b76ffa9505
Because we search for new redexes while performing reductions, we can't always assert that a term is well-formed. In this case, it's not true that all invocations of a continuation will have the same number of arguments while we are in the middle of performing a dead parameter reduction. BUG= R=asgerf@google.com Review URL: https://codereview.chromium.org/1641073003 .