[c++-concepts] Requires expr in non-templte

[Andrew Sutton]

This patch prevents the use of requires expressions in non-template
scopes. This restriction was relaxed in the most recent version of
concepts lite, but the implementation requires some thought. For now,
I am marking it an error to make it consistent with previous versions
of the spec.

2013-10-25  Andrew Sutton  <andrew.n.sut...@gmail.com>
        * gcc/cp/parsre.c (cp_parser_requires_expression): Gracefully
        fail when parsing a requires expr outside a template.

Andrew Sutton

template-requires.patch
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