Change string used to annotate static type issues to 'static type warning' in multitest

tests/language/src/StringInterpolationTest.dart

 // Copyright (c) 2011, 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.
 
 // Tests for string interpolation
 class StringInterpolationTest {
 
   StringInterpolationTest() {}
 
   static final int i = 1;
@@ skipping 37 matching lines @@
 
     // escaping $ - doesn't start the embedded expression
     Expect.equals("\$", "escaped     \${3+2}"[12]);
     Expect.equals("{", "escaped     \${3+2}"[13]);
     Expect.equals("3", "escaped     \${3+2}"[14]);
     Expect.equals("+", "escaped     \${3+2}"[15]);
     Expect.equals("2", "escaped     \${3+2}"[16]);
     Expect.equals("}", "escaped     \${3+2}"[17]);
 
     if (alwaysFalse) {
-      "${i.toHorse()}"; /// 01: static type error
+      "${i.toHorse()}"; /// 01: static type warning
     }
   }
 
   String embedParams(int z) {
     return "param = ${z}";
   }
 
   String embedSingleField() {
     return "j = ${j}";
   }
 
   String embedMultipleFields() {
     return "j = ${j}; k = ${k}";
   }
 }
 
 main() {
   StringInterpolationTest.testMain(false);
 }