Fix for 11987.

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

Index: editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
diff --git a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
index 465a9e1b78d1a33e04020b3e04c1112a4dd6a332..7bd91fca515ae6b904f02ea15f146a8635a12c79 100644
--- a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
+++ b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
@@ -15,6 +15,7 @@ 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.parser.ParserErrorCode;
 import com.google.dart.engine.source.Source;
@@ -3324,6 +3325,22 @@ public class CompileTimeErrorCodeTest extends ResolverTestCase {
     verify(source);
   }
 
+  public void test_typeAliasCannotReferenceItself_11987() throws Exception {
+    Source source = addSource(createSource(//
+        "typedef void F(List<G> l);",
+        "typedef void G(List<F> l);",
+        "main() {",
+        "  F foo(G g) => g;",
+        "}"));
+    resolve(source);
+    assertErrors(
+        source,
+        CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF,
+        CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF,
+        StaticTypeWarningCode.RETURN_OF_INVALID_TYPE);
+    verify(source);
+  }
+
   public void test_typeAliasCannotReferenceItself_parameterType_named() throws Exception {
     Source source = addSource(createSource(//
     "typedef A({A a});"));