From 2ac3ba713b61e4e6b70c98da59dc05925f8b5e6b Mon Sep 17 00:00:00 2001
From: flywind <xzsflywind@gmail.com>
Date: Wed, 13 Oct 2021 20:57:25 +0800
Subject: [PATCH] fix #18985 (#18988)

---
 compiler/semtypes.nim | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/compiler/semtypes.nim b/compiler/semtypes.nim
index 9f7a17a53b..d03fa88a8a 100644
--- a/compiler/semtypes.nim
+++ b/compiler/semtypes.nim
@@ -2076,7 +2076,10 @@ proc processMagicType(c: PContext, m: PSym) =
     setMagicType(c.config, m, tySequence, szUncomputedSize)
     if optSeqDestructors in c.config.globalOptions:
       incl m.typ.flags, tfHasAsgn
-    assert c.graph.sysTypes[tySequence] == nil
+    if defined(nimsuggest) or c.config.cmd == cmdCheck: # bug #18985
+      discard
+    else:
+      assert c.graph.sysTypes[tySequence] == nil
     c.graph.sysTypes[tySequence] = m.typ
   of mOrdinal:
     setMagicIntegral(c.config, m, tyOrdinal, szUncomputedSize)