Throw NoSuchMethod or IllegalArgument on bad operators or bad arguments to

tests/language/src/StringConcatTest.dart

Index: tests/language/src/StringConcatTest.dart
diff --git a/tests/language/src/StringConcatTest.dart b/tests/language/src/StringConcatTest.dart
index fbc303df440a2f1a138469b359521d453f94a5e9..80fbddc57463142af31ddd4c412260be2c5daa7f 100644
--- a/tests/language/src/StringConcatTest.dart
+++ b/tests/language/src/StringConcatTest.dart
@@ -45,6 +45,9 @@ class StringConcatTest {
     } 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.