1 files changed, 22 insertions, 0 deletions
diff --git a/tests/isolate/tisolate2.nim b/tests/isolate/tisolate2.nim
new file mode 100644
index 000000000..9bf92d82e
--- /dev/null
+++ b/tests/isolate/tisolate2.nim
@@ -0,0 +1,22 @@
+discard """
+  errormsg: "expression cannot be isolated: a_to_b(a)"
+  line: 22
+"""
+
+# bug #19013
+import std/isolation
+
+type Z = ref object
+  i: int
+
+type A = object
+  z: Z
+
+type B = object
+  z: Z
+
+func a_to_b(a: A): B =
+  result = B(z: a.z)
+
+let a = A(z: Z(i: 3))
+let b = isolate(a_to_b(a))