diff options
| -rw-r--r-- | src/compiler/scala/tools/nsc/typechecker/Infer.scala | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/src/compiler/scala/tools/nsc/typechecker/Infer.scala b/src/compiler/scala/tools/nsc/typechecker/Infer.scala index e9383f19c6..66309115df 100644 --- a/src/compiler/scala/tools/nsc/typechecker/Infer.scala +++ b/src/compiler/scala/tools/nsc/typechecker/Infer.scala @@ -427,20 +427,19 @@ trait Infer extends Checkable { * by existentially bound variables. */ def makeFullyDefined(tp: Type): Type = { - val tparams = new ListBuffer[Symbol] + var tparams: List[Symbol] = Nil def addTypeParam(bounds: TypeBounds): Type = { val tparam = context.owner.newExistential(newTypeName("_"+tparams.size), context.tree.pos.focus) setInfo bounds - tparams += tparam + tparams ::= tparam tparam.tpe } val tp1 = tp map { - case WildcardType => - addTypeParam(TypeBounds.empty) - case BoundedWildcardType(bounds) => - addTypeParam(bounds) - case t => t + case WildcardType => addTypeParam(TypeBounds.empty) + case BoundedWildcardType(bounds) => addTypeParam(bounds) + case t => t } - existentialAbstraction(tparams.toList, tp1) + if (tp eq tp1) tp + else existentialAbstraction(tparams.reverse, tp1) } def ensureFullyDefined(tp: Type): Type = if (isFullyDefined(tp)) tp else makeFullyDefined(tp) |