[PATCH] c++: mark_single_function and SFINAE [PR108282]

[Patrick Palka <ppalka@redhat.com>]

We typically ignore mark_used failure when in a non-SFINAE context for
sake of better error recovery.  But in mark_single_function we're
instead ignoring mark_used failure in a SFINAE context, which ends up
causing the second static_assert here to incorrectly fail.

Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for
trunk/12?

	PR c++/108282

gcc/cp/ChangeLog:

	* decl2.cc (mark_single_function): Ignore mark_used failure
	only in a non-SFINAE context rather than in a SFINAE one.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp2a/concepts-requires34.C: New test.
---
 gcc/cp/decl2.cc                               |  2 +-
 .../g++.dg/cpp2a/concepts-requires34.C        | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/cpp2a/concepts-requires34.C

diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
index f95529a5c9a..00ed64d1691 100644
--- a/gcc/cp/decl2.cc
+++ b/gcc/cp/decl2.cc
@@ -5600,7 +5600,7 @@ mark_single_function (tree expr, tsubst_flags_t complain)
 
   if (is_overloaded_fn (expr) == 1
       && !mark_used (expr, complain)
-      && (complain & tf_error))
+      && !(complain & tf_error))
     return false;
   return true;
 }
diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-requires34.C b/gcc/testsuite/g++.dg/cpp2a/concepts-requires34.C
new file mode 100644
index 00000000000..670a6dab31a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-requires34.C
@@ -0,0 +1,19 @@
+// PR c++/108282
+// { dg-do compile { target c++20 } }
+
+template<class T>
+concept TEST = requires { T::TT; };
+
+struct C { };
+
+template<class AT>
+struct B {
+  static inline void TT() requires TEST<AT>;
+};
+
+int main() {
+  static_assert( !TEST<C> );
+  static_assert( !TEST<B<C>> );
+
+  B<C>::TT();  // { dg-error "no match" }
+}
-- 
2.39.0.158.g2b4f5a4e4b