Alex Lam S.L d9344f30b8 disallow parameter substitution for named IIFEs (#1596) ...

Self-referenced function has non-fixed values assigned to its parameters.

Let `unused` & `!keep_fnames` do the scanning, then apply `reduce_vars` only to unnamed functions.

fixes #1595

2017-03-11 03:34:55 +08:00

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