diff --git a/tests/error_propagation/tin_expression_in_when.nim b/tests/error_propagation/tin_expression_in_when.nim
new file mode 100644
index 0000000000..6e0080e8ee
--- /dev/null
+++ b/tests/error_propagation/tin_expression_in_when.nim
@@ -0,0 +1,7 @@
+discard """
+  errormsg: "undeclared identifier: 'missing'"
+"""
+
+var x = missing
+when x is int:
+  discard