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After r16-7491, the constraint on a C auto... tparm is represented as a fold-expression (in TEMPLATE_PARM_CONSTRAINTS) instead of a concept-id (in PLACEHOLDER_TYPE_CONSTRAINTS). So we now need to strip this fold-expression before calling write_type_constraint, like we do in the type template parameter case a few lines below. PR c++/124297 gcc/cp/ChangeLog: * mangle.cc (write_template_param_decl) <case PARM_DECL>: Strip fold-expression before calling write_type_constraint. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/concepts-variadic4.C: New test. Reviewed-by: Jason Merrill <jason@redhat.com>
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