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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| //> using options -Xfatal-warnings | ||
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| import scala.reflect.TypeTest | ||
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| trait M: | ||
| type Tree <: AnyRef | ||
| type Apply <: Tree | ||
| given TypeTest[Tree, Apply] = ??? | ||
| val Apply: ApplyModule | ||
| trait ApplyModule: | ||
| this: Apply.type => | ||
| def unapply(x: Apply): (Tree, Tree) = ??? | ||
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| def quote(x: Tree) = x match | ||
| case Apply(f, args) => | ||
| println(args) | ||
| case _ => |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| trait A: | ||
| val x: Int | ||
| type T | ||
| case class B(x: Int, y: Int) extends A: | ||
| type T = String | ||
| val z: T = "B" | ||
| case class C(x: Int) extends A: | ||
| type T = Int | ||
| val z: T = 1 | ||
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| object BParts: | ||
| def unapply(b: B): Option[(b.x.type, b.y.type)] = Some((b.x, b.y)) | ||
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| def test1(a: A) = a match | ||
| case b @ B(x, y) => | ||
| // b: a.type & B | ||
| // x: (a.type & B).x.type | ||
| // y: (a.type & B).y.type | ||
| val e1: a.type = b | ||
| val e2: a.x.type = b.x | ||
| val e3: a.x.type = x | ||
| val e4: b.x.type = x | ||
| x + y | ||
| case C(x) => | ||
| val e1: a.x.type = x | ||
| x | ||
| case BParts(x, y) => | ||
| val e1: a.x.type = x | ||
| x + y | ||
| case _ => 0 | ||
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| def test2(a: A): a.T = | ||
| a match | ||
| case b: B => | ||
| // b: a.type & B | ||
| // b.z: b.T = (a & B)#T = a.T & String | ||
| b.z | ||
| case c: C => c.z | ||
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| def test3(a: A): a.T = | ||
| a match | ||
| case b: B => | ||
| // b: a.type & B; hence b.T <:< a.T & String | ||
| // We don't have a: b.type in the body, | ||
| // so we can't prove String <:< a.T | ||
| val x: b.T = b.z + "" | ||
| x | ||
| case c: C => | ||
| val x: c.T = c.z + 0 | ||
| x | ||
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| def test4(x: A, y: A) = | ||
| x match | ||
| case z: y.type => | ||
| // if x.eq(y) then z = x = y, | ||
| // z: x.type & y.type | ||
| val a: x.type = z | ||
| val b: y.type = z | ||
| case _ => |