refactor: remove internal error check in genMove

compiler/ccgexprs.nim

@@ -2842,9 +2842,6 @@ proc genMove(p: BProc; n: PNode; d: var TLoc) =
       var op = getAttachedOp(p.module.g.graph, n.typ, attachedWasMoved)
       if op == nil:
         resetLoc(p, a)
-      elif sfOverridden in op.flags:
-        internalError(p.config, n.info,
-          "overridden =wasMoved should be emitted by instantiated move")
       else:
         var b = initLocExpr(p, newSymNode(op))
         case skipTypes(a.t, abstractVar+{tyStatic}).kind

tests/destructor/twasmoved.nim

@@ -43,3 +43,20 @@ block:
 
   main()
 
+
+import std/threadpool
+
+block:
+  type Foo = object
+    data: string
+
+  proc `=wasMoved`(x: var Foo) =
+    discard
+
+  proc work(x: Foo) =
+    discard
+
+  var x = Foo(data: "hello")
+  spawn work(x)
+  sync()
+