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Simplify body after redux #17244

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Simplify body after redux #17244

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0b86c4f
Update TypeComparer.scala
Decel Apr 13, 2023
87c1df6
Add regression test
Decel Apr 13, 2023
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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/core/TypeComparer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3151,7 +3151,7 @@ class TrackingTypeComparer(initctx: Context) extends TypeComparer(initctx) {
case redux =>
MatchResult.Reduced(redux.simplified)
case _ =>
MatchResult.Reduced(body)
MatchResult.Reduced(body.simplified)

if caseLambda.exists && matches(canWidenAbstract = false) then
redux(canApprox = true)
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7 changes: 7 additions & 0 deletions tests/pos/i16596.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
import scala.compiletime.ops.int

type Count[N,T] <: Tuple = (N,T) match
case (0,T) => EmptyTuple
case (N,T) => T *: Count[int.-[N, 1], T]

val a: Count[3, Int] = (1, 2, 3)