5 files changed, 63 insertions, 8 deletions

diff --git a/crates/ide_db/src/call_info.rs b/crates/ide_db/src/call_info.rs
index e583a52f4..bad277a95 100644
--- a/crates/ide_db/src/call_info.rs
+++ b/crates/ide_db/src/call_info.rs
@@ -4,8 +4,9 @@ use either::Either;
 use hir::{HasAttrs, HirDisplay, Semantics, Type};
 use stdx::format_to;
 use syntax::{
+    algo,
     ast::{self, ArgListOwner, NameOwner},
-    match_ast, AstNode, SyntaxNode, SyntaxToken, TextRange, TextSize,
+    match_ast, AstNode, Direction, SyntaxNode, SyntaxToken, TextRange, TextSize,
 };
 
 use crate::RootDatabase;
@@ -43,7 +44,12 @@ pub fn call_info(db: &RootDatabase, position: FilePosition) -> Option<CallInfo>
     let sema = Semantics::new(db);
     let file = sema.parse(position.file_id);
     let file = file.syntax();
-    let token = file.token_at_offset(position.offset).next()?;
+    let token = file
+        .token_at_offset(position.offset)
+        .left_biased()
+        // if the cursor is sandwiched between two space tokens and the call is unclosed
+        // this prevents us from leaving the CallExpression
+        .and_then(|tok| algo::skip_trivia_token(tok, Direction::Prev))?;
     let token = sema.descend_into_macros(token);
 
     let (callable, active_parameter) = call_info_impl(&sema, token)?;
diff --git a/crates/ide_db/src/call_info/tests.rs b/crates/ide_db/src/call_info/tests.rs
index 281a081a3..be1cc12de 100644
--- a/crates/ide_db/src/call_info/tests.rs
+++ b/crates/ide_db/src/call_info/tests.rs
@@ -522,3 +522,30 @@ fn main(f: fn(i32, f64) -> char) {
             "#]],
     )
 }
+
+#[test]
+fn call_info_for_unclosed_call() {
+    check(
+        r#"
+fn foo(foo: u32, bar: u32) {}
+fn main() {
+    foo($0
+}"#,
+        expect![[r#"
+            fn foo(foo: u32, bar: u32)
+            (<foo: u32>, bar: u32)
+        "#]],
+    );
+    // check with surrounding space
+    check(
+        r#"
+fn foo(foo: u32, bar: u32) {}
+fn main() {
+    foo( $0
+}"#,
+        expect![[r#"
+            fn foo(foo: u32, bar: u32)
+            (<foo: u32>, bar: u32)
+        "#]],
+    )
+}
diff --git a/crates/ide_db/src/helpers.rs b/crates/ide_db/src/helpers.rs
index 66798ea3a..83a665b37 100644
--- a/crates/ide_db/src/helpers.rs
+++ b/crates/ide_db/src/helpers.rs
@@ -113,6 +113,10 @@ impl FamousDefs<'_, '_> {
         self.find_module("core:iter")
     }
 
+    pub fn core_ops_Deref(&self) -> Option<Trait> {
+        self.find_trait("core:ops:Deref")
+    }
+
     fn find_trait(&self, path: &str) -> Option<Trait> {
         match self.find_def(path)? {
             hir::ScopeDef::ModuleDef(hir::ModuleDef::Trait(it)) => Some(it),
diff --git a/crates/ide_db/src/helpers/famous_defs_fixture.rs b/crates/ide_db/src/helpers/famous_defs_fixture.rs
index 4d79e064e..29ae12dcf 100644
--- a/crates/ide_db/src/helpers/famous_defs_fixture.rs
+++ b/crates/ide_db/src/helpers/famous_defs_fixture.rs
@@ -112,6 +112,12 @@ pub mod ops {
         type Output;
         extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
     }
+
+    #[lang = "deref"]
+    pub trait Deref {
+        type Target: ?Sized;
+        fn deref(&self) -> &Self::Target;
+    }
 }
 
 pub mod option {
@@ -141,3 +147,5 @@ mod return_keyword {}
 
 /// Docs for prim_str
 mod prim_str {}
+
+pub use core::ops;
\ No newline at end of file
diff --git a/crates/ide_db/src/helpers/import_assets.rs b/crates/ide_db/src/helpers/import_assets.rs
index 8ce648367..91d6a4665 100644
--- a/crates/ide_db/src/helpers/import_assets.rs
+++ b/crates/ide_db/src/helpers/import_assets.rs
@@ -436,6 +436,8 @@ fn trait_applicable_items(
     })
     .collect();
 
+    let related_dyn_traits =
+        trait_candidate.receiver_ty.applicable_inherent_traits(db).collect::<FxHashSet<_>>();
     let mut located_imports = FxHashSet::default();
 
     if trait_assoc_item {
@@ -451,12 +453,16 @@ fn trait_applicable_items(
                             return None;
                         }
                     }
+                    let located_trait = assoc.containing_trait(db)?;
+                    if related_dyn_traits.contains(&located_trait) {
+                        return None;
+                    }
 
-                    let item = ItemInNs::from(ModuleDef::from(assoc.containing_trait(db)?));
+                    let trait_item = ItemInNs::from(ModuleDef::from(located_trait));
                     let original_item = assoc_to_item(assoc);
                     located_imports.insert(LocatedImport::new(
-                        mod_path(item)?,
-                        item,
+                        mod_path(trait_item)?,
+                        trait_item,
                         original_item,
                         mod_path(original_item),
                     ));
@@ -473,11 +479,15 @@ fn trait_applicable_items(
             |_, function| {
                 let assoc = function.as_assoc_item(db)?;
                 if required_assoc_items.contains(&assoc) {
-                    let item = ItemInNs::from(ModuleDef::from(assoc.containing_trait(db)?));
+                    let located_trait = assoc.containing_trait(db)?;
+                    if related_dyn_traits.contains(&located_trait) {
+                        return None;
+                    }
+                    let trait_item = ItemInNs::from(ModuleDef::from(located_trait));
                     let original_item = assoc_to_item(assoc);
                     located_imports.insert(LocatedImport::new(
-                        mod_path(item)?,
-                        item,
+                        mod_path(trait_item)?,
+                        trait_item,
                         original_item,
                         mod_path(original_item),
                     ));