From 80952cadaab41ab198a22be5f245eb2ea678ddfa Mon Sep 17 00:00:00 2001
From: Danil Yarantsev <tiberiumk12@gmail.com>
Date: Wed, 24 Jun 2020 23:32:01 +0300
Subject: Reject casts to builtin typeclasses (#14788)

* Closes #14231, closes #14452

* Merge test to tcast.nim
---
 compiler/semexprs.nim | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'compiler/semexprs.nim')

diff --git a/compiler/semexprs.nim b/compiler/semexprs.nim
index 6f267b4eb..a9d45615e 100644
--- a/compiler/semexprs.nim
+++ b/compiler/semexprs.nim
@@ -191,6 +191,8 @@ proc isCastable(conf: ConfigRef; dst, src: PType): bool =
     return false
   if skipTypes(src, abstractInst-{tyTypeDesc}).kind == tyTypeDesc:
     return false
+  if skipTypes(dst, abstractInst).kind == tyBuiltInTypeClass:
+    return false
   if conf.selectedGC in {gcArc, gcOrc}:
     let d = skipTypes(dst, abstractInst)
     let s = skipTypes(src, abstractInst)
-- 
cgit 1.4.1-2-gfad0