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Fix #9239: Add regression test #11239

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Merged
merged 1 commit into from
Jan 29, 2021
Merged

Fix #9239: Add regression test #11239

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28 changes: 28 additions & 0 deletions tests/pos/9239.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,28 @@
object ABug:
sealed trait Bit
sealed trait B0 extends Bit
sealed trait B1 extends Bit

sealed trait Bin
sealed trait Nil extends Bin
sealed trait ::[U <: Bit, D <: Bin] extends Bin

type Zero = B0 :: Nil
type One = B1 :: Nil

type --[B <: Bin] =
B match
case B1 :: d => B0 :: d
case B0 :: B1 :: Nil => B1 :: Nil
case B0 :: d => B1 :: --[d]

type ×[N <: Bin, M <: Bin] =
(N, M) match
case (Zero, ?) => Zero

type ![N <: Bin] =
N match
case Zero => One
case One => One
case ? => ![--[N]] × (N)
case ? :: ? => ![--[N]] × (N)