Eliminate internal compiler error when invoking a function type alias by mistake

tests/language/illegal_invocation_test.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// Dart test program for constructors and initializers.
+//
+// Test for issue 1393.  Invoking a type alias or library prefix name caused
+// an internal error in dartc
+//
+#import("illegal_invocation_lib.dart", prefix:"foo");  /// 02: compile-time error
+
+typedef void a();                 /// 01: compile-time error
+
+class Foo {}                      /// 04: compile-time error
+
+class Bar<T> {
+  method() {
+    T();                          /// 05: compile-time error
+  }
+}
+
+main() {
+  a();                           /// 01: continued
+
+  // probably what the user meant was foo.foo(), but the qualifier refers
+  // to the library prefix, not the method defined within the library.
+  foo();                         /// 02: continued
+
+  outer: for (int i =0 ; i < 1; i++) {
+    outer();                     /// 03: compile-time error
+  }
+
+  Foo();                         /// 04: continued
+
+  var bar = new Bar<int>();
+  bar.method();                  /// 05: continued
+}