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[C++ PATCH] Fix unexpanded pack error with auto-deduced functions (PR c++/68396)

From: Ryan Burn <rnickb731 at gmail dot com>
To: gcc-patches at gcc dot gnu dot org
Date: Thu, 19 Nov 2015 09:41:22 -0500
Subject: [C++ PATCH] Fix unexpanded pack error with auto-deduced functions (PR c++/68396)
Authentication-results: sourceware.org; auth=none

This fixes an issue where the return type of an auto-deduced function
gets classified as a parameter pack if it's called in a decltype
expression inside of a type expansion.

The solution is to turn off the predicate type_pack_expansion_p when
traversing a decltype expression to disable the classification of any
auto types as parameter packs.

Bootstrapped and regression tested on x86_64-linux

2015-11-19  Ryan Burn  <contact@rnburn.com>

       PR c++/68396
       * pt.c (find_parameter_packs_r): Add case statement to
         handle DECLTYPE_TYPE. When traversing the
         DECLTYPE_TYPE_EXPR, set type_pack_expansion_p to
         false

       * g++.dg/concepts/pr68396.C: New test

Attachment: pr68396.patch
Description: Binary data

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