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