[cfe-dev] [patch] Fix access computation of default arguments in template classes

[Nico Weber]

Hi,

the attached patch fixes http://http://llvm.org/pr8479 "clang
evaluates visibility of default parameters at the call site instead of
at parameter definition site".

The problem was that Sema::BuildCXXDefaultArgExpr didn't update the
current decl context before calling SubstExpr(), so that the default
parameter access was checked with the decl context of the template
instantiation site. Please review.

Nico
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