diff options
| -rw-r--r-- | src/compiler/scala/tools/nsc/transform/TailCalls.scala | 6 | ||||
| -rw-r--r-- | test/files/pos/t8893.scala | 129 |
2 files changed, 132 insertions, 3 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/TailCalls.scala b/src/compiler/scala/tools/nsc/transform/TailCalls.scala index 49bca5364c..16ea3ea90f 100644 --- a/src/compiler/scala/tools/nsc/transform/TailCalls.scala +++ b/src/compiler/scala/tools/nsc/transform/TailCalls.scala @@ -219,7 +219,7 @@ abstract class TailCalls extends Transform { override def transform(tree: Tree): Tree = { /* A possibly polymorphic apply to be considered for tail call transformation. */ - def rewriteApply(target: Tree, fun: Tree, targs: List[Tree], args: List[Tree]) = { + def rewriteApply(target: Tree, fun: Tree, targs: List[Tree], args: List[Tree], mustTransformArgs: Boolean = true) = { val receiver: Tree = fun match { case Select(qual, _) => qual case _ => EmptyTree @@ -227,7 +227,7 @@ abstract class TailCalls extends Transform { def receiverIsSame = ctx.enclosingType.widen =:= receiver.tpe.widen def receiverIsSuper = ctx.enclosingType.widen <:< receiver.tpe.widen def isRecursiveCall = (ctx.method eq fun.symbol) && ctx.tailPos - def transformArgs = noTailTransforms(args) + def transformArgs = if (mustTransformArgs) noTailTransforms(args) else args def matchesTypeArgs = ctx.tparams sameElements (targs map (_.tpe.typeSymbol)) /* Records failure reason in Context for reporting. @@ -393,7 +393,7 @@ abstract class TailCalls extends Transform { if (res ne arg) treeCopy.Apply(tree, fun, res :: Nil) else - rewriteApply(fun, fun, Nil, args) + rewriteApply(fun, fun, Nil, args, mustTransformArgs = false) case Apply(fun, args) => rewriteApply(fun, fun, Nil, args) diff --git a/test/files/pos/t8893.scala b/test/files/pos/t8893.scala new file mode 100644 index 0000000000..b87c8bdd3c --- /dev/null +++ b/test/files/pos/t8893.scala @@ -0,0 +1,129 @@ +// Took > 10 minutes to run the tail call phase. +object Test { + def a(): Option[String] = Some("a") + + def main(args: Array[String]) { + a() match { + case Some(b1) => + a() match { + case Some(b2) => + a() match { + case Some(b3) => + a() match { + case Some(b4) => + a() match { + case Some(b5) => + a() match { + case Some(b6) => + a() match { + case Some(b7) => + a() match { + case Some(b8) => + a() match { + case Some(b9) => + a() match { + case Some(b10) => + a() match { + case Some(b11) => + a() match { + case Some(b12) => + a() match { + case Some(b13) => + a() match { + case Some(b14) => + a() match { + case Some(b15) => + a() match { + case Some(b16) => + a() match { + case Some(b17) => + a() match { + case Some(b18) => + a() match { + case Some(b19) => + a() match { + case Some(b20) => + a() match { + case Some(b21) => + a() match { + case Some(b22) => + a() match { + case Some(b23) => + a() match { + case Some(b24) => + a() match { + case Some(b25) => + a() match { + case Some(b26) => + a() match { + case Some(b27) => + a() match { + case Some(b28) => + a() match { + case Some(b29) => + a() match { + case Some(b30) => + println("yay") + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + case None => None + } + } +} + |