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Erased fields are not nullable #23311

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Erased fields are not nullable #23311

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/transform/CollectNullableFields.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,7 @@ class CollectNullableFields extends MiniPhase {
val sym = tree.symbol
val isNullablePrivateField =
sym.isField &&
!sym.is(Lazy) &&
!sym.isOneOf(Lazy | Erased) &&
!sym.owner.is(Trait) &&
sym.initial.isAllOf(PrivateLocal) &&
// We need `isNullableClassAfterErasure` and not `isNullable` because
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24 changes: 24 additions & 0 deletions tests/run/i23305.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,24 @@
//> using options -language:experimental.erasedDefinitions

erased trait DBMeta[A]

trait Table[A]

case class Saved[A]()
object Saved {
def table[A](using dbm: DBMeta[A]): Table[Saved[A]] = new Table[Saved[A]] {}
}

case class deleteBulk[A](as: List[Saved[A]])(using dbm: DBMeta[A], tbl: Table[A]) {
final given savedTable: Table[Saved[A]] = Saved.table[A]
}

case class Foo()
object Foo {
given dbMeta: DBMeta[Foo] = new DBMeta[Foo] {}
given table: Table[Foo] = new Table[Foo] {}
}

@main def Test =
val del = deleteBulk(List(Saved[Foo]()))
del.savedTable
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