diff options
| -rw-r--r-- | src/compiler/scala/tools/nsc/transform/patmat/MatchTranslation.scala | 18 | ||||
| -rw-r--r-- | test/files/run/t9567c.scala | 29 |
2 files changed, 44 insertions, 3 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/patmat/MatchTranslation.scala b/src/compiler/scala/tools/nsc/transform/patmat/MatchTranslation.scala index 451b72d498..a2afb76b0e 100644 --- a/src/compiler/scala/tools/nsc/transform/patmat/MatchTranslation.scala +++ b/src/compiler/scala/tools/nsc/transform/patmat/MatchTranslation.scala @@ -504,14 +504,26 @@ trait MatchTranslation { */ def treeMaker(binder: Symbol, binderKnownNonNull: Boolean, pos: Position): TreeMaker = { val paramAccessors = binder.constrParamAccessors + val numParams = paramAccessors.length + def paramAccessorAt(subPatIndex: Int) = paramAccessors(math.min(subPatIndex, numParams - 1)) // binders corresponding to mutable fields should be stored (SI-5158, SI-6070) // make an exception for classes under the scala package as they should be well-behaved, // to optimize matching on List + val hasRepeated = paramAccessors.lastOption match { + case Some(x) => definitions.isRepeated(x) + case _ => false + } val mutableBinders = ( if (!binder.info.typeSymbol.hasTransOwner(ScalaPackageClass) && - (paramAccessors exists (_.isMutable))) - subPatBinders.zipWithIndex.collect{ case (binder, idx) if paramAccessors(idx).isMutable => binder } - else Nil + (paramAccessors exists (x => x.isMutable || definitions.isRepeated(x)))) { + + subPatBinders.zipWithIndex.flatMap { + case (binder, idx) => + val param = paramAccessorAt(idx) + if (param.isMutable || (definitions.isRepeated(param) && !aligner.isStar)) binder :: Nil + else Nil + } + } else Nil ) // checks binder ne null before chaining to the next extractor diff --git a/test/files/run/t9567c.scala b/test/files/run/t9567c.scala new file mode 100644 index 0000000000..560bea8821 --- /dev/null +++ b/test/files/run/t9567c.scala @@ -0,0 +1,29 @@ +case class CaseSequenceTopLevel(as: Int*) + +object Test { + def main(args: Array[String]): Unit = { + + val buffer1 = collection.mutable.Buffer(0, 0) + CaseSequenceTopLevel(buffer1: _*) match { + case CaseSequenceTopLevel(_, i) => + buffer1(1) = 1 + assert(i == 0, i) // fails in 2.11.7 -optimize + } + + case class CaseSequence(as: Int*) + val buffer2 = collection.mutable.Buffer(0, 0) + CaseSequence(buffer2: _*) match { + case CaseSequence(_, i) => + buffer2(1) = 1 + assert(i == 0, i) + } + + case class CaseSequenceWithVar(var x: Any, as: Int*) + val buffer3 = collection.mutable.Buffer(0, 0) + CaseSequenceWithVar("", buffer3: _*) match { + case CaseSequenceWithVar(_, _, i) => // crashes in 2.11.7 + buffer2(1) = 1 + assert(i == 0, i) + } + } +} |