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In fn_type_unifcation, we are passing NULL_TREE as the 'in_decl' parameter to coerce_template_parms, and this is causing template type/value mismatch error messages to get suppressed regardless of the value of 'complain'. This means that when substitution into a function template fails due to a type/value mismatch between a template parameter and the provided template argument, we just say "template argument deduction/substitution failed:" without a followup explanation of the failure. Fix this by passing 'fn' instead of NULL_TREE to coerce_template_parms. gcc/cp/ChangeLog: PR c++/66439 * pt.c (fn_type_unification): Pass 'fn' instead of NULL_TREE as the 'in_decl' parameter to coerce_template_parms. gcc/testsuite/ChangeLog: PR c++/66439 * g++.dg/cpp2a/concepts-ts4.C: Expect a "type/value mismatch" diagnostic. * g++.dg/cpp2a/concepts-ts6.C: Likewise. * g++.dg/template/error56.C: Likewise. * g++.dg/template/error59.C: New test. libstdc++-v3/ChangeLog: PR c++/66439 * testsuite/20_util/pair/astuple/get_neg.cc: Prune "type/value mismatch" messages. * testsuite/20_util/tuple/element_access/get_neg.cc: Likewise.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.