File: extendGenericArray.types

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=== tests/cases/compiler/extendGenericArray.ts ===
interface Array<T> {
    foo(): T;
>foo : () => T
}

var arr: string[] = [];
>arr : string[]
>[] : undefined[]

var x: number = arr.foo();
>x : number
>arr.foo() : string
>arr.foo : () => string
>arr : string[]
>foo : () => string