Comment #56 on issue 3093 by [email protected]: Debugging promises
http://code.google.com/p/v8/issues/detail?id=3093

#51 works fine in V8, with a small twist:
the first then actually adds a default reject handler, as it's not provided as second argument. That default reject handler simply passes the rejection to the chained promise, which eventually triggers an uncaught exception debug event caused by rejection. Only that event happens when the default reject handler passes the rejection on. That is in the internal JS implementation, and the stack frame is not exposed. With no stack frame at all, the debug event is ignored by devtools.

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