Emit a compile-time error when returning a value from a constructor.

sdk/lib/_internal/compiler/implementation/resolution/members.dart

Index: sdk/lib/_internal/compiler/implementation/resolution/members.dart
diff --git a/sdk/lib/_internal/compiler/implementation/resolution/members.dart b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
index 1f1c9493e33d3e0fee6c2e6ee4345ec35098de66..aca4608e3a976031939e4b2b60844cf9b84ffe5c 100644
--- a/sdk/lib/_internal/compiler/implementation/resolution/members.dart
+++ b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
@@ -2523,6 +2523,15 @@ class ResolverVisitor extends MappingVisitor<Element> {
     if (node.isRedirectingFactoryBody) {
       handleRedirectingFactoryBody(node);
     } else {
+      Node expression = node.expression;
+      if (expression != null &&
+          enclosingElement.isGenerativeConstructor()) {
+        // It is a compile-time error if a return statement of the form
+        // `return e;` appears in a generative constructor.  (Dart Language
+        // Specification 13.12.)
+        compiler.reportError(expression,
+                             MessageKind.CANNOT_RETURN_FROM_CONSTRUCTOR);
+      }
       visit(node.expression);
     }
   }