1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/macros/metavar-expressions/count-empty-index-arg.rs b/tests/ui/macros/metavar-expressions/count-empty-index-arg.rs
new file mode 100644
index 00000000000..69880ee7fa9
--- /dev/null
+++ b/tests/ui/macros/metavar-expressions/count-empty-index-arg.rs
@@ -0,0 +1,16 @@
+// Issue: https://github.com/rust-lang/rust/issues/111904
+// Ensure that a trailing `,` is not interpreted as a `0`.
+
+#![feature(macro_metavar_expr)]
+
+macro_rules! foo {
+    ( $( $($t:ident),* );* ) => { ${count($t,)} }
+    //~^ ERROR `count` followed by a comma must have an associated
+    //~| ERROR expected expression, found `$`
+}
+
+fn test() {
+    foo!(a, a; b, b);
+}
+
+fn main() {}