From 212c55d5bc3e87e3b1940502d55be9c2dcbf9326 Mon Sep 17 00:00:00 2001
From: Jason Zaugg <jzaugg@gmail.com>
Date: Mon, 28 Oct 2013 12:29:22 +0100
Subject: Microptimization in implicit search

Avoid creating a throwaway list of parameter types.
---
 src/compiler/scala/tools/nsc/typechecker/Implicits.scala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/compiler/scala/tools/nsc/typechecker/Implicits.scala')

diff --git a/src/compiler/scala/tools/nsc/typechecker/Implicits.scala b/src/compiler/scala/tools/nsc/typechecker/Implicits.scala
index c19d861d23..987a3d2202 100644
--- a/src/compiler/scala/tools/nsc/typechecker/Implicits.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/Implicits.scala
@@ -216,7 +216,8 @@ trait Implicits {
       case NullaryMethodType(restpe) =>
         containsError(restpe)
       case mt @ MethodType(_, restpe) =>
-        (mt.paramTypes exists typeIsError) || containsError(restpe)
+        // OPT avoiding calling `mt.paramTypes` which creates a new list.
+        (mt.params exists symTypeIsError) || containsError(restpe)
       case _ =>
         tp.isError
     }
-- 
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