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A recent change to cmcstl2 led to two tests failing due to this bug: our valid expression checking in the context of a requires-expression wasn't catching that an expression of member function type can only appear as the function operand of a call expression. Fixed by using convert_to_void to do the same checking as a discarded-value expression. This patch also fixes 67825, which already had a testcase, but the testcase was testing for the wrong behavior. gcc/cp/ChangeLog 2020-04-04 Jason Merrill <jason@redhat.com> PR c++/67825 * constraint.cc (tsubst_valid_expression_requirement): Call convert_to_void.
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