Throw NoSuchMethod or IllegalArgument on bad operators or bad arguments to

tests/language/src/StringConcatTest.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.
 // String concatenation test.
 
 interface V {
   static final Version = "7.3.5.3";
 }
 
 
@@ skipping 27 matching lines @@
     // Adding a string to a number is not supported.
     try {
       String cantDo = x + " should't work";  // throws noSuchMethodException.
       Expect.equals(1, 0);  // this should never be executed.
     } catch(NoSuchMethodException e) {
       // In default mode.
       nofExceptions++;
     } catch (TypeError e) {
       // In type checked mode.
       nofExceptions++;
+    } catch (IllegalArgumentException e) {
+      // TODO(floitsch): IllegalArgumentException might not be correct.

[kasperl, 2012/02/15 11:54:49]

Maybe explain this one a bit better? Is the string concatenation operator
throwing the wrong argument? I guess so.

[floitsch, 2012/02/15 13:11:43]

Done.

+      nofExceptions++;
     }
 
     // Check that compile time constants are canonicalized.
     // TODO(hausner): Add more examples once we concatenate
     // CT constants other than string literals at compile time.
     var fake = "Milli" + " " + "Vanilli";
     Expect.equals(fake, "Milli Vanilli");
     Expect.equals(true, fake === "Milli Vanilli");
     Expect.equals(true, fake === "Milli " + 'Vanilli');
 
     Expect.equals(nofExceptions, 1);
   }
 }
 
 main() {
   StringConcatTest.testMain();
 }