21 files changed, 249 insertions, 243 deletions

diff --git a/crates/ra_ide/src/call_info.rs b/crates/ra_ide/src/call_info.rs
index 780a03c13..aa039e6fc 100644
--- a/crates/ra_ide/src/call_info.rs
+++ b/crates/ra_ide/src/call_info.rs
@@ -5,7 +5,7 @@ use ra_syntax::{
     ast::{self, ArgListOwner},
     match_ast, AstNode, SyntaxNode, SyntaxToken,
 };
-use test_utils::tested_by;
+use test_utils::mark;
 
 use crate::{CallInfo, FilePosition, FunctionSignature};
 
@@ -84,7 +84,7 @@ fn call_info_for_token(sema: &Semantics<RootDatabase>, token: SyntaxToken) -> Op
 
                 let arg_list_range = arg_list.syntax().text_range();
                 if !arg_list_range.contains_inclusive(token.text_range().start()) {
-                    tested_by!(call_info_bad_offset);
+                    mark::hit!(call_info_bad_offset);
                     return None;
                 }
 
@@ -213,7 +213,7 @@ impl CallInfo {
 
 #[cfg(test)]
 mod tests {
-    use test_utils::covers;
+    use test_utils::mark;
 
     use crate::mock_analysis::single_file_with_position;
 
@@ -529,7 +529,7 @@ By default this method stops actor's `Context`."#
 
     #[test]
     fn call_info_bad_offset() {
-        covers!(call_info_bad_offset);
+        mark::check!(call_info_bad_offset);
         let (analysis, position) = single_file_with_position(
             r#"fn foo(x: u32, y: u32) -> u32 {x + y}
                fn bar() { foo <|> (3, ); }"#,
diff --git a/crates/ra_ide/src/completion.rs b/crates/ra_ide/src/completion.rs
index 8bdc43b1a..191300704 100644
--- a/crates/ra_ide/src/completion.rs
+++ b/crates/ra_ide/src/completion.rs
@@ -59,8 +59,8 @@ pub use crate::completion::{
 /// with ordering of completions (currently this is done by the client).
 pub(crate) fn completions(
     db: &RootDatabase,
-    position: FilePosition,
     config: &CompletionConfig,
+    position: FilePosition,
 ) -> Option<Completions> {
     let ctx = CompletionContext::new(db, position, config)?;
 
diff --git a/crates/ra_ide/src/completion/complete_qualified_path.rs b/crates/ra_ide/src/completion/complete_qualified_path.rs
index db7430454..02ac0166b 100644
--- a/crates/ra_ide/src/completion/complete_qualified_path.rs
+++ b/crates/ra_ide/src/completion/complete_qualified_path.rs
@@ -3,7 +3,7 @@
 use hir::{Adt, HasVisibility, PathResolution, ScopeDef};
 use ra_syntax::AstNode;
 use rustc_hash::FxHashSet;
-use test_utils::tested_by;
+use test_utils::mark;
 
 use crate::completion::{CompletionContext, Completions};
 
@@ -40,7 +40,7 @@ pub(super) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
                         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<|>`, don't suggest `foo` as a completion
-                                tested_by!(dont_complete_current_use);
+                                mark::hit!(dont_complete_current_use);
                                 continue;
                             }
                         }
@@ -147,7 +147,7 @@ pub(super) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
 
 #[cfg(test)]
 mod tests {
-    use test_utils::covers;
+    use test_utils::mark;
 
     use crate::completion::{test_utils::do_completion, CompletionItem, CompletionKind};
     use insta::assert_debug_snapshot;
@@ -158,7 +158,7 @@ mod tests {
 
     #[test]
     fn dont_complete_current_use() {
-        covers!(dont_complete_current_use);
+        mark::check!(dont_complete_current_use);
         let completions = do_completion(r"use self::foo<|>;", CompletionKind::Reference);
         assert!(completions.is_empty());
     }
diff --git a/crates/ra_ide/src/completion/complete_unqualified_path.rs b/crates/ra_ide/src/completion/complete_unqualified_path.rs
index bd40af1cb..db791660a 100644
--- a/crates/ra_ide/src/completion/complete_unqualified_path.rs
+++ b/crates/ra_ide/src/completion/complete_unqualified_path.rs
@@ -1,7 +1,7 @@
 //! Completion of names from the current scope, e.g. locals and imported items.
 
 use hir::ScopeDef;
-use test_utils::tested_by;
+use test_utils::mark;
 
 use crate::completion::{CompletionContext, Completions};
 use hir::{Adt, ModuleDef, Type};
@@ -30,7 +30,7 @@ pub(super) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
         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() {
-                    tested_by!(self_fulfilling_completion);
+                    mark::hit!(self_fulfilling_completion);
                     return;
                 }
             }
@@ -66,7 +66,7 @@ fn complete_enum_variants(acc: &mut Completions, ctx: &CompletionContext, ty: &T
 #[cfg(test)]
 mod tests {
     use insta::assert_debug_snapshot;
-    use test_utils::covers;
+    use test_utils::mark;
 
     use crate::completion::{test_utils::do_completion, CompletionItem, CompletionKind};
 
@@ -76,7 +76,7 @@ mod tests {
 
     #[test]
     fn self_fulfilling_completion() {
-        covers!(self_fulfilling_completion);
+        mark::check!(self_fulfilling_completion);
         assert_debug_snapshot!(
             do_reference_completion(
                 r#"
diff --git a/crates/ra_ide/src/completion/completion_item.rs b/crates/ra_ide/src/completion/completion_item.rs
index 6021f7279..cfb7c1e38 100644
--- a/crates/ra_ide/src/completion/completion_item.rs
+++ b/crates/ra_ide/src/completion/completion_item.rs
@@ -63,8 +63,8 @@ impl fmt::Debug for CompletionItem {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let mut s = f.debug_struct("CompletionItem");
         s.field("label", &self.label()).field("source_range", &self.source_range());
-        if self.text_edit().as_indels().len() == 1 {
-            let atom = &self.text_edit().as_indels()[0];
+        if self.text_edit().len() == 1 {
+            let atom = &self.text_edit().iter().next().unwrap();
             s.field("delete", &atom.delete);
             s.field("insert", &atom.insert);
         } else {
diff --git a/crates/ra_ide/src/completion/presentation.rs b/crates/ra_ide/src/completion/presentation.rs
index 077cf9647..440ffa31d 100644
--- a/crates/ra_ide/src/completion/presentation.rs
+++ b/crates/ra_ide/src/completion/presentation.rs
@@ -3,7 +3,7 @@
 use hir::{Docs, HasAttrs, HasSource, HirDisplay, ModPath, ScopeDef, StructKind, Type};
 use ra_syntax::ast::NameOwner;
 use stdx::SepBy;
-use test_utils::tested_by;
+use test_utils::mark;
 
 use crate::{
     completion::{
@@ -121,7 +121,7 @@ impl Completions {
                     _ => false,
                 };
                 if has_non_default_type_params {
-                    tested_by!(inserts_angle_brackets_for_generics);
+                    mark::hit!(inserts_angle_brackets_for_generics);
                     completion_item = completion_item
                         .lookup_by(local_name.clone())
                         .label(format!("{}<…>", local_name))
@@ -176,7 +176,7 @@ impl Completions {
             }
             None if needs_bang => builder.insert_text(format!("{}!", name)),
             _ => {
-                tested_by!(dont_insert_macro_call_parens_unncessary);
+                mark::hit!(dont_insert_macro_call_parens_unncessary);
                 builder.insert_text(name)
             }
         };
@@ -330,14 +330,14 @@ pub(crate) fn compute_score(
     // FIXME: this should not fall back to string equality.
     let ty = &ty.display(ctx.db).to_string();
     let (active_name, active_type) = if let Some(record_field) = &ctx.record_field_syntax {
-        tested_by!(test_struct_field_completion_in_record_lit);
+        mark::hit!(test_struct_field_completion_in_record_lit);
         let (struct_field, _local) = ctx.sema.resolve_record_field(record_field)?;
         (
             struct_field.name(ctx.db).to_string(),
             struct_field.signature_ty(ctx.db).display(ctx.db).to_string(),
         )
     } else if let Some(active_parameter) = &ctx.active_parameter {
-        tested_by!(test_struct_field_completion_in_func_call);
+        mark::hit!(test_struct_field_completion_in_func_call);
         (active_parameter.name.clone(), active_parameter.ty.clone())
     } else {
         return None;
@@ -398,7 +398,7 @@ impl Builder {
             None => return self,
         };
         // If not an import, add parenthesis automatically.
-        tested_by!(inserts_parens_for_function_calls);
+        mark::hit!(inserts_parens_for_function_calls);
 
         let (snippet, label) = if params.is_empty() {
             (format!("{}()$0", name), format!("{}()", name))
@@ -457,7 +457,7 @@ fn guess_macro_braces(macro_name: &str, docs: &str) -> (&'static str, &'static s
 #[cfg(test)]
 mod tests {
     use insta::assert_debug_snapshot;
-    use test_utils::covers;
+    use test_utils::mark;
 
     use crate::completion::{
         test_utils::{do_completion, do_completion_with_options},
@@ -607,7 +607,7 @@ mod tests {
 
     #[test]
     fn inserts_parens_for_function_calls() {
-        covers!(inserts_parens_for_function_calls);
+        mark::check!(inserts_parens_for_function_calls);
         assert_debug_snapshot!(
             do_reference_completion(
                 r"
@@ -992,7 +992,7 @@ mod tests {
 
     #[test]
     fn inserts_angle_brackets_for_generics() {
-        covers!(inserts_angle_brackets_for_generics);
+        mark::check!(inserts_angle_brackets_for_generics);
         assert_debug_snapshot!(
             do_reference_completion(
                 r"
@@ -1115,7 +1115,7 @@ mod tests {
 
     #[test]
     fn dont_insert_macro_call_parens_unncessary() {
-        covers!(dont_insert_macro_call_parens_unncessary);
+        mark::check!(dont_insert_macro_call_parens_unncessary);
         assert_debug_snapshot!(
             do_reference_completion(
                 r"
@@ -1181,7 +1181,7 @@ mod tests {
 
     #[test]
     fn test_struct_field_completion_in_func_call() {
-        covers!(test_struct_field_completion_in_func_call);
+        mark::check!(test_struct_field_completion_in_func_call);
         assert_debug_snapshot!(
         do_reference_completion(
                 r"
@@ -1271,7 +1271,7 @@ mod tests {
 
     #[test]
     fn test_struct_field_completion_in_record_lit() {
-        covers!(test_struct_field_completion_in_record_lit);
+        mark::check!(test_struct_field_completion_in_record_lit);
         assert_debug_snapshot!(
         do_reference_completion(
                 r"
diff --git a/crates/ra_ide/src/completion/test_utils.rs b/crates/ra_ide/src/completion/test_utils.rs
index eb90b5279..bf22452a2 100644
--- a/crates/ra_ide/src/completion/test_utils.rs
+++ b/crates/ra_ide/src/completion/test_utils.rs
@@ -20,7 +20,7 @@ pub(crate) fn do_completion_with_options(
     } else {
         single_file_with_position(code)
     };
-    let completions = analysis.completions(position, options).unwrap().unwrap();
+    let completions = analysis.completions(options, position).unwrap().unwrap();
     let completion_items: Vec<CompletionItem> = completions.into();
     let mut kind_completions: Vec<CompletionItem> =
         completion_items.into_iter().filter(|c| c.completion_kind == kind).collect();
diff --git a/crates/ra_ide/src/diagnostics.rs b/crates/ra_ide/src/diagnostics.rs
index 87a0b80f1..3d83c0f71 100644
--- a/crates/ra_ide/src/diagnostics.rs
+++ b/crates/ra_ide/src/diagnostics.rs
@@ -21,7 +21,7 @@ use ra_syntax::{
 };
 use ra_text_edit::{TextEdit, TextEditBuilder};
 
-use crate::{Diagnostic, FileId, FileSystemEdit, SourceChange, SourceFileEdit};
+use crate::{Diagnostic, FileId, FileSystemEdit, Fix, SourceChange, SourceFileEdit};
 
 #[derive(Debug, Copy, Clone)]
 pub enum Severity {
@@ -63,8 +63,8 @@ pub(crate) fn diagnostics(db: &RootDatabase, file_id: FileId) -> Vec<Diagnostic>
             .parent()
             .unwrap_or_else(|| RelativePath::new(""))
             .join(&d.candidate);
-        let create_file = FileSystemEdit::CreateFile { source_root, path };
-        let fix = SourceChange::file_system_edit("Create module", create_file);
+        let fix =
+            Fix::new("Create module", FileSystemEdit::CreateFile { source_root, path }.into());
         res.borrow_mut().push(Diagnostic {
             range: sema.diagnostics_range(d).range,
             message: d.message(),
@@ -88,14 +88,12 @@ pub(crate) fn diagnostics(db: &RootDatabase, file_id: FileId) -> Vec<Diagnostic>
                 field_list = field_list.append_field(&field);
             }
 
-            let mut builder = TextEditBuilder::default();
-            algo::diff(&d.ast(db).syntax(), &field_list.syntax()).into_text_edit(&mut builder);
-
-            Some(SourceChange::source_file_edit_from(
-                "Fill struct fields",
-                file_id,
-                builder.finish(),
-            ))
+            let edit = {
+                let mut builder = TextEditBuilder::default();
+                algo::diff(&d.ast(db).syntax(), &field_list.syntax()).into_text_edit(&mut builder);
+                builder.finish()
+            };
+            Some(Fix::new("Fill struct fields", SourceFileEdit { file_id, edit }.into()))
         };
 
         res.borrow_mut().push(Diagnostic {
@@ -117,7 +115,8 @@ pub(crate) fn diagnostics(db: &RootDatabase, file_id: FileId) -> Vec<Diagnostic>
         let node = d.ast(db);
         let replacement = format!("Ok({})", node.syntax());
         let edit = TextEdit::replace(node.syntax().text_range(), replacement);
-        let fix = SourceChange::source_file_edit_from("Wrap with ok", file_id, edit);
+        let source_change = SourceChange::source_file_edit_from(file_id, edit);
+        let fix = Fix::new("Wrap with ok", source_change);
         res.borrow_mut().push(Diagnostic {
             range: sema.diagnostics_range(d).range,
             message: d.message(),
@@ -154,9 +153,9 @@ fn check_unnecessary_braces_in_use_statement(
             range,
             message: "Unnecessary braces in use statement".to_string(),
             severity: Severity::WeakWarning,
-            fix: Some(SourceChange::source_file_edit(
+            fix: Some(Fix::new(
                 "Remove unnecessary braces",
-                SourceFileEdit { file_id, edit },
+                SourceFileEdit { file_id, edit }.into(),
             )),
         });
     }
@@ -198,9 +197,9 @@ fn check_struct_shorthand_initialization(
                     range: record_field.syntax().text_range(),
                     message: "Shorthand struct initialization".to_string(),
                     severity: Severity::WeakWarning,
-                    fix: Some(SourceChange::source_file_edit(
+                    fix: Some(Fix::new(
                         "Use struct shorthand initialization",
-                        SourceFileEdit { file_id, edit },
+                        SourceFileEdit { file_id, edit }.into(),
                     )),
                 });
             }
@@ -240,7 +239,7 @@ mod tests {
         let diagnostic =
             diagnostics.pop().unwrap_or_else(|| panic!("no diagnostics for:\n{}\n", before));
         let mut fix = diagnostic.fix.unwrap();
-        let edit = fix.source_file_edits.pop().unwrap().edit;
+        let edit = fix.source_change.source_file_edits.pop().unwrap().edit;
         let actual = {
             let mut actual = before.to_string();
             edit.apply(&mut actual);
@@ -258,7 +257,7 @@ mod tests {
         let (analysis, file_position) = analysis_and_position(fixture);
         let diagnostic = analysis.diagnostics(file_position.file_id).unwrap().pop().unwrap();
         let mut fix = diagnostic.fix.unwrap();
-        let edit = fix.source_file_edits.pop().unwrap().edit;
+        let edit = fix.source_change.source_file_edits.pop().unwrap().edit;
         let target_file_contents = analysis.file_text(file_position.file_id).unwrap();
         let actual = {
             let mut actual = target_file_contents.to_string();
@@ -295,7 +294,7 @@ mod tests {
         let (analysis, file_id) = single_file(before);
         let diagnostic = analysis.diagnostics(file_id).unwrap().pop().unwrap();
         let mut fix = diagnostic.fix.unwrap();
-        let edit = fix.source_file_edits.pop().unwrap().edit;
+        let edit = fix.source_change.source_file_edits.pop().unwrap().edit;
         let actual = {
             let mut actual = before.to_string();
             edit.apply(&mut actual);
@@ -616,22 +615,24 @@ mod tests {
             Diagnostic {
                 message: "unresolved module",
                 range: 0..8,
+                severity: Error,
                 fix: Some(
-                    SourceChange {
+                    Fix {
                         label: "Create module",
-                        source_file_edits: [],
-                        file_system_edits: [
-                            CreateFile {
-                                source_root: SourceRootId(
-                                    0,
-                                ),
-                                path: "foo.rs",
-                            },
-                        ],
-                        cursor_position: None,
+                        source_change: SourceChange {
+                            source_file_edits: [],
+                            file_system_edits: [
+                                CreateFile {
+                                    source_root: SourceRootId(
+                                        0,
+                                    ),
+                                    path: "foo.rs",
+                                },
+                            ],
+                            is_snippet: false,
+                        },
                     },
                 ),
-                severity: Error,
             },
         ]
         "###);
@@ -665,29 +666,31 @@ mod tests {
             Diagnostic {
                 message: "Missing structure fields:\n- b",
                 range: 224..233,
+                severity: Error,
                 fix: Some(
-                    SourceChange {
+                    Fix {
                         label: "Fill struct fields",
-                        source_file_edits: [
-                            SourceFileEdit {
-                                file_id: FileId(
-                                    1,
-                                ),
-                                edit: TextEdit {
-                                    indels: [
-                                        Indel {
-                                            insert: "{a:42, b: ()}",
-                                            delete: 3..9,
-                                        },
-                                    ],
+                        source_change: SourceChange {
+                            source_file_edits: [
+                                SourceFileEdit {
+                                    file_id: FileId(
+                                        1,
+                                    ),
+                                    edit: TextEdit {
+                                        indels: [
+                                            Indel {
+                                                insert: "{a:42, b: ()}",
+                                                delete: 3..9,
+                                            },
+                                        ],
+                                    },
                                 },
-                            },
-                        ],
-                        file_system_edits: [],
-                        cursor_position: None,
+                            ],
+                            file_system_edits: [],
+                            is_snippet: false,
+                        },
                     },
                 ),
-                severity: Error,
             },
         ]
         "###);
diff --git a/crates/ra_ide/src/display.rs b/crates/ra_ide/src/display.rs
index 722092de9..8bb312156 100644
--- a/crates/ra_ide/src/display.rs
+++ b/crates/ra_ide/src/display.rs
@@ -79,14 +79,14 @@ pub(crate) fn rust_code_markup_with_doc(
     doc: Option<&str>,
     mod_path: Option<&str>,
 ) -> String {
-    let mut buf = "```rust\n".to_owned();
+    let mut buf = String::new();
 
     if let Some(mod_path) = mod_path {
         if !mod_path.is_empty() {
-            format_to!(buf, "{}\n", mod_path);
+            format_to!(buf, "{}\n___\n\n", mod_path);
         }
     }
-    format_to!(buf, "{}\n```", code);
+    format_to!(buf, "```rust\n{}\n```", code);
 
     if let Some(doc) = doc {
         format_to!(buf, "\n\n{}", doc);
diff --git a/crates/ra_ide/src/goto_definition.rs b/crates/ra_ide/src/goto_definition.rs
index 150895abb..90e85d419 100644
--- a/crates/ra_ide/src/goto_definition.rs
+++ b/crates/ra_ide/src/goto_definition.rs
@@ -93,7 +93,7 @@ pub(crate) fn reference_definition(
 
 #[cfg(test)]
 mod tests {
-    use test_utils::{assert_eq_text, covers};
+    use test_utils::assert_eq_text;
 
     use crate::mock_analysis::analysis_and_position;
 
@@ -208,7 +208,6 @@ mod tests {
 
     #[test]
     fn goto_def_for_macros() {
-        covers!(ra_ide_db::goto_def_for_macros);
         check_goto(
             "
             //- /lib.rs
@@ -225,7 +224,6 @@ mod tests {
 
     #[test]
     fn goto_def_for_macros_from_other_crates() {
-        covers!(ra_ide_db::goto_def_for_macros);
         check_goto(
             "
             //- /lib.rs
@@ -245,7 +243,6 @@ mod tests {
 
     #[test]
     fn goto_def_for_use_alias() {
-        covers!(ra_ide_db::goto_def_for_use_alias);
         check_goto(
             "
             //- /lib.rs
@@ -370,7 +367,6 @@ mod tests {
 
     #[test]
     fn goto_def_for_methods() {
-        covers!(ra_ide_db::goto_def_for_methods);
         check_goto(
             "
             //- /lib.rs
@@ -390,7 +386,6 @@ mod tests {
 
     #[test]
     fn goto_def_for_fields() {
-        covers!(ra_ide_db::goto_def_for_fields);
         check_goto(
             r"
             //- /lib.rs
@@ -409,7 +404,6 @@ mod tests {
 
     #[test]
     fn goto_def_for_record_fields() {
-        covers!(ra_ide_db::goto_def_for_record_fields);
         check_goto(
             r"
             //- /lib.rs
@@ -430,7 +424,6 @@ mod tests {
 
     #[test]
     fn goto_def_for_record_pat_fields() {
-        covers!(ra_ide_db::goto_def_for_record_field_pats);
         check_goto(
             r"
             //- /lib.rs
@@ -873,7 +866,6 @@ mod tests {
 
     #[test]
     fn goto_def_for_field_init_shorthand() {
-        covers!(ra_ide_db::goto_def_for_field_init_shorthand);
         check_goto(
             "
             //- /lib.rs
diff --git a/crates/ra_ide/src/hover.rs b/crates/ra_ide/src/hover.rs
index befa977c7..1f4f6b848 100644
--- a/crates/ra_ide/src/hover.rs
+++ b/crates/ra_ide/src/hover.rs
@@ -405,7 +405,7 @@ mod tests {
                 };
             }
         "#,
-            &["Foo\nfield_a: u32"],
+            &["Foo\n___\n\n```rust\nfield_a: u32"],
         );
 
         // Hovering over the field in the definition
@@ -422,7 +422,7 @@ mod tests {
                 };
             }
         "#,
-            &["Foo\nfield_a: u32"],
+            &["Foo\n___\n\n```rust\nfield_a: u32"],
         );
     }
 
@@ -475,7 +475,7 @@ fn main() {
             ",
         );
         let hover = analysis.hover(position).unwrap().unwrap();
-        assert_eq!(trim_markup_opt(hover.info.first()), Some("Option\nSome"));
+        assert_eq!(trim_markup_opt(hover.info.first()), Some("Option\n___\n\n```rust\nSome"));
 
         let (analysis, position) = single_file_with_position(
             "
@@ -503,6 +503,9 @@ fn main() {
         "#,
             &["
 Option
+___
+
+```rust
 None
 ```
 
@@ -524,6 +527,9 @@ The None variant
         "#,
             &["
 Option
+___
+
+```rust
 Some
 ```
 
@@ -606,7 +612,10 @@ fn func(foo: i32) { if true { <|>foo; }; }
             ",
         );
         let hover = analysis.hover(position).unwrap().unwrap();
-        assert_eq!(trim_markup_opt(hover.info.first()), Some("wrapper::Thing\nfn new() -> Thing"));
+        assert_eq!(
+            trim_markup_opt(hover.info.first()),
+            Some("wrapper::Thing\n___\n\n```rust\nfn new() -> Thing")
+        );
     }
 
     #[test]
diff --git a/crates/ra_ide/src/join_lines.rs b/crates/ra_ide/src/join_lines.rs
index d3af780c4..af1ade8a1 100644
--- a/crates/ra_ide/src/join_lines.rs
+++ b/crates/ra_ide/src/join_lines.rs
@@ -166,16 +166,28 @@ fn is_trailing_comma(left: SyntaxKind, right: SyntaxKind) -> bool {
 
 #[cfg(test)]
 mod tests {
-    use crate::test_utils::{assert_eq_text, check_action, extract_range};
+    use ra_syntax::SourceFile;
+    use test_utils::{add_cursor, assert_eq_text, extract_offset, extract_range};
 
     use super::*;
 
     fn check_join_lines(before: &str, after: &str) {
-        check_action(before, after, |file, offset| {
-            let range = TextRange::empty(offset);
-            let res = join_lines(file, range);
-            Some(res)
-        })
+        let (before_cursor_pos, before) = extract_offset(before);
+        let file = SourceFile::parse(&before).ok().unwrap();
+
+        let range = TextRange::empty(before_cursor_pos);
+        let result = join_lines(&file, range);
+
+        let actual = {
+            let mut actual = before.to_string();
+            result.apply(&mut actual);
+            actual
+        };
+        let actual_cursor_pos = result
+            .apply_to_offset(before_cursor_pos)
+            .expect("cursor position is affected by the edit");
+        let actual = add_cursor(&actual, actual_cursor_pos);
+        assert_eq_text!(after, &actual);
     }
 
     #[test]
diff --git a/crates/ra_ide/src/lib.rs b/crates/ra_ide/src/lib.rs
index 78149ddfc..5ac002d82 100644
--- a/crates/ra_ide/src/lib.rs
+++ b/crates/ra_ide/src/lib.rs
@@ -42,11 +42,6 @@ mod inlay_hints;
 mod expand_macro;
 mod ssr;
 
-#[cfg(test)]
-mod marks;
-#[cfg(test)]
-mod test_utils;
-
 use std::sync::Arc;
 
 use ra_cfg::CfgOptions;
@@ -82,19 +77,19 @@ pub use crate::{
 };
 
 pub use hir::Documentation;
-pub use ra_assists::AssistId;
+pub use ra_assists::{AssistConfig, AssistId};
 pub use ra_db::{
     Canceled, CrateGraph, CrateId, Edition, FileId, FilePosition, FileRange, SourceRootId,
 };
 pub use ra_ide_db::{
     change::{AnalysisChange, LibraryData},
     line_index::{LineCol, LineIndex},
-    line_index_utils::translate_offset_with_edit,
     search::SearchScope,
     source_change::{FileSystemEdit, SourceChange, SourceFileEdit},
     symbol_index::Query,
     RootDatabase,
 };
+pub use ra_text_edit::{Indel, TextEdit};
 
 pub type Cancelable<T> = Result<T, Canceled>;
 
@@ -102,8 +97,22 @@ pub type Cancelable<T> = Result<T, Canceled>;
 pub struct Diagnostic {
     pub message: String,
     pub range: TextRange,
-    pub fix: Option<SourceChange>,
     pub severity: Severity,
+    pub fix: Option<Fix>,
+}
+
+#[derive(Debug)]
+pub struct Fix {
+    pub label: String,
+    pub source_change: SourceChange,
+}
+
+impl Fix {
+    pub fn new(label: impl Into<String>, source_change: SourceChange) -> Self {
+        let label = label.into();
+        assert!(label.starts_with(char::is_uppercase) && !label.ends_with('.'));
+        Self { label, source_change }
+    }
 }
 
 /// Info associated with a text range.
@@ -291,14 +300,10 @@ impl Analysis {
 
     /// Returns an edit to remove all newlines in the range, cleaning up minor
     /// stuff like trailing commas.
-    pub fn join_lines(&self, frange: FileRange) -> Cancelable<SourceChange> {
+    pub fn join_lines(&self, frange: FileRange) -> Cancelable<TextEdit> {
         self.with_db(|db| {
             let parse = db.parse(frange.file_id);
-            let file_edit = SourceFileEdit {
-                file_id: frange.file_id,
-                edit: join_lines::join_lines(&parse.tree(), frange.range),
-            };
-            SourceChange::source_file_edit("Join lines", file_edit)
+            join_lines::join_lines(&parse.tree(), frange.range)
         })
     }
 
@@ -458,17 +463,17 @@ impl Analysis {
     /// Computes completions at the given position.
     pub fn completions(
         &self,
-        position: FilePosition,
         config: &CompletionConfig,
+        position: FilePosition,
     ) -> Cancelable<Option<Vec<CompletionItem>>> {
-        self.with_db(|db| completion::completions(db, position, config).map(Into::into))
+        self.with_db(|db| completion::completions(db, config, position).map(Into::into))
     }
 
     /// Computes assists (aka code actions aka intentions) for the given
     /// position.
-    pub fn assists(&self, frange: FileRange) -> Cancelable<Vec<Assist>> {
+    pub fn assists(&self, config: &AssistConfig, frange: FileRange) -> Cancelable<Vec<Assist>> {
         self.with_db(|db| {
-            ra_assists::Assist::resolved(db, frange)
+            ra_assists::Assist::resolved(db, config, frange)
                 .into_iter()
                 .map(|assist| Assist {
                     id: assist.assist.id,
@@ -502,7 +507,7 @@ impl Analysis {
     ) -> Cancelable<Result<SourceChange, SsrError>> {
         self.with_db(|db| {
             let edits = ssr::parse_search_replace(query, parse_only, db)?;
-            Ok(SourceChange::source_file_edits("Structural Search Replace", edits))
+            Ok(SourceChange::source_file_edits(edits))
         })
     }
 
diff --git a/crates/ra_ide/src/marks.rs b/crates/ra_ide/src/marks.rs
deleted file mode 100644
index 51ca4dde3..000000000
--- a/crates/ra_ide/src/marks.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-//! See test_utils/src/marks.rs
-
-test_utils::marks!(
-    inserts_angle_brackets_for_generics
-    inserts_parens_for_function_calls
-    call_info_bad_offset
-    dont_complete_current_use
-    test_resolve_parent_module_on_module_decl
-    search_filters_by_range
-    dont_insert_macro_call_parens_unncessary
-    self_fulfilling_completion
-    test_struct_field_completion_in_func_call
-    test_struct_field_completion_in_record_lit
-    test_rename_struct_field_for_shorthand
-    test_rename_local_for_field_shorthand
-);
diff --git a/crates/ra_ide/src/parent_module.rs b/crates/ra_ide/src/parent_module.rs
index aaf4460df..a083fb1eb 100644
--- a/crates/ra_ide/src/parent_module.rs
+++ b/crates/ra_ide/src/parent_module.rs
@@ -7,7 +7,7 @@ use ra_syntax::{
     algo::find_node_at_offset,
     ast::{self, AstNode},
 };
-use test_utils::tested_by;
+use test_utils::mark;
 
 use crate::NavigationTarget;
 
@@ -25,7 +25,7 @@ pub(crate) fn parent_module(db: &RootDatabase, position: FilePosition) -> Vec<Na
             .item_list()
             .map_or(false, |it| it.syntax().text_range().contains_inclusive(position.offset))
         {
-            tested_by!(test_resolve_parent_module_on_module_decl);
+            mark::hit!(test_resolve_parent_module_on_module_decl);
             module = m.syntax().ancestors().skip(1).find_map(ast::Module::cast);
         }
     }
@@ -57,7 +57,7 @@ pub(crate) fn crate_for(db: &RootDatabase, file_id: FileId) -> Vec<CrateId> {
 mod tests {
     use ra_cfg::CfgOptions;
     use ra_db::Env;
-    use test_utils::covers;
+    use test_utils::mark;
 
     use crate::{
         mock_analysis::{analysis_and_position, MockAnalysis},
@@ -81,7 +81,7 @@ mod tests {
 
     #[test]
     fn test_resolve_parent_module_on_module_decl() {
-        covers!(test_resolve_parent_module_on_module_decl);
+        mark::check!(test_resolve_parent_module_on_module_decl);
         let (analysis, pos) = analysis_and_position(
             "
             //- /lib.rs
diff --git a/crates/ra_ide/src/references.rs b/crates/ra_ide/src/references.rs
index 074284b42..96444bf6a 100644
--- a/crates/ra_ide/src/references.rs
+++ b/crates/ra_ide/src/references.rs
@@ -190,8 +190,6 @@ fn get_struct_def_name_for_struct_literal_search(
 
 #[cfg(test)]
 mod tests {
-    use test_utils::covers;
-
     use crate::{
         mock_analysis::{analysis_and_position, single_file_with_position, MockAnalysis},
         Declaration, Reference, ReferenceSearchResult, SearchScope,
@@ -301,7 +299,6 @@ mod tests {
 
     #[test]
     fn search_filters_by_range() {
-        covers!(ra_ide_db::search_filters_by_range);
         let code = r#"
             fn foo() {
                 let spam<|> = 92;
diff --git a/crates/ra_ide/src/references/rename.rs b/crates/ra_ide/src/references/rename.rs
index 410dae75c..28c6349b1 100644
--- a/crates/ra_ide/src/references/rename.rs
+++ b/crates/ra_ide/src/references/rename.rs
@@ -9,7 +9,7 @@ use ra_syntax::{
 };
 use ra_text_edit::TextEdit;
 use std::convert::TryInto;
-use test_utils::tested_by;
+use test_utils::mark;
 
 use crate::{
     references::find_all_refs, FilePosition, FileSystemEdit, RangeInfo, Reference, ReferenceKind,
@@ -57,13 +57,13 @@ fn source_edit_from_reference(reference: Reference, new_name: &str) -> SourceFil
     let file_id = reference.file_range.file_id;
     let range = match reference.kind {
         ReferenceKind::FieldShorthandForField => {
-            tested_by!(test_rename_struct_field_for_shorthand);
+            mark::hit!(test_rename_struct_field_for_shorthand);
             replacement_text.push_str(new_name);
             replacement_text.push_str(": ");
             TextRange::new(reference.file_range.range.start(), reference.file_range.range.start())
         }
         ReferenceKind::FieldShorthandForLocal => {
-            tested_by!(test_rename_local_for_field_shorthand);
+            mark::hit!(test_rename_local_for_field_shorthand);
             replacement_text.push_str(": ");
             replacement_text.push_str(new_name);
             TextRange::new(reference.file_range.range.end(), reference.file_range.range.end())
@@ -128,7 +128,7 @@ fn rename_mod(
         source_file_edits.extend(ref_edits);
     }
 
-    Some(SourceChange::from_edits("Rename", source_file_edits, file_system_edits))
+    Some(SourceChange::from_edits(source_file_edits, file_system_edits))
 }
 
 fn rename_to_self(db: &RootDatabase, position: FilePosition) -> Option<RangeInfo<SourceChange>> {
@@ -171,7 +171,7 @@ fn rename_to_self(db: &RootDatabase, position: FilePosition) -> Option<RangeInfo
         ),
     });
 
-    Some(RangeInfo::new(range, SourceChange::source_file_edits("Rename", edits)))
+    Some(RangeInfo::new(range, SourceChange::source_file_edits(edits)))
 }
 
 fn text_edit_from_self_param(
@@ -234,7 +234,7 @@ fn rename_self_to_param(
     let range = ast::SelfParam::cast(self_token.parent())
         .map_or(self_token.text_range(), |p| p.syntax().text_range());
 
-    Some(RangeInfo::new(range, SourceChange::source_file_edits("Rename", edits)))
+    Some(RangeInfo::new(range, SourceChange::source_file_edits(edits)))
 }
 
 fn rename_reference(
@@ -253,14 +253,14 @@ fn rename_reference(
         return None;
     }
 
-    Some(RangeInfo::new(range, SourceChange::source_file_edits("Rename", edit)))
+    Some(RangeInfo::new(range, SourceChange::source_file_edits(edit)))
 }
 
 #[cfg(test)]
 mod tests {
     use insta::assert_debug_snapshot;
     use ra_text_edit::TextEditBuilder;
-    use test_utils::{assert_eq_text, covers};
+    use test_utils::{assert_eq_text, mark};
 
     use crate::{
         mock_analysis::analysis_and_position, mock_analysis::single_file_with_position, FileId,
@@ -492,7 +492,7 @@ mod tests {
 
     #[test]
     fn test_rename_struct_field_for_shorthand() {
-        covers!(test_rename_struct_field_for_shorthand);
+        mark::check!(test_rename_struct_field_for_shorthand);
         test_rename(
             r#"
     struct Foo {
@@ -522,7 +522,7 @@ mod tests {
 
     #[test]
     fn test_rename_local_for_field_shorthand() {
-        covers!(test_rename_local_for_field_shorthand);
+        mark::check!(test_rename_local_for_field_shorthand);
         test_rename(
             r#"
     struct Foo {
@@ -642,7 +642,6 @@ mod tests {
             RangeInfo {
                 range: 4..7,
                 info: SourceChange {
-                    label: "Rename",
                     source_file_edits: [
                         SourceFileEdit {
                             file_id: FileId(
@@ -669,7 +668,7 @@ mod tests {
                             dst_path: "bar/foo2.rs",
                         },
                     ],
-                    cursor_position: None,
+                    is_snippet: false,
                 },
             },
         )
@@ -694,7 +693,6 @@ mod tests {
             RangeInfo {
                 range: 4..7,
                 info: SourceChange {
-                    label: "Rename",
                     source_file_edits: [
                         SourceFileEdit {
                             file_id: FileId(
@@ -721,7 +719,7 @@ mod tests {
                             dst_path: "foo2/mod.rs",
                         },
                     ],
-                    cursor_position: None,
+                    is_snippet: false,
                 },
             },
         )
@@ -777,7 +775,6 @@ mod tests {
             RangeInfo {
                 range: 8..11,
                 info: SourceChange {
-                    label: "Rename",
                     source_file_edits: [
                         SourceFileEdit {
                             file_id: FileId(
@@ -817,7 +814,7 @@ mod tests {
                             dst_path: "bar/foo2.rs",
                         },
                     ],
-                    cursor_position: None,
+                    is_snippet: false,
                 },
             },
         )
@@ -983,8 +980,8 @@ mod tests {
         if let Some(change) = source_change {
             for edit in change.info.source_file_edits {
                 file_id = Some(edit.file_id);
-                for indel in edit.edit.as_indels() {
-                    text_edit_builder.replace(indel.delete, indel.insert.clone());
+                for indel in edit.edit.into_iter() {
+                    text_edit_builder.replace(indel.delete, indel.insert);
                 }
             }
         }
diff --git a/crates/ra_ide/src/runnables.rs b/crates/ra_ide/src/runnables.rs
index fa8a9d92c..131b8f307 100644
--- a/crates/ra_ide/src/runnables.rs
+++ b/crates/ra_ide/src/runnables.rs
@@ -1,6 +1,6 @@
 //! FIXME: write short doc here
 
-use hir::Semantics;
+use hir::{AsAssocItem, Semantics};
 use itertools::Itertools;
 use ra_ide_db::RootDatabase;
 use ra_syntax::{
@@ -65,14 +65,36 @@ fn runnable_fn(sema: &Semantics<RootDatabase>, fn_def: ast::FnDef) -> Option<Run
         RunnableKind::Bin
     } else {
         let test_id = if let Some(module) = sema.to_def(&fn_def).map(|def| def.module(sema.db)) {
-            let path = module
+            let def = sema.to_def(&fn_def)?;
+            let impl_trait_name =
+                def.as_assoc_item(sema.db).and_then(|assoc_item| {
+                    match assoc_item.container(sema.db) {
+                        hir::AssocItemContainer::Trait(trait_item) => {
+                            Some(trait_item.name(sema.db).to_string())
+                        }
+                        hir::AssocItemContainer::ImplDef(impl_def) => impl_def
+                            .target_ty(sema.db)
+                            .as_adt()
+                            .map(|adt| adt.name(sema.db).to_string()),
+                    }
+                });
+
+            let path_iter = module
                 .path_to_root(sema.db)
                 .into_iter()
                 .rev()
                 .filter_map(|it| it.name(sema.db))
-                .map(|name| name.to_string())
-                .chain(std::iter::once(name_string))
-                .join("::");
+                .map(|name| name.to_string());
+
+            let path = if let Some(impl_trait_name) = impl_trait_name {
+                path_iter
+                    .chain(std::iter::once(impl_trait_name))
+                    .chain(std::iter::once(name_string))
+                    .join("::")
+            } else {
+                path_iter.chain(std::iter::once(name_string)).join("::")
+            };
+
             TestId::Path(path)
         } else {
             TestId::Name(name_string)
@@ -238,6 +260,44 @@ mod tests {
     }
 
     #[test]
+    fn test_runnables_doc_test_in_impl() {
+        let (analysis, pos) = analysis_and_position(
+            r#"
+        //- /lib.rs
+        <|> //empty
+        fn main() {}
+
+        struct Data;
+        impl Data {
+            /// ```
+            /// let x = 5;
+            /// ```
+            fn foo() {}
+        }
+        "#,
+        );
+        let runnables = analysis.runnables(pos.file_id).unwrap();
+        assert_debug_snapshot!(&runnables,
+        @r###"
+        [
+            Runnable {
+                range: 1..21,
+                kind: Bin,
+            },
+            Runnable {
+                range: 51..105,
+                kind: DocTest {
+                    test_id: Path(
+                        "Data::foo",
+                    ),
+                },
+            },
+        ]
+        "###
+                );
+    }
+
+    #[test]
     fn test_runnables_module() {
         let (analysis, pos) = analysis_and_position(
             r#"
diff --git a/crates/ra_ide/src/test_utils.rs b/crates/ra_ide/src/test_utils.rs
deleted file mode 100644
index 48c8fd1f4..000000000
--- a/crates/ra_ide/src/test_utils.rs
+++ /dev/null
@@ -1,25 +0,0 @@
-//! FIXME: write short doc here
-
-use ra_syntax::{SourceFile, TextSize};
-use ra_text_edit::TextEdit;
-
-pub use test_utils::*;
-
-pub fn check_action<F: Fn(&SourceFile, TextSize) -> Option<TextEdit>>(
-    before: &str,
-    after: &str,
-    f: F,
-) {
-    let (before_cursor_pos, before) = extract_offset(before);
-    let file = SourceFile::parse(&before).ok().unwrap();
-    let result = f(&file, before_cursor_pos).expect("code action is not applicable");
-    let actual = {
-        let mut actual = before.to_string();
-        result.apply(&mut actual);
-        actual
-    };
-    let actual_cursor_pos =
-        result.apply_to_offset(before_cursor_pos).expect("cursor position is affected by the edit");
-    let actual = add_cursor(&actual, actual_cursor_pos);
-    assert_eq_text!(after, &actual);
-}
diff --git a/crates/ra_ide/src/typing.rs b/crates/ra_ide/src/typing.rs
index 6f04f0be4..39bb3b357 100644
--- a/crates/ra_ide/src/typing.rs
+++ b/crates/ra_ide/src/typing.rs
@@ -17,7 +17,7 @@ mod on_enter;
 
 use ra_db::{FilePosition, SourceDatabase};
 use ra_fmt::leading_indent;
-use ra_ide_db::{source_change::SingleFileChange, RootDatabase};
+use ra_ide_db::RootDatabase;
 use ra_syntax::{
     algo::find_node_at_offset,
     ast::{self, AstToken},
@@ -40,15 +40,11 @@ pub(crate) fn on_char_typed(
     assert!(TRIGGER_CHARS.contains(char_typed));
     let file = &db.parse(position.file_id).tree();
     assert_eq!(file.syntax().text().char_at(position.offset), Some(char_typed));
-    let single_file_change = on_char_typed_inner(file, position.offset, char_typed)?;
-    Some(single_file_change.into_source_change(position.file_id))
+    let text_edit = on_char_typed_inner(file, position.offset, char_typed)?;
+    Some(SourceChange::source_file_edit_from(position.file_id, text_edit))
 }
 
-fn on_char_typed_inner(
-    file: &SourceFile,
-    offset: TextSize,
-    char_typed: char,
-) -> Option<SingleFileChange> {
+fn on_char_typed_inner(file: &SourceFile, offset: TextSize, char_typed: char) -> Option<TextEdit> {
     assert!(TRIGGER_CHARS.contains(char_typed));
     match char_typed {
         '.' => on_dot_typed(file, offset),
@@ -61,7 +57,7 @@ fn on_char_typed_inner(
 /// Returns an edit which should be applied after `=` was typed. Primarily,
 /// this works when adding `let =`.
 // FIXME: use a snippet completion instead of this hack here.
-fn on_eq_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange> {
+fn on_eq_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
     assert_eq!(file.syntax().text().char_at(offset), Some('='));
     let let_stmt: ast::LetStmt = find_node_at_offset(file.syntax(), offset)?;
     if let_stmt.semicolon_token().is_some() {
@@ -79,15 +75,11 @@ fn on_eq_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange>
         return None;
     }
     let offset = let_stmt.syntax().text_range().end();
-    Some(SingleFileChange {
-        label: "add semicolon".to_string(),
-        edit: TextEdit::insert(offset, ";".to_string()),
-        cursor_position: None,
-    })
+    Some(TextEdit::insert(offset, ";".to_string()))
 }
 
 /// Returns an edit which should be applied when a dot ('.') is typed on a blank line, indenting the line appropriately.
-fn on_dot_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange> {
+fn on_dot_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
     assert_eq!(file.syntax().text().char_at(offset), Some('.'));
     let whitespace =
         file.syntax().token_at_offset(offset).left_biased().and_then(ast::Whitespace::cast)?;
@@ -108,15 +100,11 @@ fn on_dot_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange>
         return None;
     }
 
-    Some(SingleFileChange {
-        label: "reindent dot".to_string(),
-        edit: TextEdit::replace(TextRange::new(offset - current_indent_len, offset), target_indent),
-        cursor_position: Some(offset + target_indent_len - current_indent_len + TextSize::of('.')),
-    })
+    Some(TextEdit::replace(TextRange::new(offset - current_indent_len, offset), target_indent))
 }
 
 /// Adds a space after an arrow when `fn foo() { ... }` is turned into `fn foo() -> { ... }`
-fn on_arrow_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange> {
+fn on_arrow_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
     let file_text = file.syntax().text();
     assert_eq!(file_text.char_at(offset), Some('>'));
     let after_arrow = offset + TextSize::of('>');
@@ -127,11 +115,7 @@ fn on_arrow_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChang
         return None;
     }
 
-    Some(SingleFileChange {
-        label: "add space after return type".to_string(),
-        edit: TextEdit::insert(after_arrow, " ".to_string()),
-        cursor_position: Some(after_arrow),
-    })
+    Some(TextEdit::insert(after_arrow, " ".to_string()))
 }
 
 #[cfg(test)]
@@ -140,29 +124,23 @@ mod tests {
 
     use super::*;
 
-    fn do_type_char(char_typed: char, before: &str) -> Option<(String, SingleFileChange)> {
+    fn do_type_char(char_typed: char, before: &str) -> Option<String> {
         let (offset, before) = extract_offset(before);
         let edit = TextEdit::insert(offset, char_typed.to_string());
         let mut before = before.to_string();
         edit.apply(&mut before);
         let parse = SourceFile::parse(&before);
         on_char_typed_inner(&parse.tree(), offset, char_typed).map(|it| {
-            it.edit.apply(&mut before);
-            (before.to_string(), it)
+            it.apply(&mut before);
+            before.to_string()
         })
     }
 
     fn type_char(char_typed: char, before: &str, after: &str) {
-        let (actual, file_change) = do_type_char(char_typed, before)
+        let actual = do_type_char(char_typed, before)
             .unwrap_or_else(|| panic!("typing `{}` did nothing", char_typed));
 
-        if after.contains("<|>") {
-            let (offset, after) = extract_offset(after);
-            assert_eq_text!(&after, &actual);
-            assert_eq!(file_change.cursor_position, Some(offset))
-        } else {
-            assert_eq_text!(after, &actual);
-        }
+        assert_eq_text!(after, &actual);
     }
 
     fn type_char_noop(char_typed: char, before: &str) {
@@ -350,6 +328,6 @@ fn foo() {
 
     #[test]
     fn adds_space_after_return_type() {
-        type_char('>', "fn foo() -<|>{ 92 }", "fn foo() -><|> { 92 }")
+        type_char('>', "fn foo() -<|>{ 92 }", "fn foo() -> { 92 }")
     }
 }
diff --git a/crates/ra_ide/src/typing/on_enter.rs b/crates/ra_ide/src/typing/on_enter.rs
index 78a40cc94..e7d64b4f6 100644
--- a/crates/ra_ide/src/typing/on_enter.rs
+++ b/crates/ra_ide/src/typing/on_enter.rs
@@ -38,17 +38,12 @@ pub(crate) fn on_enter(db: &RootDatabase, position: FilePosition) -> Option<Sour
     }
 
     let indent = node_indent(&file, comment.syntax())?;
-    let inserted = format!("\n{}{} ", indent, prefix);
-    let cursor_position = position.offset + TextSize::of(&inserted);
+    let inserted = format!("\n{}{} $0", indent, prefix);
     let edit = TextEdit::insert(position.offset, inserted);
 
-    Some(
-        SourceChange::source_file_edit(
-            "On enter",
-            SourceFileEdit { edit, file_id: position.file_id },
-        )
-        .with_cursor(FilePosition { offset: cursor_position, file_id: position.file_id }),
-    )
+    let mut res = SourceChange::from(SourceFileEdit { edit, file_id: position.file_id });
+    res.is_snippet = true;
+    Some(res)
 }
 
 fn followed_by_comment(comment: &ast::Comment) -> bool {
@@ -84,7 +79,7 @@ fn node_indent(file: &SourceFile, token: &SyntaxToken) -> Option<SmolStr> {
 
 #[cfg(test)]
 mod tests {
-    use test_utils::{add_cursor, assert_eq_text, extract_offset};
+    use test_utils::{assert_eq_text, extract_offset};
 
     use crate::mock_analysis::single_file;
 
@@ -98,7 +93,6 @@ mod tests {
         assert_eq!(result.source_file_edits.len(), 1);
         let mut actual = before.to_string();
         result.source_file_edits[0].edit.apply(&mut actual);
-        let actual = add_cursor(&actual, result.cursor_position.unwrap().offset);
         Some(actual)
     }
 
@@ -121,7 +115,7 @@ fn foo() {
 ",
             r"
 /// Some docs
-/// <|>
+/// $0
 fn foo() {
 }
 ",
@@ -137,7 +131,7 @@ impl S {
             r"
 impl S {
     /// Some
-    /// <|> docs.
+    /// $0 docs.
     fn foo() {}
 }
 ",
@@ -151,7 +145,7 @@ fn foo() {
 ",
             r"
 ///
-/// <|> Some docs
+/// $0 Some docs
 fn foo() {
 }
 ",
@@ -175,7 +169,7 @@ fn main() {
             r"
 fn main() {
     // Fix
-    // <|> me
+    // $0 me
     let x = 1 + 1;
 }
 ",
@@ -195,7 +189,7 @@ fn main() {
             r"
 fn main() {
     // Fix
-    // <|>
+    // $0
     // me
     let x = 1 + 1;
 }