Change UNDEFINED_FUNCTION from an error to a warning (issues 18274, 15315).

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

Index: editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticTypeWarningCodeTest.java
diff --git a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticTypeWarningCodeTest.java b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticTypeWarningCodeTest.java
index c1e3fe22161d6c53ce2549cfca6e922aa21723f2..7af67604bbafbbb6fbab3f39e5f5a1d8ca8daf16 100644
--- a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticTypeWarningCodeTest.java
+++ b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticTypeWarningCodeTest.java
@@ -14,6 +14,7 @@
 package com.google.dart.engine.resolver;
 
 import com.google.dart.engine.error.StaticTypeWarningCode;
+import com.google.dart.engine.error.StaticWarningCode;
 import com.google.dart.engine.source.Source;
 
 public class StaticTypeWarningCodeTest extends ResolverTestCase {
@@ -26,6 +27,24 @@ public class StaticTypeWarningCodeTest extends ResolverTestCase {
     verify(source);
   }
 
+  public void test_ambiguousImport_function() throws Exception {
+    Source source = addSource(createSource(//
+        "import 'lib1.dart';",
+        "import 'lib2.dart';",
+        "g() { return f(); }"));
+    addNamedSource("/lib1.dart", createSource(//
+        "library lib1;",
+        "f() {}"));
+    addNamedSource("/lib2.dart", createSource(//
+        "library lib2;",
+        "f() {}"));
+    resolve(source);
+    assertErrors(
+        source,
+        StaticWarningCode.AMBIGUOUS_IMPORT,
+        StaticTypeWarningCode.UNDEFINED_FUNCTION);
+  }
+
   public void test_expectedOneListTypeArgument() throws Exception {
     Source source = addSource(createSource(//
         "main() {",
@@ -949,6 +968,47 @@ public class StaticTypeWarningCodeTest extends ResolverTestCase {
     assertErrors(source, StaticTypeWarningCode.UNDEFINED_GETTER);
   }
 
+  public void test_undefinedFunction() throws Exception {
+    Source source = addSource(createSource(//
+        "void f() {",
+        "  g();",
+        "}"));
+    resolve(source);
+    assertErrors(source, StaticTypeWarningCode.UNDEFINED_FUNCTION);
+  }
+
+  public void test_undefinedFunction_hasImportPrefix() throws Exception {
+    Source source = addSource(createSource(//
+        "import 'lib.dart' as f;",
+        "main() { return f(); }"));
+    addNamedSource("/lib.dart", "library lib;");
+    resolve(source);
+    assertErrors(source, StaticTypeWarningCode.UNDEFINED_FUNCTION);
+  }
+
+  public void test_undefinedFunction_inCatch() throws Exception {
+    Source source = addSource(createSource(//
+        "void f() {",
+        "  try {",
+        "  } on Object {",
+        "    g();",
+        "  }",
+        "}"));
+    resolve(source);
+    assertErrors(source, StaticTypeWarningCode.UNDEFINED_FUNCTION);
+  }
+
+  public void test_undefinedFunction_inImportedLib() throws Exception {
+    Source source = addSource(createSource(//
+        "import 'lib.dart' as f;",
+        "main() { return f.g(); }"));
+    addNamedSource("/lib.dart", createSource(//
+        "library lib;",
+        "h() {}"));
+    resolve(source);
+    assertErrors(source, StaticTypeWarningCode.UNDEFINED_FUNCTION);
+  }
+
   public void test_undefinedGetter() throws Exception {
     Source source = addSource(createSource(//
         "class T {}",