fixes #23129; fixes generated hooks raise unlisted Exception, which never raise (#23195)

fixes #23129

(cherry picked from commit 62c5b8b287)

compiler/liftdestructors.nim

@@ -1173,7 +1173,12 @@ proc produceSym(g: ModuleGraph; c: PContext; typ: PType; kind: TTypeAttachedOp;
         # bug #19205: Do not forget to also copy the hidden type field:
         genTypeFieldCopy(a, typ, result.ast[bodyPos], d, src)
 
-  if not a.canRaise: incl result.flags, sfNeverRaises
+  if not a.canRaise:
+    incl result.flags, sfNeverRaises
+    result.ast[pragmasPos] = newNodeI(nkPragma, info)
+    result.ast[pragmasPos].add newTree(nkExprColonExpr,
+        newIdentNode(g.cache.getIdent("raises"),  info), newNodeI(nkBracket, info))
+
   completePartialOp(g, idgen.module, typ, kind, result)
 
 

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")