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[c++-concepts] constraint folding


Updating constraint parsing to match changes to spec. Constraints must
always left unfolded, even when non-dependent, until they are
evaluated.

2014-06-25  Andrew Sutton  <andrew.n.sutton@gmail.com>
        * gcc/cp/parser.c (cp_parser_requires_clause): Don't fold expressions
         when parsing a requires-clause.
        * gcc/cp/constraint.cc (reduce_requirements): Don't fold
         expressions during constraint normalization.

Andrew Sutton


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