Re-enable IDE features for incomplete impl blocs

crates/ra_hir_def/src/item_tree/lower.rs

@@ -450,8 +450,9 @@ impl Ctx {
 
         // We cannot use `assoc_items()` here as that does not include macro calls.
         let items = impl_def
-            .item_list()?
-            .items()
+            .item_list()
+            .into_iter()
+            .flat_map(|it| it.items())
             .filter_map(|item| {
                 self.collect_inner_items(item.syntax());
                 let assoc = self.lower_assoc_item(&item)?;

crates/ra_ide/src/completion/complete_unqualified_path.rs

@@ -638,4 +638,21 @@ fn f() {}
             expect![[""]],
         )
     }
+
+    #[test]
+    fn completes_type_or_trait_in_impl_block() {
+        check(
+            r#"
+trait MyTrait {}
+struct MyStruct {}
+
+impl My<|>
+"#,
+            expect![[r#"
+                st MyStruct
+                tt MyTrait
+                tp Self
+            "#]],
+        )
+    }
 }

crates/ra_ide/src/completion/completion_item.rs

@@ -58,7 +58,7 @@ pub struct CompletionItem {
     score: Option<CompletionScore>,
 }
 
-// We use custom debug for CompletionItem to make `insta`'s diffs more readable.
+// We use custom debug for CompletionItem to make snapshot tests more readable.
 impl fmt::Debug for CompletionItem {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let mut s = f.debug_struct("CompletionItem");