SI-7624 Fix -feature warnings and build with -feature

I added a language.existential import to LazyCombiner.scala which
should not be necessary, but causes a spurious warning otherwise:

    scala/src/library/scala/collection/parallel/mutable/LazyCombiner.scala:33:
    warning: the existential type
        scala.collection.parallel.mutable.LazyCombiner[_$1,_$2,_$3] forSome {
          type _$1; type _$2; type _$3 <: scala.collection.generic.Growable[_$1] with scala.collection.generic.Sizing },
    which cannot be expressed by wildcards, should be enabled by making the implicit value scala.language.existentials visible.
    if (other.isInstanceOf[LazyCombiner[_, _, _]]) {
                       ^

I created ticket SI-7750 to track this issue.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/typechecker/Infer.scala b/src/compiler/scala/tools/nsc/typechecker/Infer.scala
index 06892053fa..8ca0d82e93 100644
--- a/src/compiler/scala/tools/nsc/typechecker/Infer.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/Infer.scala
@@ -700,7 +700,7 @@ trait Infer extends Checkable {
         tp nonPrivateMember nme.apply match {
           case NoSymbol                                 => tp
           case sym if !sym.isOverloaded && sym.isPublic => OverloadedType(tp, sym.alternatives)
-          case sym                                      => OverloadedType(tp, sym filter (_.isPublic) alternatives)
+          case sym                                      => OverloadedType(tp, sym.filter(_.isPublic).alternatives)
         }
     }