helper<token>::c isn't dependent just because we haven't deduced its return
type yet. type_dependent_expression_p already knows how to deal with that
for bare FUNCTION_DECL, but needs to learn to look through a BASELINK.
PR c++/105964
gcc/cp/ChangeLog:
* pt.cc (type_dependent_expression_p): Look through BASELINK.
gcc/testsuite/ChangeLog:
* g++.dg/cpp1z/nontype-auto21.C: New test.
&& DECL_INITIAL (expression))
return true;
+ /* Pull a FUNCTION_DECL out of a BASELINK if we can. */
+ if (BASELINK_P (expression))
+ {
+ if (BASELINK_OPTYPE (expression)
+ && dependent_type_p (BASELINK_OPTYPE (expression)))
+ return true;
+ expression = BASELINK_FUNCTIONS (expression);
+ }
+
/* A function or variable template-id is type-dependent if it has any
dependent template arguments. */
if (VAR_OR_FUNCTION_DECL_P (expression)
--- /dev/null
+// PR c++/105964
+// { dg-do compile { target c++17 } }
+
+struct token {};
+
+struct example {};
+
+template< typename >
+struct helper
+{
+ static constexpr auto c() { return 42; }
+};
+
+struct impostor_c
+{
+ template< typename T, auto= helper< T >::c >
+ static example func();
+};
+
+example c= impostor_c::func< token >();