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Merge pull request #12378 from 7mind/feature/kind-projector-underscores
Allow `_` as a type lambda placeholder in `-Ykind-projector:underscores` compatiblity mode
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| -- Error: tests/neg-custom-args/kind-projector-underscores.scala:7:23 -------------------------------------------------- | ||
| 7 |class Bar3 extends Foo[λ[List[x] => Int]] // error | ||
| | ^^^^^^^^^^^^^^^^^ | ||
| | λ requires a single argument of the form X => ... or (X, Y) => ... | ||
| -- [E095] Syntax Error: tests/neg-custom-args/kind-projector-underscores.scala:10:8 ------------------------------------ | ||
| 10 | type -_ = Int // error -_ not allowed as a type def name without backticks | ||
| | ^ | ||
| | =, >:, or <: expected, but '_' found | ||
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| longer explanation available when compiling with `-explain` | ||
| -- [E095] Syntax Error: tests/neg-custom-args/kind-projector-underscores.scala:11:8 ------------------------------------ | ||
| 11 | type +_ = Int // error +_ not allowed as a type def name without backticks | ||
| | ^ | ||
| | =, >:, or <: expected, but '_' found | ||
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| longer explanation available when compiling with `-explain` | ||
| -- Error: tests/neg-custom-args/kind-projector-underscores.scala:5:23 -------------------------------------------------- | ||
| 5 |class Bar1 extends Foo[Either[_, _]] // error | ||
| | ^^^^^^^^^^^^ | ||
| | Type argument Either does not have the same kind as its bound [_$1] | ||
| -- Error: tests/neg-custom-args/kind-projector-underscores.scala:6:22 -------------------------------------------------- | ||
| 6 |class Bar2 extends Foo[_] // error | ||
| | ^ | ||
| | Type argument _ does not have the same kind as its bound [_$1] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| package kind_projector_neg | ||
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| trait Foo[F[_]] | ||
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| class Bar1 extends Foo[Either[_, _]] // error | ||
| class Bar2 extends Foo[_] // error | ||
| class Bar3 extends Foo[λ[List[x] => Int]] // error | ||
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| object Test { | ||
| type -_ = Int // error -_ not allowed as a type def name without backticks | ||
| type +_ = Int // error +_ not allowed as a type def name without backticks | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| package kind_projector | ||
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| trait Foo[F[_]] | ||
| trait Qux[F[_, _]] | ||
| trait Baz[F[_], A, B] | ||
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| trait FooPlus[+F[+_]] | ||
| trait QuxPlus[+F[+_, +_]] | ||
| trait BazPlus[+F[+_], +A, +B] | ||
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| trait FooMinus[-F[-_]] | ||
| trait QuxMinus[-F[-_, -_]] | ||
| trait BazMinus[-F[-_], -A, -B] | ||
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| class Bar1 extends Foo[Either[Int, _]] | ||
| class Bar2 extends Foo[Either[_, Int]] | ||
| class Bar3 extends Foo[_ => Int] | ||
| class Bar4 extends Foo[Int => _] | ||
| class Bar5 extends Foo[(Int, _, Int)] | ||
| class Bar6 extends Foo[λ[x => Either[Int, x]]] | ||
| class Bar7 extends Qux[λ[(x, y) => Either[y, x]]] | ||
| class Bar8 extends Foo[Baz[Int => _, _, Int]] | ||
| class Bar9 extends Foo[λ[x => Baz[x => _, Int, x]]] | ||
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| class BarPlus1 extends FooPlus[Either[Int, +_]] | ||
| class BarPlus2 extends FooPlus[Either[+_, Int]] | ||
| class BarPlus3 extends FooPlus[Int => +_] | ||
| class BarPlus4 extends FooPlus[(Int, +_, Int)] | ||
| class BarPlus5 extends FooPlus[λ[`+x` => Either[Int, x]]] | ||
| class BarPlus6 extends QuxPlus[λ[(`+x`, `+y`) => Either[y, x]]] | ||
| class BarPlus7 extends FooPlus[BazPlus[Int => +_, +_, Int]] | ||
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| class BarMinus1 extends FooMinus[-_ => Int] | ||
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| class VarianceAnnotationIsActuallyIgnored1 extends FooPlus[Either[Int, -_]] | ||
| class VarianceAnnotationIsActuallyIgnored2 extends FooPlus[Either[-_, Int]] | ||
| class VarianceAnnotationIsActuallyIgnored3 extends FooMinus[+_ => Int] | ||
| class VarianceAnnotationIsActuallyIgnored4 extends FooPlus[Int => -_] | ||
| class VarianceAnnotationIsActuallyIgnored5 extends FooPlus[(Int, -_, Int)] | ||
| class VarianceAnnotationIsActuallyIgnored6 extends FooPlus[λ[`-x` => Either[Int, x]]] | ||
| class VarianceAnnotationIsActuallyIgnored7 extends QuxPlus[λ[(`-x`, `-y`) => Either[y, x]]] | ||
| class VarianceAnnotationIsActuallyIgnored8 extends FooPlus[BazPlus[Int => -_, -_, Int]] | ||
| class VarianceAnnotationIsActuallyIgnored9 extends Foo[λ[`-x` => BazPlus[x => -_, Int, x]]] | ||
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| class BackticksAreFine1 extends FooPlus[Either[Int, `-_`]] | ||
| class BackticksAreFine2 extends FooPlus[Either[`-_`, Int]] | ||
| class BackticksAreFine3 extends FooMinus[`+_` => Int] | ||
| class BackticksAreFine4 extends FooPlus[Int => `-_`] | ||
| class BackticksAreFine5 extends FooPlus[(Int, `-_`, Int)] | ||
| class BackticksAreFine6 extends FooPlus[BazPlus[Int => `-_`, `-_`, Int]] | ||
| class BackticksAreFine7 extends Foo[λ[`-x` => BazPlus[x => `-_`, Int, x]]] | ||
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| class SpacesAreFine1 extends FooPlus[Either[Int, - _ ]] | ||
| class SpacesAreFine2 extends FooPlus[Either[ - _ , Int]] | ||
| class SpacesAreFine3 extends FooMinus[ + _ => Int] | ||
| class SpacesAreFine4 extends FooPlus[Int => - _] | ||
| class SpacesAreFine5 extends FooPlus[(Int, - _, Int)] | ||
| class SpacesAreFine6 extends FooPlus[BazPlus[Int => - _ , - _, Int]] | ||
| class SpacesAreFine7 extends Foo[λ[`-x` => BazPlus[x => - _ , Int, x]]] |