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C++ PATCH for c++/80935, wrong error on lambda in C++17 mode

From: Jason Merrill <jason at redhat dot com>
To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Date: Tue, 29 Aug 2017 15:48:01 -0400
Subject: C++ PATCH for c++/80935, wrong error on lambda in C++17 mode
Authentication-results: sourceware.org; auth=none

In this testcase, trying to treat a lambda op() as a constexpr
function led to an inappropriate error; we should instead just decide
that it isn't constexpr after all.

This patch also tweaks a couple of other places to use
is_instantiation_of_constexpr and var_in_maybe_constexpr_fn
appropriately.

Tested x86_64-pc-linux-gnu, applying to trunk.

Attachment: 80935.diff
Description: Text document

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