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Fix parents of tuple classes #13659

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merged 3 commits into from Oct 6, 2021
Merged

Fix parents of tuple classes #13659

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c0db02c
Harden orDominator
odersky Oct 2, 2021
837afec
Better fix: Fix parents of tuple classes
odersky Oct 5, 2021
eb81076
Fix tuple erasure (2nd attempt)
odersky Oct 5, 2021
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11 changes: 6 additions & 5 deletions compiler/src/dotty/tools/dotc/core/Definitions.scala
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Expand Up @@ -1620,11 +1620,11 @@ class Definitions {

/** If `cls` is Tuple1..Tuple22, add the corresponding *: type as last parent to `parents` */
def adjustForTuple(cls: ClassSymbol, tparams: List[TypeSymbol], parents: List[Type]): List[Type] = {
def syntheticParent(tparams: List[TypeSymbol]): Type =
if (tparams.isEmpty) TupleTypeRef
else TypeOps.nestedPairs(tparams.map(_.typeRef))
if (isTupleClass(cls)) parents :+ syntheticParent(tparams)
else parents
if !isTupleClass(cls) then parents
else if tparams.isEmpty then parents :+ TupleTypeRef
else
assert(parents.head.typeSymbol == ObjectClass)
TypeOps.nestedPairs(tparams.map(_.typeRef)) :: parents.tail
}

/** If it is BoxedUnit, remove `java.io.Serializable` from `parents`. */
Expand Down Expand Up @@ -1777,6 +1777,7 @@ class Definitions {
.updated(SingletonClass, ObjectClass)
.updated(TupleClass, ProductClass)
.updated(NonEmptyTupleClass, ProductClass)
.updated(PairClass, ObjectClass)

// ----- Initialization ---------------------------------------------------

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12 changes: 12 additions & 0 deletions tests/neg/i13435.check
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@@ -0,0 +1,12 @@
-- [E029] Pattern Match Exhaustivity Warning: tests/neg/i13435.scala:7:2 -----------------------------------------------
7 | s match
| ^
| match may not be exhaustive.
|
| It would fail on pattern case: (_), ((_, _), (_, _))

longer explanation available when compiling with `-explain`
-- Error: tests/neg/i13435.scala:8:10 ----------------------------------------------------------------------------------
8 | case (dim: Axis, size: Int) => dim // error
| ^^^^^^^^^
| trait Singleton cannot be used in runtime type tests
8 changes: 8 additions & 0 deletions tests/neg/i13435.scala
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@@ -0,0 +1,8 @@
type Axis = String&Singleton
type ShapeTuple = Tuple1[(Axis, Int)]|Tuple2[(Axis, Int), (Axis, Int)]
type Shape = (Axis, Int) |ShapeTuple


def mkSchema(s: Shape) =
s match
case (dim: Axis, size: Int) => dim // error