1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/cpp23/auto-fncast3.C b/gcc/testsuite/g++.dg/cpp23/auto-fncast3.C
new file mode 100644
index 0000000..1204458
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp23/auto-fncast3.C
@@ -0,0 +1,21 @@
+// PR c++/103049
+// P0849R8 - auto(x)
+// { dg-do compile { target c++23 } }
+// Test invalid use.
+
+void
+f ()
+{
+  char x[] = "foo";
+  +decltype(auto){x}; // { dg-error "invalid use of .decltype\\(auto\\)." }
+  +decltype(auto)(x); // { dg-error "invalid use of .decltype\\(auto\\)." }
+
+  +auto(); // { dg-error "invalid use of .auto." }
+  new auto(); // { dg-error "requires exactly one element" }
+  +auto{}; // { dg-error "invalid use of .auto." }
+  new auto{}; // { dg-error "requires exactly one element" }
+  +auto(1, 2); // { dg-error "invalid use of .auto." }
+  new auto(1, 2); // { dg-error "requires exactly one element" }
+  +auto{1, 2}; // { dg-error "too many initializers" }
+  new auto{1, 2}; // { dg-error "requires exactly one element" }
+}