[cfe-commits] patch: improve diagnostic on "class T::iterator" where T::iterator is a typedef

[Nick Lewycky]

This patch fixes PR8755, a bug where we give a worse diagnostic when
templates are involved than when they aren't. In the case of "class
T<A>::iterator" we look up tag types only then error out when one isn't
found. The patch works by extended the error path to do a second lookup and
report a more informative error when a non-tag type is found.

Please review!

Nick
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