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[PATCH] Check precondition for std::ssize(const Container&)

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: Thu, 31 Oct 2019 09:39:39 +0000
Subject: [PATCH] Check precondition for std::ssize(const Container&)

This precondition is the subject of a national body comment on the C++20
CD. This just adds a test to ensure we enforce the precondition.

Also move existing 24_iterator/range_access*.cc tests to a dedicated
directory for the [iterator.range] subclause.

	* testsuite/24_iterators/range_access*.cc: Move to ...
	* testsuite/24_iterators/range_access/range_access*.cc: ... here.
	* testsuite/24_iterators/range_access/range_access_cpp20_neg.cc: New
	test.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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