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[committed] libstdc++: Remove workarounds for constraints on alias templates

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Wed, 5 Feb 2020 15:14:53 +0000
Subject: [committed] libstdc++: Remove workarounds for constraints on alias templates

The G++ bug has been fixed for a couple of months so we can remove these
workarounds that define alias templates in terms of constrained class
templates. We can just apply constraints directly to alias templates as
specified in the C++20 working draft.

	* include/bits/iterator_concepts.h (iter_reference_t)
	(iter_rvalue_reference_t, iter_common_reference_t, indirect_result_t):
	Remove workarounds for PR c++/67704.
	* testsuite/24_iterators/aliases.cc: New test.

Tested powerpc64le-linux, committed to master.

Attachment: patch.txt
Description: Text document

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