diff --git a/ui-tests/mismatched_parens.nil b/ui-tests/mismatched_parens.nil
new file mode 100644
index 0000000..810f57b
--- /dev/null
+++ b/ui-tests/mismatched_parens.nil
@@ -0,0 +1 @@
+function main() = (
diff --git a/ui-tests/mismatched_parens.stderr b/ui-tests/mismatched_parens.stderr
new file mode 100644
index 0000000..d914e7a
--- /dev/null
+++ b/ui-tests/mismatched_parens.stderr
@@ -0,0 +1,4 @@
+error: unexpected end of file
+ --> $DIR/mismatched_parens.nil:2
+2 | 
+    ^