Find diagnostic locations for use in new compiler API.

dart/frog/leg/ssa/builder.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.
 
 class Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
   SourceString mapOperatorToMethodName(Operator op) {
     String name = op.source.stringValue;
@@ skipping 836 matching lines @@
       if (nextConstructor === null) {
         // No super initializer found. Try to find the default constructor if
         // the class is not Object.
         ClassElement enclosingClass = constructor.enclosingElement;
         ClassElement superClass = enclosingClass.superclass;
         ClassElement objectElement = compiler.coreLibrary.find(Types.OBJECT);
         if (enclosingClass != objectElement) {
           assert(superClass !== null);
           assert(superClass.isResolved);
           nextConstructor = superClass.lookupConstructor(superClass.name);
-          if (nextConstructor === null &&
-              superClass.canHaveDefaultConstructor()) {
-            nextConstructor = superClass.getSynthesizedConstructor();
-          } else if (nextConstructor === null) {
+          if (nextConstructor === null) {
             compiler.internalError("no default constructor available");
           }
         }
       }
     }
     // Call the JavaScript constructor with the fields as argument.
     // TODO(floitsch,karlklose): move this code to ClassElement and share with
     //                           the emitter.
     List<HInstruction> constructorArguments = <HInstruction>[];
     ClassElement element = classElement;
@@ skipping 1618 matching lines @@
     // Normally, we would call [close] here. However, then we hit
     // another unimplemented feature: aborting loop body. Simply
     // calling [add] does not work as it asserts that the instruction
     // isn't a control flow instruction. So we inline parts of [add].
     current.addAfter(current.last, new HThrow(message));
     if (isExpression) {
       stack.add(graph.addConstantNull());
     }
   }
 }