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[PATCH] Fixes PR c++/89913

From: Andrew Sutton <andrew dot n dot sutton at gmail dot com>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Fri, 15 Nov 2019 11:15:06 -0500
Subject: [PATCH] Fixes PR c++/89913

Avoid ICE when the alias is ill-formed.

 gcc/cp/
  * pt.c (get_underlying_template): Exit loop if the original type
of the alias is null.

gcc/testsuite/
  * g++.dg/cpp2a/pr89913.C: New test.

Andrew Sutton

Attachment: 0001-Don-t-segfault-on-error-PR-c-89913.patch
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