1 files changed, 7 insertions, 0 deletions

diff --git a/rust/macros/tests/invalid/missing-argument.rs b/rust/macros/tests/invalid/missing-argument.rs
new file mode 100644
index 0000000..893d609
--- /dev/null
+++ b/rust/macros/tests/invalid/missing-argument.rs
@@ -0,0 +1,7 @@
+use macros::hashmap;
+use std::collections::HashMap;
+
+fn main() {
+    // an argument should come between each pair of commas
+    let _hm: HashMap<_, _> = hashmap!('a' => 1, , 'b' => 2);
+}