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When updating an auto return type of an abbreviated function template in splice_late_return_type, we should also propagate PLACEHOLDER_TYPE_CONSTRAINTS (and cv-qualifiers) of the original auto node. gcc/cp/ChangeLog: PR c++/92187 * pt.c (splice_late_return_type): Propagate cv-qualifiers and PLACEHOLDER_TYPE_CONSTRAINTS from the original auto node to the new one. gcc/testsuite/ChangeLog: PR c++/92187 * g++.dg/concepts/abbrev5.C: New test. * g++.dg/concepts/abbrev6.C: New test.
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