Merge pull request #15 from jridgewell/PerformPromiseResolveThenable

Fix incorrect type in PerformPromiseResolveThenable

Author: mgaudet

spec.emu

@@ -150,14 +150,17 @@ This spec text is not reviewed yet and may have issues.
       PerformPromiseResolveThenable (
         _promiseToResolve_: a Promise,
         _thenable_: an Object,
-        _then_: a JobCallback Record,
+        _then_: a JobCallback Record or a function object,
       ): either a normal completion containing *undefined* or a throw completion
     </h1>
     <dl class="header">
     </dl>
     <emu-alg>
       1. Let _resolvingFunctions_ be CreateResolvingFunctions(_promiseToResolve_).
-      1. Let _thenCallResult_ be Completion(HostCallJobCallback(_then_, _thenable_, « _resolvingFunctions_.[[Resolve]], _resolvingFunctions_.[[Reject]] »)).
+      1. If _then_ is a function object, then
+        1. Let _thenCallResult_ be Completion(Call(_then_, _thenable_, « _resolvingFunctions_.[[Resolve]], _resolvingFunctions_.[[Reject]] »)).
+      1. Else,
+        1. Let _thenCallResult_ be Completion(HostCallJobCallback(_then_, _thenable_, « _resolvingFunctions_.[[Resolve]], _resolvingFunctions_.[[Reject]] »)).
       1. If _thenCallResult_ is an abrupt completion, then
         1. Return ? Call(_resolvingFunctions_.[[Reject]], *undefined*, « _thenCallResult_.[[Value]] »).
       1. Return ! _thenCallResult_.