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Allow return in tailrec position #14067

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merged 2 commits into from Jan 20, 2022
Merged

Allow return in tailrec position #14067

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a349775
Allow return in tailrec position
mbovel Dec 23, 2021
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mbovel Dec 29, 2021
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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/transform/TailRec.scala
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Expand Up @@ -444,7 +444,7 @@ class TailRec extends MiniPhase {

case Return(expr, from) =>
val fromSym = from.symbol
val inTailPosition = fromSym.is(Label) && tailPositionLabeledSyms.contains(fromSym)
val inTailPosition = !fromSym.is(Label) || tailPositionLabeledSyms.contains(fromSym)
cpy.Return(tree)(transform(expr, inTailPosition), from)

case _ =>
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2 changes: 2 additions & 0 deletions tests/run/tailrec-return.check
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@@ -0,0 +1,2 @@
6
false
16 changes: 16 additions & 0 deletions tests/run/tailrec-return.scala
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@@ -0,0 +1,16 @@
object Test:

@annotation.tailrec
def sum(n: Int, acc: Int = 0): Int =
if n != 0 then return sum(n - 1, acc + n)
acc

@annotation.tailrec
def isEven(n: Int): Boolean =
if n != 0 && n != 1 then return isEven(n - 2)
if n == 1 then return false
true

def main(args: Array[String]): Unit =
println(sum(3))
println(isEven(5))