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Fix i18518 #18520

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Merged
merged 2 commits into from
Oct 1, 2023
Merged

Fix i18518 #18520

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08376a5
Reject capturing function type in polymorphic functions
Linyxus Sep 6, 2023
bb1f028
Document the special case in `getFunction`
Linyxus Sep 6, 2023
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5 changes: 5 additions & 0 deletions compiler/src/dotty/tools/dotc/parsing/Parsers.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1419,6 +1419,11 @@ object Parsers {
private def getFunction(tree: Tree): Option[Function] = tree match {
case Parens(tree1) => getFunction(tree1)
case Block(Nil, tree1) => getFunction(tree1)
case Function(_, _: CapturesAndResult) =>
// A function tree like this will be desugared
// into a capturing type in the typer,
// so None is returned.
None
case t: Function => Some(t)
case _ => None
}
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5 changes: 5 additions & 0 deletions tests/neg-custom-args/captures/i18518.scala
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@@ -0,0 +1,5 @@
import language.experimental.captureChecking
type Foo1 = [R] -> (x: Unit) ->{} Unit // error
type Foo2 = [R] -> (x: Unit) ->{cap} Unit // error
type Foo3 = (c: Int^) -> [R] -> (x: Unit) ->{c} Unit // error
type Foo4 = (c: Int^) -> [R] -> (x0: Unit) -> (x: Unit) ->{c} Unit