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C++ PATCH for c++/78337 (ICE with invalid generic lambda)

From: Jason Merrill <jason at redhat dot com>
To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Date: Wed, 11 Jan 2017 16:39:35 -0500
Subject: C++ PATCH for c++/78337 (ICE with invalid generic lambda)
Authentication-results: sourceware.org; auth=none

We instantiate the return type of the lambda outside of the function
context, at which point trying to walk from the template instantiation
context up to the context of 'f' hits NULL_TREE.  So we should handle
that.

There was also a SFINAE issue whereby we skipped the error in SFINAE
context, but still gave the inform.

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

Attachment: 78337.diff
Description: Text document

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