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Here we incorrectly deem the calls to func1, func2 and tmpl2 as ambiguous ahead of time ultimately because we mishandle dependence of a constrained member function from the current instantiation. In type_dependent_expression_p, we already consider dependence of a TEMPLATE_DECL's constraints (via uses_outer_template_parms), but neglect to do the same for a FUNCTION_DECL (such as that for func1). And in satisfy_declaration_constraints, we give up if _any_ template argument is dependent, but for non-dependent member functions from the current instantiation (such as func2 and tmpl2), we can and must check constraints as long as the innermost arguments aren't dependent. PR c++/105842 gcc/cp/ChangeLog: * constraint.cc (satisfy_declaration_constraints): Refine early exit test for argument dependence. * cp-tree.h (uses_outer_template_parms_in_constraints): Declare. * pt.cc (template_class_depth): Handle TI_TEMPLATE being a FIELD_DECL. (usse_outer_template_parms): Factor out constraint dependence test into ... (uses_outer_template_parms_in_constraints): ... here. (type_dependent_expression_p): Use it for FUNCTION_DECL. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/concepts-memtmpl6.C: New test. |
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