1 files changed, 20 insertions, 0 deletions
diff --git a/tests/objects/tobject.nim b/tests/objects/tobject.nim
index 61ef7442e..fbf531c3d 100644
--- a/tests/objects/tobject.nim
+++ b/tests/objects/tobject.nim
@@ -17,3 +17,23 @@ suite "object basic methods":
     check($obj == "(foo: 1)")
   test "it should test equality based on fields":
     check(makeObj(1) == makeObj(1))
+
+# bug #10203
+
+type
+  TMyObj = TYourObj
+  TYourObj = object of RootObj
+    x, y: int
+
+proc init: TYourObj =
+  result.x = 0
+  result.y = -1
+
+proc f(x: var TYourObj) =
+  discard
+
+var m: TMyObj = init()
+f(m)
+
+var a: TYourObj = m
+var b: TMyObj = a