c++: redeclaring member of constrained class template [PR96830]
An out-of-line definition of a member of a constrained class template
needs to repeat the template's constraints, but it turns out we don't
verify anywhere that the two sets of constraints match. This patch
adds such a check to push_template_decl, nearby a similar consistency
check for the template parameter list lengths.
PR c++/96830
gcc/cp/ChangeLog:
* pt.cc (push_inline_template_parms_recursive): Set
TEMPLATE_PARMS_CONSTRAINTS.
(push_template_decl): For an out-of-line declaration, verify
constraints for each enclosing template scope match those of the
original template declaratation.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-class5.C: New test.
* g++.dg/cpp2a/concepts-class5a.C: New test.