Promise spec compliance: check that PromiseCapability used @@create.

This updates our implementation as per https://bugs.ecmascript.org/show_bug.cgi?id=2478 and domenic/promises-unwrapping@dcbc03c
paulmillr · Mar 3, 2014 · f922b1f · f922b1f
1 parent 6d65613
commit f922b1f
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/es6-shim.js b/es6-shim.js
@@ -1093,6 +1093,10 @@
           capability.reject = reject;
         };
         capability.promise = ES.Construct(C, [resolver]);
+        // see https://bugs.ecmascript.org/show_bug.cgi?id=2478
+        if (!capability.promise._es6construct) {
+          throw new TypeError('bad promise constructor');
+        }
         if (!(ES.IsCallable(capability.resolve) &&
               ES.IsCallable(capability.reject))) {
           throw new TypeError('bad promise constructor');