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In 3.11.3.2 "Postfix Lookup", it says: The semantics of E?S are equivalent to for $a in E, $b in S return $a($b) , where E is an expression on the left of the postfix ? operator and ?S is the unary lookup operator described in 3.11.3.1 Unary Lookup. That last line (about ?S) is left over from when E?S was defined in terms of UnaryLookup, which it isn't any more, so delete it. The line before that (about E) is still true, but seems to be stating the obvious, so should either be deleted or made more useful.
Related bug 27536.
*** This bug has been marked as a duplicate of bug 27536 ***