fixes #12092

tests/destructor/tdestructor_too_late.nim

@@ -0,0 +1,14 @@
+discard """
+  errmsg: "cannot bind another '=destroy' to: Obj; previous declaration was constructed here implicitly: tdestructor_too_late.nim(7, 16)"
+"""
+type Obj* = object
+  v*: int
+
+proc something(this: sink Obj) = 
+  discard
+
+proc `=destroy`(this: var Obj) =
+  echo "igotdestroyed"
+  this.v = -1
+
+var test* = Obj(v: 42)