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Add IO test #12859

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Merged
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Jun 18, 2021
Merged

Add IO test #12859

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21 changes: 21 additions & 0 deletions tests/neg-custom-args/captures/io.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
sealed trait IO:
def puts(msg: Any): Unit = println(msg)

def test1 =
val IO : IO retains * = new IO {}
def foo = IO.puts("hello")
val x : () => Unit = () => foo // error: Found: (() => Unit) retains IO; Required: () => Unit

def test2 =
val IO : IO retains * = new IO {}
def puts(msg: Any, io: IO retains *) = println(msg)
def foo() = puts("hello", IO)
val x : () => Unit = () => foo() // error: Found: (() => Unit) retains IO; Required: () => Unit

type Capability[T] = T retains *

def test3 =
val IO : Capability[IO] = new IO {}
def puts(msg: Any, io: Capability[IO]) = println(msg)
def foo() = puts("hello", IO)
val x : () => Unit = () => foo() // error: Found: (() => Unit) retains IO; Required: () => Unit