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Normalise mirrorType for mirror Synthesis #19199

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merged 2 commits into from
Dec 12, 2023
Merged

Normalise mirrorType for mirror Synthesis #19199

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d3174a1
Normalize mirrorType before reducing to mirrorSource
EugeneFlesselle Dec 5, 2023
f7e2e7c
Normalize only when needed
EugeneFlesselle Dec 5, 2023
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1 change: 1 addition & 0 deletions compiler/src/dotty/tools/dotc/typer/Synthesizer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -379,6 +379,7 @@ class Synthesizer(typer: Typer)(using @constructorOnly c: Context):
// avoid type aliases for tuples
Right(MirrorSource.GenericTuple(types))
case _ => reduce(tp.underlying)
case tp: MatchType => reduce(tp.normalized)
case _ => reduce(tp.superType)
case tp @ AndType(l, r) =>
for
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13 changes: 13 additions & 0 deletions tests/pos/i19198.scala
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@@ -0,0 +1,13 @@
import deriving.Mirror
import compiletime.summonInline

inline def check1[Tps <: NonEmptyTuple]: Unit =
summonInline[Mirror.Of[Tuple.Head[Tps]]]

inline def check2[Tps <: NonEmptyTuple]: Unit =
type FromType = Tuple.Head[Tps]
summonInline[Mirror.Of[FromType]]

@main def Test: Unit =
check1[Option[Int] *: EmptyTuple] // Ok
check2[Option[Int] *: EmptyTuple] // Error: FromType is widened to Any in Syntheziser
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