From 81125e2029fdd0d3a9c2931b066bfb72406a21ae Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Thu, 17 Oct 2019 20:02:59 +0200
Subject: [PATCH] [backport] add back a check that got accidentically removed;
 fixes #12379 (#12444)

---
 compiler/semtypes.nim | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/compiler/semtypes.nim b/compiler/semtypes.nim
index 896db5c3c..186161169 100644
--- a/compiler/semtypes.nim
+++ b/compiler/semtypes.nim
@@ -635,6 +635,12 @@ proc semRecordCase(c: PContext, n: PNode, check: var IntSet, pos: var int,
     errorUndeclaredIdentifier(c, n.sons[0].info, typ.sym.name.s)
   elif not isOrdinalType(typ):
     localError(c.config, n.sons[0].info, "selector must be of an ordinal type, float or string")
+  elif firstOrd(c.config, typ) != 0:
+    localError(c.config, n.info, "low(" & $a.sons[0].sym.name.s &
+                                     ") must be 0 for discriminant")
+  elif lengthOrd(c.config, typ) > 0x00007FFF:
+    localError(c.config, n.info, "len($1) must be less than 32768" % a.sons[0].sym.name.s)
+
   for i in 1 ..< len(n):
     var b = copyTree(n.sons[i])
     addSon(a, b)