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C++ PATCH for various small fixes

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 15:50:58 -0400
Subject: C++ PATCH for various small fixes
Authentication-results: sourceware.org; auth=none

Various small things I noticed while working on the lambda overhaul:

We try to avoid mentioning the lambda conversion static thunk in
diagnostics, but it was showing up in constexpr messages.

If the lambda itself is erroneous, don't try to build a closure object.

We can't defer instantiation of a function with undeduced auto type.

tsubst_decl should set the DECL_CONTEXT on function parameters immediately.

Don't build a non-type parameter with erroneous type.

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

Attachment: various.diff
Description: Text document

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