completions for function return type

pkg/analysis_server/lib/src/services/completion/optype.dart

Index: pkg/analysis_server/lib/src/services/completion/optype.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/optype.dart b/pkg/analysis_server/lib/src/services/completion/optype.dart
index 83e89f55e9d3e38d1ca301a882a385de6767c671..cba56957243a1931b1da0629605c3b439c36503d 100644
--- a/pkg/analysis_server/lib/src/services/completion/optype.dart
+++ b/pkg/analysis_server/lib/src/services/completion/optype.dart
@@ -184,7 +184,9 @@ class _OpTypeAstVisitor extends GeneralizingAstVisitor {
   }
 
   void visitCompilationUnit(CompilationUnit node) {
-    optype.includeTypeNameSuggestions = true;
+    if (entity is! CommentToken) {
+      optype.includeTypeNameSuggestions = true;
+    }
   }
 
   @override
@@ -310,6 +312,14 @@ class _OpTypeAstVisitor extends GeneralizingAstVisitor {
   }
 
   @override
+  void visitFunctionDeclaration(FunctionDeclaration node) {
+    if (identical(entity, node.returnType) ||
+        identical(entity, node.name) && node.returnType == null) {
+      optype.includeTypeNameSuggestions = true;
+    }
+  }
+
+  @override
   void visitFunctionTypeAlias(FunctionTypeAlias node) {
     if (identical(entity, node.returnType) ||
         identical(entity, node.name) && node.returnType == null) {