Eli Friedman 6fa17b43d3 Rewrite the improper_ctypes lint.
Makes the lint a bit more accurate, and improves the quality of the diagnostic
messages by explicitly returning an error message.

The new lint is also a little more aggressive: specifically, it now
rejects tuples, and it recurses into function pointers.
2015-07-23 17:03:04 -07:00
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