Cache name for dummy argument used in implicit search

This avoids a minor inefficiency of interning the name on
each implicit candidate. Instead, we follow the usual practice
and use a pre-baked name from `StdNames`.

2 files changed, 2 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/typechecker/Implicits.scala b/src/compiler/scala/tools/nsc/typechecker/Implicits.scala
index 71558273a6..0861d58240 100644
--- a/src/compiler/scala/tools/nsc/typechecker/Implicits.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/Implicits.scala
@@ -609,7 +609,7 @@ trait Implicits {
         val itree2 = if (!isView) fallback else pt match {
           case Function1(arg1, arg2) =>
             typed1(
-              atPos(itree0.pos)(Apply(itree1, List(Ident("<argument>") setType approximate(arg1)))),
+              atPos(itree0.pos)(Apply(itree1, List(Ident(nme.argument) setType approximate(arg1)))),
               EXPRmode,
               approximate(arg2)
             ) match {
diff --git a/src/reflect/scala/reflect/internal/StdNames.scala b/src/reflect/scala/reflect/internal/StdNames.scala
index f32b7326fe..c0562b0679 100644
--- a/src/reflect/scala/reflect/internal/StdNames.scala
+++ b/src/reflect/scala/reflect/internal/StdNames.scala
@@ -1078,6 +1078,7 @@ trait StdNames {
     val reflPolyCacheName: NameType   = "reflPoly$Cache"
     val reflParamsCacheName: NameType = "reflParams$Cache"
     val reflMethodName: NameType      = "reflMethod$Method"
+    val argument: NameType            = "<argument>"
 
   }