From 361a2d830aca1959d3dbc15d13bea31f89fcd0e2 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Thu, 23 Aug 2018 17:54:04 +0200
Subject: enforce the condition of a 'when' condition to be of type bool; refs
 #8603

---
 compiler/semexprs.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/semexprs.nim b/compiler/semexprs.nim
index 5a8c76216..5ff692fd5 100644
--- a/compiler/semexprs.nim
+++ b/compiler/semexprs.nim
@@ -2085,7 +2085,7 @@ proc semWhen(c: PContext, n: PNode, semCheck = true): PNode =
           typ = commonType(typ, it.sons[1].typ)
         result = n # when nimvm is not elimited until codegen
       else:
-        var e = semConstExpr(c, it.sons[0])
+        let e = forceBool(c, semConstExpr(c, it.sons[0]))
         if e.kind != nkIntLit:
           # can happen for cascading errors, assume false
           # InternalError(n.info, "semWhen")
-- 
cgit 1.4.1-2-gfad0