2 files changed, 17 insertions, 1 deletions
diff --git a/tests/effects/teffects1.nim b/tests/effects/teffects1.nim
index 49c904029..1d267b5fa 100644
--- a/tests/effects/teffects1.nim
+++ b/tests/effects/teffects1.nim
@@ -39,7 +39,7 @@ proc foo(x: int): string {.nimcall, raises: [ValueError].} =
 
 var p: MyProcType = foo #[tt.Error
                     ^
-type mismatch: got <proc (x: int): string{.nimcall, noSideEffect, gcsafe.}> but expected 'MyProcType = proc (x: int): string{.closure.}'
+type mismatch: got <proc (x: int): string{.nimcall, raises: [ValueError], noSideEffect, gcsafe.}> but expected 'MyProcType = proc (x: int): string{.closure.}'
   Calling convention mismatch: got '{.nimcall.}', but expected '{.closure.}'.
 .raise effects differ
 ]#
diff --git a/tests/effects/thooks.nim b/tests/effects/thooks.nim
new file mode 100644
index 000000000..23cc005cd
--- /dev/null
+++ b/tests/effects/thooks.nim
@@ -0,0 +1,16 @@
+discard """
+  matrix: "--warningAsError:Effect"
+"""
+
+import std/isolation
+
+# bug #23129
+type
+  Thing = object
+    x: string
+
+proc send(x: string) =
+  let wrapper = Thing(x: x)
+  discard isolate(wrapper)
+
+send("la")
\ No newline at end of file