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Test case for issue 16311 #16317

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Merged
odersky merged 2 commits into from
Nov 11, 2022
Merged

Test case for issue 16311 #16317

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b82e1c2
Test case
odersky Nov 10, 2022
3c88376
Move test to proper place
odersky Nov 10, 2022
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17 changes: 17 additions & 0 deletions tests/pos-deep-subtype/i16311.scala
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Original file line number Diff line number Diff line change
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trait Tagged[U]
type WithTag[+T, U] = T & Tagged[U]

trait FromInput[Val]
implicit def coercedScalaInput[T]: FromInput[WithTag[T, Int]] = ???
implicit def optionInput[T](implicit ev: FromInput[T]): FromInput[Option[T]] = ???

trait WithoutInputTypeTags[T]
implicit def coercedOptArgTpe[T]: WithoutInputTypeTags[Option[WithTag[T, Int]]] = ???

trait InputType[+T]
class OptionInputType[T](ofType: InputType[T]) extends InputType[Option[T]]

type Argument[T]
def argument[T](argumentType: InputType[T])(implicit fromInput: FromInput[T], res: WithoutInputTypeTags[T]): Argument[Option[T]] = ???

def test = argument(OptionInputType(??? : InputType[WithTag[Boolean, Int]]))