Opt-in to generate code for compile-time error. Only supported for SSA.

pkg/compiler/lib/src/dart_backend/backend.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.
 
 part of dart_backend;
 
 // TODO(ahe): This class is simply wrong.  This backend should use
 // elements when it can, not AST nodes.  Perhaps a [Map<Element,
 // TreeElements>] is what is needed.
 class ElementAst {
@@ skipping 31 matching lines @@
 
   DartResolutionCallbacks resolutionCallbacks;
 
   final Set<ClassElement> usedTypeLiterals = new Set<ClassElement>();
 
   /// The set of visible platform classes that are implemented by instantiated
   /// user classes.
   final Set<ClassElement> _userImplementedPlatformClasses =
       new Set<ClassElement>();
 
-  bool get canHandleCompilationFailed => false;
+  bool enableCodegenWithErrorsIfSupported(Spannable node) {
+    compiler.reportHint(node,
+        MessageKind.GENERIC,
+        {'text': "Generation of code with compile time errors is not "
+                 "supported for dart2dart."});
+    return false;
+  }
 
   /**
    * Tells whether it is safe to remove type declarations from variables,
    * functions parameters. It becomes not safe if:
    * 1) TypeError is used somewhere in the code,
    * 2) The code has typedefs in right hand side of IS checks,
    * 3) The code has classes which extend typedefs, have type arguments typedefs
    *    or type variable bounds typedefs.
    * These restrictions can be less strict.
    */
@@ skipping 244 matching lines @@
               }
             });
           }
         }
       }
     }
 
   }
 
   @override
-  bool registerDeferredLoading(Spannable node, Registry registry) {
+  bool enableDeferredLoadingIfSupported(Spannable node, Registry registry) {
     // TODO(sigurdm): Implement deferred loading for dart2dart.
     compiler.reportWarning(node, MessageKind.DEFERRED_LIBRARY_DART_2_DART);
     return false;
   }
 }
 
 class DartResolutionCallbacks extends ResolutionCallbacks {
   final DartBackend backend;
 
   DartResolutionCallbacks(this.backend);
@@ skipping 189 matching lines @@
 class _ElementAstCreationContext implements ElementAstCreationContext {
   final Compiler compiler;
   final ConstantSystem constantSystem;
 
   _ElementAstCreationContext(this.compiler, this.constantSystem);
 
   DartTypes get dartTypes => compiler.types;
 
   InternalErrorFunction get internalError => compiler.internalError;
 }