Remove unused imports and other minor cleanups

 - Language imports are preceding other imports
 - Deleted empty file: InlineErasure
 - Removed some unused private[parallel] methods in
   scala/collection/parallel/package.scala

This removes hundreds of warnings when compiling with
"-Xlint -Ywarn-dead-code -Ywarn-unused -Ywarn-unused-import".

1 files changed, 1 insertions, 2 deletions

diff --git a/src/compiler/scala/reflect/quasiquotes/Holes.scala b/src/compiler/scala/reflect/quasiquotes/Holes.scala
index 47084fc317..63be500061 100644
--- a/src/compiler/scala/reflect/quasiquotes/Holes.scala
+++ b/src/compiler/scala/reflect/quasiquotes/Holes.scala
@@ -1,7 +1,6 @@
 package scala.reflect
 package quasiquotes
 
-import scala.collection.{immutable, mutable}
 import scala.reflect.internal.Flags._
 import scala.reflect.macros.TypecheckException
 
@@ -222,7 +221,7 @@ trait Holes { self: Quasiquotes =>
       else if (rank == NoDot) Some(unlifter)
       else {
         val idx = records.indexWhere { p => p._1 =:= tpe && p._2 == rank }
-        val resIdx = if (idx != -1) idx else { records +:= (tpe, rank); records.length - 1}
+        val resIdx = if (idx != -1) idx else { records +:= ((tpe, rank)); records.length - 1}
         Some(Ident(TermName(nme.QUASIQUOTE_UNLIFT_HELPER + resIdx)))
       }
     }