When we're substituting into a function parameter pack and expect to
get a function parameter pack (but don't due to weird substitutions),
complain. Fixes the last bit of PR11848.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148960 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed