Issue 11892. It is compile-time error when unqualified invocation with unresolved identifier.

editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticWarningCodeTest.java

 /*
  * Copyright (c) 2013, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
  * or implied. See the License for the specific language governing permissions and limitations under
  * the License.
  */
 package com.google.dart.engine.resolver;
 
 import com.google.dart.engine.error.CompileTimeErrorCode;
 import com.google.dart.engine.error.HintCode;
-import com.google.dart.engine.error.StaticTypeWarningCode;
 import com.google.dart.engine.error.StaticWarningCode;
 import com.google.dart.engine.source.Source;
 
 public class StaticWarningCodeTest extends ResolverTestCase {
   // TODO(scheglov) requires fix for TypeVariableTypeImpl.isSubtypeOf()
   public void fail_argumentTypeNotAssignable_invocation_functionParameter_generic()
       throws Exception {
     Source source = addSource(createSource(//
         "class A<K, V> {",
         "  m(f(K k), V v) {",
@@ skipping 152 matching lines @@
     addSource("/lib1.dart", createSource(//
         "library lib1;",
         "class N {}"));
     addSource("/lib2.dart", createSource(//
         "library lib2;",
         "class N {}"));
     resolve(source);
     assertErrors(StaticWarningCode.AMBIGUOUS_IMPORT, CompileTimeErrorCode.EXTENDS_NON_CLASS);
   }
 
-  public void test_ambiguousImport_function() throws Exception {
-    Source source = addSource(createSource(//
-        "import 'lib1.dart';",
-        "import 'lib2.dart';",
-        "g() { return f(); }"));
-    addSource("/lib1.dart", createSource(//
-        "library lib1;",
-        "f() {}"));
-    addSource("/lib2.dart", createSource(//
-        "library lib2;",
-        "f() {}"));
-    resolve(source);
-    assertErrors(StaticWarningCode.AMBIGUOUS_IMPORT, StaticTypeWarningCode.UNDEFINED_FUNCTION);
-  }
-
   public void test_ambiguousImport_implements() throws Exception {
     Source source = addSource(createSource(//
         "import 'lib1.dart';",
         "import 'lib2.dart';",
         "class A implements N {}"));
     addSource("/lib1.dart", createSource(//
         "library lib1;",
         "class N {}"));
     addSource("/lib2.dart", createSource(//
         "library lib2;",
@@ skipping 1860 matching lines @@
     Source source = addSource(createSource(//
         "f({a, b}) {}",
         "main() {",
         "  f(c: 1);",
         "}"));
     resolve(source);
     assertErrors(StaticWarningCode.UNDEFINED_NAMED_PARAMETER);
     // no verify(), 'c' is not resolved
   }
 }