From 8e2a8db09680a4a5b715b02fa3491f683db9574d Mon Sep 17 00:00:00 2001
From: Martin Odersky <odersky@gmail.com>
Date: Mon, 19 Dec 2016 14:12:12 +0100
Subject: Make `msg` in testScala2Mode by-name.

Avoids potentially expensive string assembly operations.
---
 compiler/src/dotty/tools/dotc/core/TypeOps.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'compiler/src/dotty/tools/dotc/core/TypeOps.scala')

diff --git a/compiler/src/dotty/tools/dotc/core/TypeOps.scala b/compiler/src/dotty/tools/dotc/core/TypeOps.scala
index f134412a7..5f9263009 100644
--- a/compiler/src/dotty/tools/dotc/core/TypeOps.scala
+++ b/compiler/src/dotty/tools/dotc/core/TypeOps.scala
@@ -546,7 +546,7 @@ trait TypeOps { this: Context => // TODO: Make standalone object.
   def dynamicsEnabled =
     featureEnabled(defn.LanguageModuleClass, nme.dynamics)
 
-  def testScala2Mode(msg: String, pos: Position) = {
+  def testScala2Mode(msg: => String, pos: Position) = {
     if (scala2Mode) migrationWarning(msg, pos)
     scala2Mode
   }
-- 
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