From 1e88c3a67418ea93618e6223b0ea24b464c24c8c Mon Sep 17 00:00:00 2001
From: Nicolas Stucki <nicolas.stucki@gmail.com>
Date: Sun, 8 Oct 2017 20:38:26 +0200
Subject: [PATCH] Avoid closure creation in hot code

---
 compiler/src/dotty/tools/dotc/core/Flags.scala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/compiler/src/dotty/tools/dotc/core/Flags.scala b/compiler/src/dotty/tools/dotc/core/Flags.scala
index b5f9517250c1..784fd08a9b63 100644
--- a/compiler/src/dotty/tools/dotc/core/Flags.scala
+++ b/compiler/src/dotty/tools/dotc/core/Flags.scala
@@ -22,7 +22,8 @@ object Flags {
       else if (that.bits == 0) this
       else {
         val tbits = bits & that.bits & KINDFLAGS
-        assert(tbits != 0, s"illegal flagset combination: $this and $that")
+        if (tbits == 0)
+          assert(false, s"illegal flagset combination: $this and $that")
         FlagSet(tbits | ((this.bits | that.bits) & ~KINDFLAGS))
       }