Better reporting in tests

compiler/backend/src/org/jetbrains/jet/codegen/CompilationErrorHandler.java

@@ -7,10 +7,10 @@ public interface CompilationErrorHandler {
 
     CompilationErrorHandler THROW_EXCEPTION = new CompilationErrorHandler() {
         @Override
-        public void reportError(String message, String fileUrl) {
-            throw new IllegalStateException(message);
+        public void reportException(Throwable exception, String fileUrl) {
+            throw new IllegalStateException(exception);
         }
     };
 
-    void reportError(String message, String fileUrl);
+    void reportException(Throwable exception, String fileUrl);
 }

compiler/backend/src/org/jetbrains/jet/codegen/GenerationState.java

@@ -112,7 +112,7 @@ public class GenerationState {
                     generateNamespace(namespace);
                 }
                 catch (Throwable e) {
-                    errorHandler.reportError("Exception: " + e.getClass().getCanonicalName() + ": " + e.getMessage(), namespace.getContainingFile().getVirtualFile().getUrl());
+                    errorHandler.reportException(e, namespace.getContainingFile().getVirtualFile().getUrl());
                 }
             }
         }

idea/src/org/jetbrains/jet/plugin/compiler/JetCompiler.java

@@ -104,8 +104,8 @@ public class JetCompiler implements TranslatingCompiler {
                 if (!errors) {
                     generationState.compileCorrectNamespaces(bindingContext, namespaces, new CompilationErrorHandler() {
                         @Override
-                        public void reportError(String message, String fileUrl) {
-                            compileContext.addMessage(CompilerMessageCategory.WARNING, message, fileUrl, 0, 0);
+                        public void reportException(Throwable exception, String fileUrl) {
+                            compileContext.addMessage(CompilerMessageCategory.WARNING, exception.getClass().getCanonicalName() + ": " + exception.getMessage(), fileUrl, 0, 0);
                         }
                     });
 ///////////