c++: ICE with bogus late return type [PR99803]
Here we ICE when compiling this code in C++20, because we're trying to slam a 'typename' after the ->. The cp_parser_template_id call just before the spot I'm changing parsed A::template A<int> as a BASELINK that contains a constructor, but make_typename_type crashes on that. This patch makes make_typename_type more robust instead of checking for is_overloaded_fn prior calling it. gcc/cp/ChangeLog: PR c++/99803 * decl.c (make_typename_type): Give an error and return when name is is_overloaded_fn. * parser.c (cp_parser_class_name): Don't check is_overloaded_fn before calling make_typename_type. gcc/testsuite/ChangeLog: PR c++/99803 * g++.dg/cpp2a/typename14.C: Don't expect particular error messages. * g++.dg/cpp2a/typename19.C: New test.
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@ -4055,6 +4055,12 @@ make_typename_type (tree context, tree name, enum tag_types tag_type,
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error ("%qD used without template arguments", name);
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return error_mark_node;
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}
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else if (is_overloaded_fn (name))
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{
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if (complain & tf_error)
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error ("%qD is a function, not a type", name);
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return error_mark_node;
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}
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gcc_assert (identifier_p (name));
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gcc_assert (TYPE_P (context));
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@ -24730,9 +24730,7 @@ cp_parser_class_name (cp_parser *parser,
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decl = cp_parser_maybe_treat_template_as_class (decl, class_head_p);
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/* If this is a typename, create a TYPENAME_TYPE. */
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if (typename_p
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&& decl != error_mark_node
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&& !is_overloaded_fn (decl))
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if (typename_p && decl != error_mark_node)
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{
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decl = make_typename_type (scope, decl, typename_type,
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/*complain=*/tf_error);
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@ -8,7 +8,7 @@ template<typename> struct A
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template<typename T>
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template<typename U>
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A<T>::A<U> () // { dg-error "partial specialization" }
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A<T>::A<U> () // { dg-error "" }
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{
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}
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@ -19,7 +19,7 @@ template<typename> struct B
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template<typename T>
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template<typename U>
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B<T>::foo<int>(int) // { dg-error "partial specialization|declaration" }
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B<T>::foo<int>(int) // { dg-error "" }
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{
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return 1;
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}
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@ -0,0 +1,5 @@
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// PR c++/99803
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// { dg-do compile { target c++20 } }
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struct A { template<typename T> A(T); };
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auto A(unsigned) -> A::template A<int>; // { dg-error "not a type" }
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