49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
=== tests/cases/compiler/contextualSignatureInstatiationContravariance.ts ===
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interface Animal { x }
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>Animal : Animal
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>x : any
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interface Giraffe extends Animal { y }
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>Giraffe : Giraffe
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>Animal : Animal
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>y : any
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interface Elephant extends Animal { y2 }
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>Elephant : Elephant
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>Animal : Animal
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>y2 : any
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var f2: <T extends Animal>(x: T, y: T) => void;
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>f2 : <T extends Animal>(x: T, y: T) => void
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>T : T
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>Animal : Animal
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>x : T
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>T : T
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>y : T
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>T : T
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var g2: (g: Giraffe, e: Elephant) => void;
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>g2 : (g: Giraffe, e: Elephant) => void
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>g : Giraffe
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>Giraffe : Giraffe
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>e : Elephant
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>Elephant : Elephant
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g2 = f2; // valid because both Giraffe and Elephant satisfy the constraint. T is Animal
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>g2 = f2 : <T extends Animal>(x: T, y: T) => void
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>g2 : (g: Giraffe, e: Elephant) => void
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>f2 : <T extends Animal>(x: T, y: T) => void
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var h2: (g1: Giraffe, g2: Giraffe) => void;
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>h2 : (g1: Giraffe, g2: Giraffe) => void
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>g1 : Giraffe
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>Giraffe : Giraffe
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>g2 : Giraffe
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>Giraffe : Giraffe
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h2 = f2; // valid because Giraffe satisfies the constraint. It is safe in the traditional contravariant fashion.
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>h2 = f2 : <T extends Animal>(x: T, y: T) => void
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>h2 : (g1: Giraffe, g2: Giraffe) => void
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>f2 : <T extends Animal>(x: T, y: T) => void
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