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Fix PR c++/60573 PR c++/60573 * name-lookup.h (cp_binding_level): New transient field defining_class_p to indicate whether a scope is in the process of defining a class. * semantics.c (begin_class_definition): Set defining_class_p. * name-lookup.c (leave_scope): Reset defining_class_p. * parser.c (synthesize_implicit_template_parm): Use cp_binding_level:: defining_class_p rather than TYPE_BEING_DEFINED as the predicate for unwinding to class-defining scope to handle the erroneous definition of a generic function of an arbitrarily nested class within an enclosing class. PR c++/60573 * g++.dg/cpp1y/pr60573.C: New testcase. From-SVN: r208921
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