diff --git a/tests/effects/tlaxeffects.nim b/tests/effects/tlaxeffects.nim
new file mode 100644
index 000000000..7eedc372a
--- /dev/null
+++ b/tests/effects/tlaxeffects.nim
@@ -0,0 +1,11 @@
+discard """
+  cmd: "nim $target $options --legacy:laxEffects $file"
+"""
+
+
+type
+  Foo = object
+    bar: seq[Foo]
+
+proc `==`(a, b: Foo): bool =
+  a.bar == b.bar