetimes_in_paths", description: r#"hidden lifetime parameters in types are deprecated"# },
+    LintCompletion { label: "explicit_outlives_requirements", description: r#"outlives requirements can be inferred"# },
+    LintCompletion { label: "indirect_structural_match", description: r#"pattern with const indirectly referencing non-structural-match type"# },
+    LintCompletion { label: "keyword_idents", description: r#"detects edition keywords being used as an identifier"# },
+    LintCompletion { label: "macro_use_extern_crate", description: r#"the `#[macro_use]` attribute is now deprecated in favor of using macros via the module system"# },
+    LintCompletion { label: "meta_variable_misuse", description: r#"possible meta-variable misuse at macro definition"# },
+    LintCompletion { label: "missing_copy_implementations", description: r#"detects potentially-forgotten implementations of `Copy`"# },
+    LintCompletion { label: "missing_crate_level_docs", description: r#"detects crates with no crate-level documentation"# },
+    LintCompletion { label: "missing_debug_implementations", description: r#"detects missing implementations of Debug"# },
+    LintCompletion { label: "missing_docs", description: r#"detects missing documentation for public members"# },
+    LintCompletion { label: "missing_doc_code_examples", description: r#"detects publicly-exported items without code samples in their documentation"# },
+    LintCompletion { label: "non_ascii_idents", description: r#"detects non-ASCII identifiers"# },
+    LintCompletion { label: "private_doc_tests", description: r#"detects code samples in docs of private items not documented by rustdoc"# },
+    LintCompletion { label: "single_use_lifetimes", description: r#"detects lifetime parameters that are only used once"# },
+    LintCompletion { label: "trivial_casts", description: r#"detects trivial casts which could be removed"# },
+    LintCompletion { label: "trivial_numeric_casts", description: r#"detects trivial casts of numeric types which could be removed"# },
+    LintCompletion { label: "unaligned_references", description: r#"detects unaligned references to fields of packed structs"# },
+    LintCompletion { label: "unreachable_pub", description: r#"`pub` items not reachable from crate root"# },
+    LintCompletion { label: "unsafe_code", description: r#"usage of `unsafe` code"# },
+    LintCompletion { label: "unsafe_op_in_unsafe_fn", description: r#"unsafe operations in unsafe functions without an explicit unsafe block are deprecated"# },
+    LintCompletion { label: "unstable_features", description: r#"enabling unstable features (deprecated. do not use)"# },
+    LintCompletion { label: "unused_crate_dependencies", description: r#"crate dependencies that are never used"# },
+    LintCompletion { label: "unused_extern_crates", description: r#"extern crates that are never used"# },
+    LintCompletion { label: "unused_import_braces", description: r#"unnecessary braces around an imported item"# },
+    LintCompletion { label: "unused_lifetimes", description: r#"detects lifetime parameters that are never used"# },
+    LintCompletion { label: "unused_qualifications", description: r#"detects unnecessarily qualified names"# },
+    LintCompletion { label: "unused_results", description: r#"unused result of an expression in a statement"# },
+    LintCompletion { label: "variant_size_differences", description: r#"detects enums with widely varying variant sizes"# },
+    LintCompletion { label: "array_into_iter", description: r#"detects calling `into_iter` on arrays"# },
+    LintCompletion { label: "asm_sub_register", description: r#"using only a subset of a register for inline asm inputs"# },
+    LintCompletion { label: "bare_trait_objects", description: r#"suggest using `dyn Trait` for trait objects"# },
+    LintCompletion { label: "bindings_with_variant_name", description: r#"detects pattern bindings with the same name as one of the matched variants"# },
+    LintCompletion { label: "cenum_impl_drop_cast", description: r#"a C-like enum implementing Drop is cast"# },
+    LintCompletion { label: "clashing_extern_declarations", description: r#"detects when an extern fn has been declared with the same name but different types"# },
+    LintCompletion { label: "coherence_leak_check", description: r#"distinct impls distinguished only by the leak-check code"# },
+    LintCompletion { label: "confusable_idents", description: r#"detects visually confusable pairs between identifiers"# },
+    LintCompletion { label: "dead_code", description: r#"detect unused, unexported items"# },
+    LintCompletion { label: "deprecated", description: r#"detects use of deprecated items"# },
+    LintCompletion { label: "ellipsis_inclusive_range_patterns", description: r#"`...` range patterns are deprecated"# },
+    LintCompletion { label: "exported_private_dependencies", description: r#"public interface leaks type from a private dependency"# },
+    LintCompletion { label: "illegal_floating_point_literal_pattern", description: r#"floating-point literals cannot be used in patterns"# },
+    LintCompletion { label: "improper_ctypes", description: r#"proper use of libc types in foreign modules"# },
+    LintCompletion { label: "improper_ctypes_definitions", description: r#"proper use of libc types in foreign item definitions"# },
+    LintCompletion { label: "incomplete_features", description: r#"incomplete features that may function improperly in some or all cases"# },
+    LintCompletion { label: "inline_no_sanitize", description: r#"detects incompatible use of `#[inline(always)]` and `#[no_sanitize(...)]`"# },
+    LintCompletion { label: "intra_doc_link_resolution_failure", description: r#"failures in resolving intra-doc link targets"# },
+    LintCompletion { label: "invalid_codeblock_attributes", description: r#"codeblock attribute looks a lot like a known one"# },
+    LintCompletion { label: "invalid_value", description: r#"an invalid value is being created (such as a NULL reference)"# },
+    LintCompletion { label: "irrefutable_let_patterns", description: r#"detects irrefutable patterns in if-let and while-let statements"# },
+    LintCompletion { label: "late_bound_lifetime_arguments", description: r#"detects generic lifetime arguments in path segments with late bound lifetime parameters"# },
+    LintCompletion { label: "mixed_script_confusables", description: r#"detects Unicode scripts whose mixed script confusables codepoints are solely used"# },
+    LintCompletion { label: "mutable_borrow_reservation_conflict", description: r#"reservation of a two-phased borrow conflicts with other shared borrows"# },
+    LintCompletion { label: "non_camel_case_types", description: r#"types, variants, traits and type parameters should have camel case names"# },
+    LintCompletion { label: "non_shorthand_field_patterns", description: r#"using `Struct { x: x }` instead of `Struct { x }` in a pattern"# },
+    LintCompletion { label: "non_snake_case", description: r#"variables, methods, functions, lifetime parameters and modules should have snake case names"# },
+    LintCompletion { label: "non_upper_case_globals", description: r#"static constants should have uppercase identifiers"# },
+    LintCompletion { label: "no_mangle_generic_items", description: r#"generic items must be mangled"# },
+    LintCompletion { label: "overlapping_patterns", description: r#"detects overlapping patterns"# },
+    LintCompletion { label: "path_statements", description: r#"path statements with no effect"# },
+    LintCompletion { label: "private_in_public", description: r#"detect private items in public interfaces not caught by the old implementation"# },
+    LintCompletion { label: "proc_macro_derive_resolution_fallback", description: r#"detects proc macro derives using inaccessible names from parent modules"# },
+    LintCompletion { label: "redundant_semicolons", description: r#"detects unnecessary trailing semicolons"# },
+    LintCompletion { label: "renamed_and_removed_lints", description: r#"lints that have been renamed or removed"# },
+    LintCompletion { label: "safe_packed_borrows", description: r#"safe borrows of fields of packed structs were erroneously allowed"# },
+    LintCompletion { label: "stable_features", description: r#"stable features found in `#[feature]` directive"# },
+    LintCompletion { label: "trivial_bounds", description: r#"these bounds don't depend on an type parameters"# },
+    LintCompletion { label: "type_alias_bounds", description: r#"bounds in type aliases are not enforced"# },
+    LintCompletion { label: "tyvar_behind_raw_pointer", description: r#"raw pointer to an inference variable"# },
+    LintCompletion { label: "uncommon_codepoints", description: r#"detects uncommon Unicode codepoints in identifiers"# },
+    LintCompletion { label: "unconditional_recursion", description: r#"functions that cannot return without calling themselves"# },
+    LintCompletion { label: "unknown_lints", description: r#"unrecognized lint attribute"# },
+    LintCompletion { label: "unnameable_test_items", description: r#"detects an item that cannot be named being marked as `#[test_case]`"# },
+    LintCompletion { label: "unreachable_code", description: r#"detects unreachable code paths"# },
+    LintCompletion { label: "unreachable_patterns", description: r#"detects unreachable patterns"# },
+    LintCompletion { label: "unstable_name_collisions", description: r#"detects name collision with an existing but unstable method"# },
+    LintCompletion { label: "unused_allocation", description: r#"detects unnecessary allocations that can be eliminated"# },
+    LintCompletion { label: "unused_assignments", description: r#"detect assignments that will never be read"# },
+    LintCompletion { label: "unused_attributes", description: r#"detects attributes that were not used by the compiler"# },
+    LintCompletion { label: "unused_braces", description: r#"unnecessary braces around an expression"# },
+    LintCompletion { label: "unused_comparisons", description: r#"comparisons made useless by limits of the types involved"# },
+    LintCompletion { label: "unused_doc_comments", description: r#"detects doc comments that aren't used by rustdoc"# },
+    LintCompletion { label: "unused_features", description: r#"unused features found in crate-level `#[feature]` directives"# },
+    LintCompletion { label: "unused_imports", description: r#"imports that are never used"# },
+    LintCompletion { label: "unused_labels", description: r#"detects labels that are never used"# },
+    LintCompletion { label: "unused_macros", description: r#"detects macros that were not used"# },
+    LintCompletion { label: "unused_must_use", description: r#"unused result of a type flagged as `#[must_use]`"# },
+    LintCompletion { label: "unused_mut", description: r#"detect mut variables which don't need to be mutable"# },
+    LintCompletion { label: "unused_parens", description: r#"`if`, `match`, `while` and `return` do not need parentheses"# },
+    LintCompletion { label: "unused_unsafe", description: r#"unnecessary use of an `unsafe` block"# },
+    LintCompletion { label: "unused_variables", description: r#"detect variables which are not used in any way"# },
+    LintCompletion { label: "warnings", description: r#"mass-change the level for lints which produce warnings"# },
+    LintCompletion { label: "where_clauses_object_safety", description: r#"checks the object safety of where clauses"# },
+    LintCompletion { label: "while_true", description: r#"suggest using `loop { }` instead of `while true { }`"# },
+    LintCompletion { label: "ambiguous_associated_items", description: r#"ambiguous associated items"# },
+    LintCompletion { label: "arithmetic_overflow", description: r#"arithmetic operation overflows"# },
+    LintCompletion { label: "conflicting_repr_hints", description: r#"conflicts between `#[repr(..)]` hints that were previously accepted and used in practice"# },
+    LintCompletion { label: "const_err", description: r#"constant evaluation detected erroneous expression"# },
+    LintCompletion { label: "ill_formed_attribute_input", description: r#"ill-formed attribute inputs that were previously accepted and used in practice"# },
+    LintCompletion { label: "incomplete_include", description: r#"trailing content in included file"# },
+    LintCompletion { label: "invalid_type_param_default", description: r#"type parameter default erroneously allowed in invalid location"# },
+    LintCompletion { label: "macro_expanded_macro_exports_accessed_by_absolute_paths", description: r#"macro-expanded `macro_export` macros from the current crate cannot be referred to by absolute paths"# },
+    LintCompletion { label: "missing_fragment_specifier", description: r#"detects missing fragment specifiers in unused `macro_rules!` patterns"# },
+    LintCompletion { label: "mutable_transmutes", description: r#"mutating transmuted &mut T from &T may cause undefined behavior"# },
+    LintCompletion { label: "no_mangle_const_items", description: r#"const items will not have their symbols exported"# },
+    LintCompletion { label: "order_dependent_trait_objects", description: r#"trait-object types were treated as different depending on marker-trait order"# },
+    LintCompletion { label: "overflowing_literals", description: r#"literal out of range for its type"# },
+    LintCompletion { label: "patterns_in_fns_without_body", description: r#"patterns in functions without body were erroneously allowed"# },
+    LintCompletion { label: "pub_use_of_private_extern_crate", description: r#"detect public re-exports of private extern crates"# },
+    LintCompletion { label: "soft_unstable", description: r#"a feature gate that doesn't break dependent crates"# },
+    LintCompletion { label: "unconditional_panic", description: r#"operation will cause a panic at runtime"# },
+    LintCompletion { label: "unknown_crate_types", description: r#"unknown crate type found in `#[crate_type]` directive"# },
+];
+
+#[cfg(test)]
+mod tests {
+
+    use crate::test_utils::check_edit;
+
+    #[test]
+    fn check_empty() {
+        check_edit(
+            "deprecated",
+            r#"#[allow($0)] struct Test;"#,
+            r#"#[allow(deprecated)] struct Test;"#,
+        )
+    }
+
+    #[test]
+    fn check_with_existing() {
+        check_edit(
+            "deprecated",
+            r#"#[allow(keyword_idents, $0)] struct Test;"#,
+            r#"#[allow(keyword_idents, deprecated)] struct Test;"#,
+        )
+    }
+
+    #[test]
+    fn check_qualified() {
+        check_edit(
+            "deprecated",
+            r#"#[allow(keyword_idents, $0)] struct Test;"#,
+            r#"#[allow(keyword_idents, deprecated)] struct Test;"#,
+        )
+    }
+}
diff --git a/crates/ide_completion/src/completions/dot.rs b/crates/ide_completion/src/completions/dot.rs
index fd9738743..302c9ccbd 100644
--- a/crates/ide_completion/src/completions/dot.rs
+++ b/crates/ide_completion/src/completions/dot.rs
@@ -1,6 +1,7 @@
 //! Completes references after dot (fields and method calls).
 
-use hir::{HasVisibility, Type};
+use either::Either;
+use hir::{HasVisibility, ScopeDef};
 use rustc_hash::FxHashSet;
 
 use crate::{context::CompletionContext, Completions};
@@ -9,7 +10,7 @@ use crate::{context::CompletionContext, Completions};
 pub(crate) fn complete_dot(acc: &mut Completions, ctx: &CompletionContext) {
     let dot_receiver = match &ctx.dot_receiver {
         Some(expr) => expr,
-        _ => return,
+        _ => return complete_undotted_self(acc, ctx),
     };
 
     let receiver_ty = match ctx.sema.type_of_expr(&dot_receiver) {
@@ -20,12 +21,43 @@ pub(crate) fn complete_dot(acc: &mut Completions, ctx: &CompletionContext) {
     if ctx.is_call {
         cov_mark::hit!(test_no_struct_field_completion_for_method_call);
     } else {
-        complete_fields(acc, ctx, &receiver_ty);
+        complete_fields(ctx, &receiver_ty, |field, ty| match field {
+            Either::Left(field) => acc.add_field(ctx, None, field, &ty),
+            Either::Right(tuple_idx) => acc.add_tuple_field(ctx, None, tuple_idx, &ty),
+        });
     }
-    complete_methods(acc, ctx, &receiver_ty);
+    complete_methods(ctx, &receiver_ty, |func| acc.add_method(ctx, func, None, None));
+}
+
+fn complete_undotted_self(acc: &mut Completions, ctx: &CompletionContext) {
+    if !ctx.is_trivial_path || !ctx.config.enable_self_on_the_fly {
+        return;
+    }
+    ctx.scope.process_all_names(&mut |name, def| {
+        if let ScopeDef::Local(local) = &def {
+            if local.is_self(ctx.db) {
+                let ty = local.ty(ctx.db);
+                complete_fields(ctx, &ty, |field, ty| match field {
+                    either::Either::Left(field) => {
+                        acc.add_field(ctx, Some(name.clone()), field, &ty)
+                    }
+                    either::Either::Right(tuple_idx) => {
+                        acc.add_tuple_field(ctx, Some(name.clone()), tuple_idx, &ty)
+                    }
+                });
+                complete_methods(ctx, &ty, |func| {
+                    acc.add_method(ctx, func, Some(name.clone()), None)
+                });
+            }
+        }
+    });
 }
 
-fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: &Type) {
+fn complete_fields(
+    ctx: &CompletionContext,
+    receiver: &hir::Type,
+    mut f: impl FnMut(Either<hir::Field, usize>, hir::Type),
+) {
     for receiver in receiver.autoderef(ctx.db) {
         for (field, ty) in receiver.fields(ctx.db) {
             if ctx.scope.module().map_or(false, |m| !field.is_visible_from(ctx.db, m)) {
@@ -33,16 +65,20 @@ fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: &Ty
                 // field is editable, we should show the completion
                 continue;
             }
-            acc.add_field(ctx, field, &ty);
+            f(Either::Left(field), ty);
         }
         for (i, ty) in receiver.tuple_fields(ctx.db).into_iter().enumerate() {
             // FIXME: Handle visibility
-            acc.add_tuple_field(ctx, i, &ty);
+            f(Either::Right(i), ty);
         }
     }
 }
 
-fn complete_methods(acc: &mut Completions, ctx: &CompletionContext, receiver: &Type) {
+fn complete_methods(
+    ctx: &CompletionContext,
+    receiver: &hir::Type,
+    mut f: impl FnMut(hir::Function),
+) {
     if let Some(krate) = ctx.krate {
         let mut seen_methods = FxHashSet::default();
         let traits_in_scope = ctx.scope.traits_in_scope();
@@ -51,7 +87,7 @@ fn complete_methods(acc: &mut Completions, ctx: &CompletionContext, receiver: &T
                 && ctx.scope.module().map_or(true, |m| func.is_visible_from(ctx.db, m))
                 && seen_methods.insert(func.name(ctx.db))
             {
-                acc.add_method(ctx, func, None);
+                f(func);
             }
             None::<()>
         });
@@ -484,4 +520,34 @@ impl S {
             "#]],
         );
     }
+
+    #[test]
+    fn completes_bare_fields_and_methods_in_methods() {
+        check(
+            r#"
+struct Foo { field: i32 }
+
+impl Foo { fn foo(&self) { $0 } }"#,
+            expect![[r#"
+                lc self       &Foo
+                sp Self
+                st Foo
+                fd self.field i32
+                me self.foo() fn(&self)
+            "#]],
+        );
+        check(
+            r#"
+struct Foo(i32);
+
+impl Foo { fn foo(&mut self) { $0 } }"#,
+            expect![[r#"
+                lc self       &mut Foo
+                sp Self
+                st Foo
+                fd self.0     i32
+                me self.foo() fn(&mut self)
+            "#]],
+        );
+    }
 }
diff --git a/crates/ide_completion/src/completions/flyimport.rs b/crates/ide_completion/src/completions/flyimport.rs
index 9d5b61562..df27e7a84 100644
--- a/crates/ide_completion/src/completions/flyimport.rs
+++ b/crates/ide_completion/src/completions/flyimport.rs
@@ -111,11 +111,9 @@ pub(crate) fn import_on_the_fly(acc: &mut Completions, ctx: &CompletionContext)
         return None;
     }
     if ctx.use_item_syntax.is_some()
-        || ctx.attribute_under_caret.is_some()
-        || ctx.mod_declaration_under_caret.is_some()
-        || ctx.record_lit_syntax.is_some()
-        || ctx.has_trait_parent
-        || ctx.has_impl_parent
+        || ctx.is_path_disallowed()
+        || ctx.expects_item()
+        || ctx.expects_assoc_item()
     {
         return None;
     }
diff --git a/crates/ide_completion/src/completions/fn_param.rs b/crates/ide_completion/src/completions/fn_param.rs
index 0ea558489..cb90e8a3e 100644
--- a/crates/ide_completion/src/completions/fn_param.rs
+++ b/crates/ide_completion/src/completions/fn_param.rs
@@ -128,4 +128,19 @@ fn outer(text: String) {
             "#]],
         )
     }
+
+    #[test]
+    fn completes_non_ident_pat_param() {
+        check(
+            r#"
+struct Bar { bar: u32 }
+
+fn foo(Bar { bar }: Bar) {}
+fn foo2($0) {}
+"#,
+            expect![[r#"
+                bn Bar { bar }: Bar
+            "#]],
+        )
+    }
 }
diff --git a/crates/ide_completion/src/completions/keyword.rs b/crates/ide_completion/src/completions/keyword.rs
index 61b667104..0d035c611 100644
--- a/crates/ide_completion/src/completions/keyword.rs
+++ b/crates/ide_completion/src/completions/keyword.rs
@@ -2,9 +2,12 @@
 
 use std::iter;
 
-use syntax::SyntaxKind;
+use syntax::{SyntaxKind, T};
 
-use crate::{CompletionContext, CompletionItem, CompletionItemKind, CompletionKind, Completions};
+use crate::{
+    patterns::ImmediateLocation, CompletionContext, CompletionItem, CompletionItemKind,
+    CompletionKind, Completions,
+};
 
 pub(crate) fn complete_use_tree_keyword(acc: &mut Completions, ctx: &CompletionContext) {
     // complete keyword "crate" in use stmt
@@ -44,111 +47,105 @@ pub(crate) fn complete_expr_keyword(acc: &mut Completions, ctx: &CompletionConte
         cov_mark::hit!(no_keyword_completion_in_comments);
         return;
     }
-    if ctx.record_lit_syntax.is_some() {
+    if matches!(ctx.completion_location, Some(ImmediateLocation::RecordExpr(_))) {
         cov_mark::hit!(no_keyword_completion_in_record_lit);
         return;
     }
+    let mut add_keyword = |kw, snippet| add_keyword(ctx, acc, kw, snippet);
 
-    let has_trait_or_impl_parent = ctx.has_impl_parent || ctx.has_trait_parent;
-    if ctx.trait_as_prev_sibling || ctx.impl_as_prev_sibling {
-        add_keyword(ctx, acc, "where", "where ");
+    let expects_assoc_item = ctx.expects_assoc_item();
+    let has_block_expr_parent = ctx.has_block_expr_parent();
+    let expects_item = ctx.expects_item();
+
+    if ctx.has_impl_or_trait_prev_sibling() {
+        add_keyword("where", "where ");
         return;
     }
-    if ctx.unsafe_is_prev {
-        if ctx.has_item_list_or_source_file_parent || ctx.block_expr_parent {
-            add_keyword(ctx, acc, "fn", "fn $0() {}")
+    if ctx.previous_token_is(T![unsafe]) {
+        if expects_item || expects_assoc_item || has_block_expr_parent {
+            add_keyword("fn", "fn $1($2) {\n    $0\n}")
         }
 
-        if (ctx.has_item_list_or_source_file_parent) || ctx.block_expr_parent {
-            add_keyword(ctx, acc, "trait", "trait $0 {}");
-            add_keyword(ctx, acc, "impl", "impl $0 {}");
+        if expects_item || has_block_expr_parent {
+            add_keyword("trait", "trait $1 {\n    $0\n}");
+            add_keyword("impl", "impl $1 {\n    $0\n}");
         }
 
         return;
     }
-    if ctx.has_item_list_or_source_file_parent || has_trait_or_impl_parent || ctx.block_expr_parent
-    {
-        add_keyword(ctx, acc, "fn", "fn $0() {}");
-    }
-    if (ctx.has_item_list_or_source_file_parent) || ctx.block_expr_parent {
-        add_keyword(ctx, acc, "use", "use ");
-        add_keyword(ctx, acc, "impl", "impl $0 {}");
-        add_keyword(ctx, acc, "trait", "trait $0 {}");
-    }
 
-    if ctx.has_item_list_or_source_file_parent {
-        add_keyword(ctx, acc, "enum", "enum $0 {}");
-        add_keyword(ctx, acc, "struct", "struct $0");
-        add_keyword(ctx, acc, "union", "union $0 {}");
+    if expects_item || ctx.expects_non_trait_assoc_item() || ctx.expect_record_field() {
+        add_keyword("pub(crate)", "pub(crate) ");
+        add_keyword("pub", "pub ");
     }
 
-    if ctx.is_expr {
-        add_keyword(ctx, acc, "match", "match $0 {}");
-        add_keyword(ctx, acc, "while", "while $0 {}");
-        add_keyword(ctx, acc, "while let", "while let $1 = $0 {}");
-        add_keyword(ctx, acc, "loop", "loop {$0}");
-        add_keyword(ctx, acc, "if", "if $0 {}");
-        add_keyword(ctx, acc, "if let", "if let $1 = $0 {}");
-        add_keyword(ctx, acc, "for", "for $1 in $0 {}");
+    if expects_item || expects_assoc_item || has_block_expr_parent {
+        add_keyword("unsafe", "unsafe ");
+        add_keyword("fn", "fn $1($2) {\n    $0\n}");
+        add_keyword("const", "const $0");
+        add_keyword("type", "type $0");
     }
 
-    if ctx.if_is_prev || ctx.block_expr_parent {
-        add_keyword(ctx, acc, "let", "let ");
+    if expects_item || has_block_expr_parent {
+        add_keyword("use", "use $0");
+        add_keyword("impl", "impl $1 {\n    $0\n}");
+        add_keyword("trait", "trait $1 {\n    $0\n}");
+        add_keyword("static", "static $0");
+        add_keyword("extern", "extern $0");
+        add_keyword("mod", "mod $0");
     }
 
-    if ctx.after_if {
-        add_keyword(ctx, acc, "else", "else {$0}");
-        add_keyword(ctx, acc, "else if", "else if $0 {}");
-    }
-    if (ctx.has_item_list_or_source_file_parent) || ctx.block_expr_parent {
-        add_keyword(ctx, acc, "mod", "mod $0");
+    if expects_item {
+        add_keyword("enum", "enum $1 {\n    $0\n}");
+        add_keyword("struct", "struct $0");
+        add_keyword("union", "union $1 {\n    $0\n}");
     }
-    if ctx.bind_pat_parent || ctx.ref_pat_parent {
-        add_keyword(ctx, acc, "mut", "mut ");
+
+    if ctx.expects_expression() {
+        if !has_block_expr_parent {
+            add_keyword("unsafe", "unsafe {\n    $0\n}");
+        }
+        add_keyword("match", "match $1 {\n    $0\n}");
+        add_keyword("while", "while $1 {\n    $0\n}");
+        add_keyword("while let", "while let $1 = $2 {\n    $0\n}");
+        add_keyword("loop", "loop {\n    $0\n}");
+        add_keyword("if", "if $1 {\n    $0\n}");
+        add_keyword("if let", "if let $1 = $2 {\n    $0\n}");
+        add_keyword("for", "for $1 in $2 {\n    $0\n}");
     }
-    if ctx.has_item_list_or_source_file_parent || has_trait_or_impl_parent || ctx.block_expr_parent
-    {
-        add_keyword(ctx, acc, "const", "const ");
-        add_keyword(ctx, acc, "type", "type ");
+
+    if ctx.previous_token_is(T![if]) || ctx.previous_token_is(T![while]) || has_block_expr_parent {
+        add_keyword("let", "let ");
     }
-    if (ctx.has_item_list_or_source_file_parent) || ctx.block_expr_parent {
-        add_keyword(ctx, acc, "static", "static ");
-    };
-    if (ctx.has_item_list_or_source_file_parent) || ctx.block_expr_parent {
-        add_keyword(ctx, acc, "extern", "extern ");
+
+    if ctx.after_if() {
+        add_keyword("else", "else {\n    $0\n}");
+        add_keyword("else if", "else if $1 {\n    $0\n}");
     }
-    if ctx.has_item_list_or_source_file_parent
-        || has_trait_or_impl_parent
-        || ctx.block_expr_parent
-        || ctx.is_match_arm
-    {
-        add_keyword(ctx, acc, "unsafe", "unsafe ");
+
+    if ctx.expects_ident_pat_or_ref_expr() {
+        add_keyword("mut", "mut ");
     }
+
     if ctx.in_loop_body {
         if ctx.can_be_stmt {
-            add_keyword(ctx, acc, "continue", "continue;");
-            add_keyword(ctx, acc, "break", "break;");
+            add_keyword("continue", "continue;");
+            add_keyword("break", "break;");
         } else {
-            add_keyword(ctx, acc, "continue", "continue");
-            add_keyword(ctx, acc, "break", "break");
+            add_keyword("continue", "continue");
+            add_keyword("break", "break");
         }
     }
-    if ctx.has_item_list_or_source_file_parent || ctx.has_impl_parent | ctx.has_field_list_parent {
-        add_keyword(ctx, acc, "pub(crate)", "pub(crate) ");
-        add_keyword(ctx, acc, "pub", "pub ");
-    }
 
     if !ctx.is_trivial_path {
         return;
     }
-    let fn_def = match &ctx.function_syntax {
+    let fn_def = match &ctx.function_def {
         Some(it) => it,
         None => return,
     };
 
     add_keyword(
-        ctx,
-        acc,
         "return",
         match (ctx.can_be_stmt, fn_def.ret_type().is_some()) {
             (true, true) => "return $0;",
@@ -165,15 +162,12 @@ fn add_keyword(ctx: &CompletionContext, acc: &mut Completions, kw: &str, snippet
 
     match ctx.config.snippet_cap {
         Some(cap) => {
-            let tmp;
-            let snippet = if snippet.ends_with('}') && ctx.incomplete_let {
+            if snippet.ends_with('}') && ctx.incomplete_let {
                 cov_mark::hit!(let_semi);
-                tmp = format!("{};", snippet);
-                &tmp
+                item.insert_snippet(cap, format!("{};", snippet));
             } else {
-                snippet
-            };
-            item.insert_snippet(cap, snippet);
+                item.insert_snippet(cap, snippet);
+            }
         }
         None => {
             item.insert_text(if snippet.contains('$') { kw } else { snippet });
@@ -236,21 +230,21 @@ mod tests {
         check(
             r"m$0",
             expect![[r#"
+                kw pub(crate)
+                kw pub
+                kw unsafe
                 kw fn
+                kw const
+                kw type
                 kw use
                 kw impl
                 kw trait
+                kw static
+                kw extern
+                kw mod
                 kw enum
                 kw struct
                 kw union
-                kw mod
-                kw const
-                kw type
-                kw static
-                kw extern
-                kw unsafe
-                kw pub(crate)
-                kw pub
             "#]],
         );
     }
@@ -260,10 +254,16 @@ mod tests {
         check(
             r"fn quux() { $0 }",
             expect![[r#"
+                kw unsafe
                 kw fn
+                kw const
+                kw type
                 kw use
                 kw impl
                 kw trait
+                kw static
+                kw extern
+                kw mod
                 kw match
                 kw while
                 kw while let
@@ -272,12 +272,6 @@ mod tests {
                 kw if let
                 kw for
                 kw let
-                kw mod
-                kw const
-                kw type
-                kw static
-                kw extern
-                kw unsafe
                 kw return
             "#]],
         );
@@ -288,10 +282,16 @@ mod tests {
         check(
             r"fn quux() { if true { $0 } }",
             expect![[r#"
+                kw unsafe
                 kw fn
+                kw const
+                kw type
                 kw use
                 kw impl
                 kw trait
+                kw static
+                kw extern
+                kw mod
                 kw match
                 kw while
                 kw while let
@@ -300,12 +300,6 @@ mod tests {
                 kw if let
                 kw for
                 kw let
-                kw mod
-                kw const
-                kw type
-                kw static
-                kw extern
-                kw unsafe
                 kw return
             "#]],
         );
@@ -316,10 +310,16 @@ mod tests {
         check(
             r#"fn quux() { if true { () } $0 }"#,
             expect![[r#"
+                kw unsafe
                 kw fn
+                kw const
+                kw type
                 kw use
                 kw impl
                 kw trait
+                kw static
+                kw extern
+                kw mod
                 kw match
                 kw while
                 kw while let
@@ -330,19 +330,15 @@ mod tests {
                 kw let
                 kw else
                 kw else if
-                kw mod
-                kw const
-                kw type
-                kw static
-                kw extern
-                kw unsafe
                 kw return
             "#]],
         );
         check_edit(
             "else",
             r#"fn quux() { if true { () } $0 }"#,
-            r#"fn quux() { if true { () } else {$0} }"#,
+            r#"fn quux() { if true { () } else {
+    $0
+} }"#,
         );
     }
 
@@ -355,6 +351,7 @@ fn quux() -> i32 {
 }
 "#,
             expect![[r#"
+                kw unsafe
                 kw match
                 kw while
                 kw while let
@@ -362,7 +359,6 @@ fn quux() -> i32 {
                 kw if
                 kw if let
                 kw for
-                kw unsafe
                 kw return
             "#]],
         );
@@ -373,10 +369,10 @@ fn quux() -> i32 {
         check(
             r"trait My { $0 }",
             expect![[r#"
+                kw unsafe
                 kw fn
                 kw const
                 kw type
-                kw unsafe
             "#]],
         );
     }
@@ -386,12 +382,27 @@ fn quux() -> i32 {
         check(
             r"impl My { $0 }",
             expect![[r#"
+                kw pub(crate)
+                kw pub
+                kw unsafe
                 kw fn
                 kw const
                 kw type
-                kw unsafe
+            "#]],
+        );
+    }
+
+    #[test]
+    fn test_keywords_in_impl_def_with_attr() {
+        check(
+            r"impl My { #[foo] $0 }",
+            expect![[r#"
                 kw pub(crate)
                 kw pub
+                kw unsafe
+                kw fn
+                kw const
+                kw type
             "#]],
         );
     }
@@ -401,10 +412,16 @@ fn quux() -> i32 {
         check(
             r"fn my() { loop { $0 } }",
             expect![[r#"
+                kw unsafe
                 kw fn
+                kw const
+                kw type
                 kw use
                 kw impl
                 kw trait
+                kw static
+                kw extern
+                kw mod
                 kw match
                 kw while
                 kw while let
@@ -413,12 +430,6 @@ fn quux() -> i32 {
                 kw if let
                 kw for
                 kw let
-                kw mod
-                kw const
-                kw type
-                kw static
-                kw extern
-                kw unsafe
                 kw continue
                 kw break
                 kw return
@@ -565,6 +576,7 @@ pub mod future {
         check(
             r#"fn main() { let _ = $0 }"#,
             expect![[r#"
+                kw unsafe
                 kw match
                 kw while
                 kw while let
@@ -625,6 +637,7 @@ fn foo() {
 }
 "#,
             expect![[r#"
+                kw unsafe
                 kw match
                 kw while
                 kw while let
@@ -646,7 +659,9 @@ fn foo() {
 fn main() { let x = $0 }
 "#,
             r#"
-fn main() { let x = match $0 {}; }
+fn main() { let x = match $1 {
+    $0
+}; }
 "#,
         );
 
@@ -660,7 +675,9 @@ fn main() {
 "#,
             r#"
 fn main() {
-    let x = if $0 {};
+    let x = if $1 {
+    $0
+};
     let y = 92;
 }
 "#,
@@ -676,7 +693,9 @@ fn main() {
 "#,
             r#"
 fn main() {
-    let x = loop {$0};
+    let x = loop {
+    $0
+};
     bar();
 }
 "#,
diff --git a/crates/ide_completion/src/completions/lifetime.rs b/crates/ide_completion/src/completions/lifetime.rs
index 5eeddf7a4..8ccccb646 100644
--- a/crates/ide_completion/src/completions/lifetime.rs
+++ b/crates/ide_completion/src/completions/lifetime.rs
@@ -8,19 +8,23 @@ pub(crate) fn complete_lifetime(acc: &mut Completions, ctx: &CompletionContext)
     if !ctx.lifetime_allowed {
         return;
     }
+    let lp_string;
     let param_lifetime = match (
         &ctx.lifetime_syntax,
         ctx.lifetime_param_syntax.as_ref().and_then(|lp| lp.lifetime()),
     ) {
         (Some(lt), Some(lp)) if lp == lt.clone() => return,
-        (Some(_), Some(lp)) => Some(lp.to_string()),
+        (Some(_), Some(lp)) => {
+            lp_string = lp.to_string();
+            Some(&*lp_string)
+        }
         _ => None,
     };
 
     ctx.scope.process_all_names(&mut |name, res| {
         if let ScopeDef::GenericParam(hir::GenericParam::LifetimeParam(_)) = res {
-            if param_lifetime != Some(name.to_string()) {
-                acc.add_resolution(ctx, name.to_string(), &res);
+            if param_lifetime != Some(&*name.to_string()) {
+                acc.add_resolution(ctx, name, &res);
             }
         }
     });
@@ -36,7 +40,7 @@ pub(crate) fn complete_label(acc: &mut Completions, ctx: &CompletionContext) {
     }
     ctx.scope.process_all_names(&mut |name, res| {
         if let ScopeDef::Label(_) = res {
-            acc.add_resolution(ctx, name.to_string(), &res);
+            acc.add_resolution(ctx, name, &res);
         }
     });
 }
diff --git a/crates/ide_completion/src/completions/macro_in_item_position.rs b/crates/ide_completion/src/completions/macro_in_item_position.rs
index 2be299ac2..202e71215 100644
--- a/crates/ide_completion/src/completions/macro_in_item_position.rs
+++ b/crates/ide_completion/src/completions/macro_in_item_position.rs
@@ -2,15 +2,22 @@
 
 use crate::{CompletionContext, Completions};
 
+// Ideally this should be removed and moved into `(un)qualified_path` respectively
 pub(crate) fn complete_macro_in_item_position(acc: &mut Completions, ctx: &CompletionContext) {
     // Show only macros in top level.
-    if ctx.is_new_item {
-        ctx.scope.process_all_names(&mut |name, res| {
-            if let hir::ScopeDef::MacroDef(mac) = res {
-                acc.add_macro(ctx, Some(name.to_string()), mac);
-            }
-        })
+    if !ctx.is_new_item {
+        return;
     }
+
+    ctx.scope.process_all_names(&mut |name, res| {
+        if let hir::ScopeDef::MacroDef(mac) = res {
+            acc.add_macro(ctx, Some(name.clone()), mac);
+        }
+        // FIXME: This should be done in qualified_path/unqualified_path instead?
+        if let hir::ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) = res {
+            acc.add_resolution(ctx, name, &res);
+        }
+    })
 }
 
 #[cfg(test)]
diff --git a/crates/ide_completion/src/completions/mod_.rs b/crates/ide_completion/src/completions/mod_.rs
index 4f9415736..6a5746fb9 100644
--- a/crates/ide_completion/src/completions/mod_.rs
+++ b/crates/ide_completion/src/completions/mod_.rs
@@ -9,14 +9,14 @@ use ide_db::{
 };
 use rustc_hash::FxHashSet;
 
-use crate::CompletionItem;
+use crate::{patterns::ImmediateLocation, CompletionItem};
 
 use crate::{context::CompletionContext, item::CompletionKind, Completions};
 
 /// Complete mod declaration, i.e. `mod $0 ;`
 pub(crate) fn complete_mod(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
-    let mod_under_caret = match &ctx.mod_declaration_under_caret {
-        Some(mod_under_caret) if mod_under_caret.item_list().is_none() => mod_under_caret,
+    let mod_under_caret = match &ctx.completion_location {
+        Some(ImmediateLocation::ModDeclaration(mod_under_caret)) => mod_under_caret,
         _ => return None,
     };
 
diff --git a/crates/ide_completion/src/completions/pattern.rs b/crates/ide_completion/src/completions/pattern.rs
index 8dc9ab73c..8a728c67e 100644
--- a/crates/ide_completion/src/completions/pattern.rs
+++ b/crates/ide_completion/src/completions/pattern.rs
@@ -1,17 +1,15 @@
 //! Completes constants and paths in patterns.
 
-use crate::{CompletionContext, Completions};
+use crate::{context::PatternRefutability, CompletionContext, Completions};
 
 /// Completes constants and paths in patterns.
 pub(crate) fn complete_pattern(acc: &mut Completions, ctx: &CompletionContext) {
-    if !(ctx.is_pat_binding_or_const || ctx.is_irrefutable_pat_binding) {
-        return;
-    }
-    if ctx.record_pat_syntax.is_some() {
-        return;
-    }
+    let refutable = match ctx.is_pat_or_const {
+        Some(it) => it == PatternRefutability::Refutable,
+        None => return,
+    };
 
-    if !ctx.is_irrefutable_pat_binding {
+    if refutable {
         if let Some(hir::Adt::Enum(e)) =
             ctx.expected_type.as_ref().and_then(|ty| ty.strip_references().as_adt())
         {
@@ -31,14 +29,14 @@ pub(crate) fn complete_pattern(acc: &mut Completions, ctx: &CompletionContext) {
                     acc.add_struct_pat(ctx, *strukt, Some(name.clone()));
                     true
                 }
-                hir::ModuleDef::Variant(variant) if !ctx.is_irrefutable_pat_binding => {
+                hir::ModuleDef::Variant(variant) if refutable => {
                     acc.add_variant_pat(ctx, *variant, Some(name.clone()));
                     true
                 }
                 hir::ModuleDef::Adt(hir::Adt::Enum(..))
                 | hir::ModuleDef::Variant(..)
                 | hir::ModuleDef::Const(..)
-                | hir::ModuleDef::Module(..) => !ctx.is_irrefutable_pat_binding,
+                | hir::ModuleDef::Module(..) => refutable,
                 _ => false,
             },
             hir::ScopeDef::MacroDef(_) => true,
@@ -47,13 +45,13 @@ pub(crate) fn complete_pattern(acc: &mut Completions, ctx: &CompletionContext) {
                     acc.add_struct_pat(ctx, strukt, Some(name.clone()));
                     true
                 }
-                Some(hir::Adt::Enum(_)) => !ctx.is_irrefutable_pat_binding,
+                Some(hir::Adt::Enum(_)) => refutable,
                 _ => true,
             },
             _ => false,
         };
         if add_resolution {
-            acc.add_resolution(ctx, name.to_string(), &res);
+            acc.add_resolution(ctx, name, &res);
         }
     });
 }
@@ -402,4 +400,31 @@ impl Foo {
             "#]],
         )
     }
+
+    #[test]
+    fn completes_in_record_field_pat() {
+        check_snippet(
+            r#"
+struct Foo { bar: Bar }
+struct Bar(u32);
+fn outer(Foo { bar: $0 }: Foo) {}
+"#,
+            expect![[r#"
+                bn Foo Foo { bar$1 }$0
+                bn Bar Bar($1)$0
+            "#]],
+        )
+    }
+
+    #[test]
+    fn skips_in_record_field_pat_name() {
+        check_snippet(
+            r#"
+struct Foo { bar: Bar }
+struct Bar(u32);
+fn outer(Foo { bar$0 }: Foo) {}
+"#,
+            expect![[r#""#]],
+        )
+    }
 }
diff --git a/crates/ide_completion/src/completions/qualified_path.rs b/crates/ide_completion/src/completions/qualified_path.rs
index eedb44873..de58ce1cd 100644
--- a/crates/ide_completion/src/completions/qualified_path.rs
+++ b/crates/ide_completion/src/completions/qualified_path.rs
@@ -1,27 +1,39 @@
 //! Completion of paths, i.e. `some::prefix::$0`.
 
-use hir::{Adt, HasVisibility, PathResolution, ScopeDef};
+use hir::HasVisibility;
 use rustc_hash::FxHashSet;
 use syntax::AstNode;
 
 use crate::{CompletionContext, Completions};
 
 pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionContext) {
+    if ctx.is_path_disallowed() || ctx.expects_item() {
+        return;
+    }
     let path = match &ctx.path_qual {
         Some(path) => path.clone(),
         None => return,
     };
 
-    if ctx.attribute_under_caret.is_some() || ctx.mod_declaration_under_caret.is_some() {
-        return;
-    }
-
-    let context_module = ctx.scope.module();
-
     let resolution = match ctx.sema.resolve_path(&path) {
         Some(res) => res,
         None => return,
     };
+    let context_module = ctx.scope.module();
+    if ctx.expects_assoc_item() {
+        if let hir::PathResolution::Def(hir::ModuleDef::Module(module)) = resolution {
+            let module_scope = module.scope(ctx.db, context_module);
+            for (name, def) in module_scope {
+                if let hir::ScopeDef::MacroDef(macro_def) = def {
+                    acc.add_macro(ctx, Some(name.clone()), macro_def);
+                }
+                if let hir::ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) = def {
+                    acc.add_resolution(ctx, name, &def);
+                }
+            }
+        }
+        return;
+    }
 
     // Add associated types on type parameters and `Self`.
     resolution.assoc_type_shorthand_candidates(ctx.db, |_, alias| {
@@ -30,11 +42,11 @@ pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
     });
 
     match resolution {
-        PathResolution::Def(hir::ModuleDef::Module(module)) => {
+        hir::PathResolution::Def(hir::ModuleDef::Module(module)) => {
             let module_scope = module.scope(ctx.db, context_module);
             for (name, def) in module_scope {
                 if ctx.use_item_syntax.is_some() {
-                    if let ScopeDef::Unknown = def {
+                    if let hir::ScopeDef::Unknown = def {
                         if let Some(name_ref) = ctx.name_ref_syntax.as_ref() {
                             if name_ref.syntax().text() == name.to_string().as_str() {
                                 // for `use self::foo$0`, don't suggest `foo` as a completion
@@ -45,20 +57,20 @@ pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
                     }
                 }
 
-                acc.add_resolution(ctx, name.to_string(), &def);
+                acc.add_resolution(ctx, name, &def);
             }
         }
-        PathResolution::Def(def @ hir::ModuleDef::Adt(_))
-        | PathResolution::Def(def @ hir::ModuleDef::TypeAlias(_))
-        | PathResolution::Def(def @ hir::ModuleDef::BuiltinType(_)) => {
-            if let hir::ModuleDef::Adt(Adt::Enum(e)) = def {
+        hir::PathResolution::Def(def @ hir::ModuleDef::Adt(_))
+        | hir::PathResolution::Def(def @ hir::ModuleDef::TypeAlias(_))
+        | hir::PathResolution::Def(def @ hir::ModuleDef::BuiltinType(_)) => {
+            if let hir::ModuleDef::Adt(hir::Adt::Enum(e)) = def {
                 add_enum_variants(ctx, acc, e);
             }
             let ty = match def {
                 hir::ModuleDef::Adt(adt) => adt.ty(ctx.db),
                 hir::ModuleDef::TypeAlias(a) => {
                     let ty = a.ty(ctx.db);
-                    if let Some(Adt::Enum(e)) = ty.as_adt() {
+                    if let Some(hir::Adt::Enum(e)) = ty.as_adt() {
                         cov_mark::hit!(completes_variant_through_alias);
                         add_enum_variants(ctx, acc, e);
                     }
@@ -105,7 +117,7 @@ pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
                 });
             }
         }
-        PathResolution::Def(hir::ModuleDef::Trait(t)) => {
+        hir::PathResolution::Def(hir::ModuleDef::Trait(t)) => {
             // Handles `Trait::assoc` as well as `<Ty as Trait>::assoc`.
             for item in t.items(ctx.db) {
                 if context_module.map_or(false, |m| !item.is_visible_from(ctx.db, m)) {
@@ -118,15 +130,15 @@ pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
                 }
             }
         }
-        PathResolution::TypeParam(_) | PathResolution::SelfType(_) => {
+        hir::PathResolution::TypeParam(_) | hir::PathResolution::SelfType(_) => {
             if let Some(krate) = ctx.krate {
                 let ty = match resolution {
-                    PathResolution::TypeParam(param) => param.ty(ctx.db),
-                    PathResolution::SelfType(impl_def) => impl_def.self_ty(ctx.db),
+                    hir::PathResolution::TypeParam(param) => param.ty(ctx.db),
+                    hir::PathResolution::SelfType(impl_def) => impl_def.self_ty(ctx.db),
                     _ => return,
                 };
 
-                if let Some(Adt::Enum(e)) = ty.as_adt() {
+                if let Some(hir::Adt::Enum(e)) = ty.as_adt() {
                     add_enum_variants(ctx, acc, e);
                 }
 
@@ -596,7 +608,7 @@ fn main() { T::$0; }
 macro_rules! foo { () => {} }
 
 fn main() { let _ = crate::$0 }
-        "#,
+"#,
             expect![[r##"
                 fn main()  fn()
                 ma foo!(…) #[macro_export] macro_rules! foo
@@ -605,6 +617,44 @@ fn main() { let _ = crate::$0 }
     }
 
     #[test]
+    fn completes_in_assoc_item_list() {
+        check(
+            r#"
+#[macro_export]
+macro_rules! foo { () => {} }
+mod bar {}
+
+struct MyStruct {}
+impl MyStruct {
+    crate::$0
+}
+"#,
+            expect![[r##"
+                md bar
+                ma foo! #[macro_export] macro_rules! foo
+            "##]],
+        );
+    }
+
+    #[test]
+    #[ignore] // FIXME doesn't complete anything atm
+    fn completes_in_item_list() {
+        check(
+            r#"
+struct MyStruct {}
+macro_rules! foo {}
+mod bar {}
+
+crate::$0
+"#,
+            expect![[r#"
+                md bar
+                ma foo! macro_rules! foo
+            "#]],
+        )
+    }
+
+    #[test]
     fn test_super_super_completion() {
         check(
             r#"
diff --git a/crates/ide_completion/src/completions/record.rs b/crates/ide_completion/src/completions/record.rs
index 2f95b8687..0ac47cdbe 100644
--- a/crates/ide_completion/src/completions/record.rs
+++ b/crates/ide_completion/src/completions/record.rs
@@ -2,41 +2,44 @@
 use ide_db::{helpers::FamousDefs, SymbolKind};
 use syntax::ast::Expr;
 
-use crate::{item::CompletionKind, CompletionContext, CompletionItem, Completions};
+use crate::{
+    item::CompletionKind, patterns::ImmediateLocation, CompletionContext, CompletionItem,
+    Completions,
+};
 
 pub(crate) fn complete_record(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
-    let missing_fields = match (ctx.record_pat_syntax.as_ref(), ctx.record_lit_syntax.as_ref()) {
-        (None, None) => return None,
-        (Some(_), Some(_)) => unreachable!("A record cannot be both a literal and a pattern"),
-        (Some(record_pat), _) => ctx.sema.record_pattern_missing_fields(record_pat),
-        (_, Some(record_lit)) => {
-            let ty = ctx.sema.type_of_expr(&Expr::RecordExpr(record_lit.clone()));
+    let missing_fields = match &ctx.completion_location {
+        Some(ImmediateLocation::RecordExpr(record_expr)) => {
+            let ty = ctx.sema.type_of_expr(&Expr::RecordExpr(record_expr.clone()));
             let default_trait = FamousDefs(&ctx.sema, ctx.krate).core_default_Default();
             let impl_default_trait = default_trait
-                .and_then(|default_trait| ty.map(|ty| ty.impls_trait(ctx.db, default_trait, &[])))
-                .unwrap_or(false);
+                .zip(ty)
+                .map_or(false, |(default_trait, ty)| ty.impls_trait(ctx.db, default_trait, &[]));
 
-            let missing_fields = ctx.sema.record_literal_missing_fields(record_lit);
+            let missing_fields = ctx.sema.record_literal_missing_fields(record_expr);
             if impl_default_trait && !missing_fields.is_empty() {
                 let completion_text = "..Default::default()";
-                let completion_text = completion_text
-                    .strip_prefix(ctx.token.to_string().as_str())
-                    .unwrap_or(completion_text);
                 let mut item = CompletionItem::new(
                     CompletionKind::Snippet,
                     ctx.source_range(),
-                    "..Default::default()",
+                    completion_text,
                 );
+                let completion_text =
+                    completion_text.strip_prefix(ctx.token.text()).unwrap_or(completion_text);
                 item.insert_text(completion_text).kind(SymbolKind::Field);
                 item.add_to(acc);
             }
 
             missing_fields
         }
+        Some(ImmediateLocation::RecordPat(record_pat)) => {
+            ctx.sema.record_pattern_missing_fields(record_pat)
+        }
+        _ => return None,
     };
 
     for (field, ty) in missing_fields {
-        acc.add_field(ctx, field, &ty);
+        acc.add_field(ctx, None, field, &ty);
     }
 
     Some(())
@@ -108,8 +111,6 @@ fn process(f: S) {
         check_snippet(
             test_code,
             expect![[r#"
-                sn pd
-                sn ppd
                 fd ..Default::default()
             "#]],
         );
@@ -179,13 +180,7 @@ fn process(f: S) {
             "#]],
         );
 
-        check_snippet(
-            test_code,
-            expect![[r#"
-                sn pd
-                sn ppd
-            "#]],
-        );
+        check_snippet(test_code, expect![[r#""#]]);
     }
 
     #[test]
diff --git a/crates/ide_completion/src/completions/snippet.rs b/crates/ide_completion/src/completions/snippet.rs
index 7f7830976..defc25b00 100644
--- a/crates/ide_completion/src/completions/snippet.rs
+++ b/crates/ide_completion/src/completions/snippet.rs
@@ -14,7 +14,7 @@ fn snippet(ctx: &CompletionContext, cap: SnippetCap, label: &str, snippet: &str)
 }
 
 pub(crate) fn complete_expr_snippet(acc: &mut Completions, ctx: &CompletionContext) {
-    if !(ctx.is_trivial_path && ctx.function_syntax.is_some()) {
+    if !(ctx.is_trivial_path && ctx.function_def.is_some()) {
         return;
     }
     let cap = match ctx.config.snippet_cap {
@@ -22,8 +22,10 @@ pub(crate) fn complete_expr_snippet(acc: &mut Completions, ctx: &CompletionConte
         None => return,
     };
 
-    snippet(ctx, cap, "pd", "eprintln!(\"$0 = {:?}\", $0);").add_to(acc);
-    snippet(ctx, cap, "ppd", "eprintln!(\"$0 = {:#?}\", $0);").add_to(acc);
+    if ctx.can_be_stmt {
+        snippet(ctx, cap, "pd", "eprintln!(\"$0 = {:?}\", $0);").add_to(acc);
+        snippet(ctx, cap, "ppd", "eprintln!(\"$0 = {:#?}\", $0);").add_to(acc);
+    }
 }
 
 pub(crate) fn complete_item_snippet(acc: &mut Completions, ctx: &CompletionContext) {
diff --git a/crates/ide_completion/src/completions/unqualified_path.rs b/crates/ide_completion/src/completions/unqualified_path.rs
index 7875500c1..20188a7dd 100644
--- a/crates/ide_completion/src/completions/unqualified_path.rs
+++ b/crates/ide_completion/src/completions/unqualified_path.rs
@@ -1,7 +1,6 @@
 //! Completion of names from the current scope, e.g. locals and imported items.
 
 use hir::ScopeDef;
-use syntax::AstNode;
 
 use crate::{CompletionContext, Completions};
 
@@ -9,11 +8,29 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
     if !ctx.is_trivial_path {
         return;
     }
-    if ctx.record_lit_syntax.is_some()
-        || ctx.record_pat_syntax.is_some()
-        || ctx.attribute_under_caret.is_some()
-        || ctx.mod_declaration_under_caret.is_some()
-    {
+    if ctx.is_path_disallowed() || ctx.expects_item() {
+        return;
+    }
+
+    if ctx.expects_assoc_item() {
+        ctx.scope.process_all_names(&mut |name, def| {
+            if let ScopeDef::MacroDef(macro_def) = def {
+                acc.add_macro(ctx, Some(name.clone()), macro_def);
+            }
+            if let ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) = def {
+                acc.add_resolution(ctx, name, &def);
+            }
+        });
+        return;
+    }
+
+    if ctx.expects_use_tree() {
+        cov_mark::hit!(only_completes_modules_in_import);
+        ctx.scope.process_all_names(&mut |name, res| {
+            if let ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) = res {
+                acc.add_resolution(ctx, name, &res);
+            }
+        });
         return;
     }
 
@@ -30,15 +47,7 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
             cov_mark::hit!(skip_lifetime_completion);
             return;
         }
-        if ctx.use_item_syntax.is_some() {
-            if let (ScopeDef::Unknown, Some(name_ref)) = (&res, &ctx.name_ref_syntax) {
-                if name_ref.syntax().text() == name.to_string().as_str() {
-                    cov_mark::hit!(self_fulfilling_completion);
-                    return;
-                }
-            }
-        }
-        acc.add_resolution(ctx, name.to_string(), &res);
+        acc.add_resolution(ctx, name, &res);
     });
 }
 
@@ -61,15 +70,17 @@ mod tests {
     }
 
     #[test]
-    fn self_fulfilling_completion() {
-        cov_mark::check!(self_fulfilling_completion);
+    fn only_completes_modules_in_import() {
+        cov_mark::check!(only_completes_modules_in_import);
         check(
             r#"
-use foo$0
-use std::collections;
+use f$0
+
+struct Foo;
+mod foo {}
 "#,
             expect![[r#"
-                ?? collections
+                md foo
             "#]],
         );
     }
@@ -86,7 +97,7 @@ fn quux(x: Option<Enum>) {
     }
 }
 "#,
-            expect![[""]],
+            expect![[r#""#]],
         );
     }
 
@@ -102,7 +113,7 @@ fn quux(x: Option<Enum>) {
     }
 }
 "#,
-            expect![[""]],
+            expect![[r#""#]],
         );
     }
 
@@ -651,7 +662,7 @@ fn f() {}
     }
 
     #[test]
-    fn completes_type_or_trait_in_impl_block() {
+    fn completes_target_type_or_trait_in_impl_block() {
         check(
             r#"
 trait MyTrait {}
@@ -666,4 +677,41 @@ impl My$0
             "#]],
         )
     }
+
+    #[test]
+    fn completes_in_assoc_item_list() {
+        check(
+            r#"
+macro_rules! foo {}
+mod bar {}
+
+struct MyStruct {}
+impl MyStruct {
+    $0
+}
+"#,
+            expect![[r#"
+                md bar
+                ma foo! macro_rules! foo
+            "#]],
+        )
+    }
+
+    // FIXME: The completions here currently come from `macro_in_item_position`, but they shouldn't
+    #[test]
+    fn completes_in_item_list() {
+        check(
+            r#"
+struct MyStruct {}
+macro_rules! foo {}
+mod bar {}
+
+$0
+"#,
+            expect![[r#"
+                md bar
+                ma foo!(…) macro_rules! foo
+            "#]],
+        )
+    }
 }