1 files changed, 7 insertions, 0 deletions
diff --git a/tests/ui/feature-gates/feature-gate-builtin_syntax.rs b/tests/ui/feature-gates/feature-gate-builtin_syntax.rs
new file mode 100644
index 00000000000..832bb5a96bc
--- /dev/null
+++ b/tests/ui/feature-gates/feature-gate-builtin_syntax.rs
@@ -0,0 +1,7 @@
+struct Foo {
+    v: u8,
+    w: u8,
+}
+fn main() {
+    builtin # offset_of(Foo, v); //~ ERROR `builtin #` syntax is unstable
+}