=== tests/cases/compiler/arrayAugment.ts ===
interface Array<T> {
>Array : T[], Symbol(Array, Decl(lib.d.ts, 1000, 23), Decl(lib.d.ts, 1171, 11), Decl(arrayAugment.ts, 0, 0))
>T : T, Symbol(T, Decl(lib.d.ts, 1007, 16), Decl(arrayAugment.ts, 0, 16))

    split: (parts: number) => T[][];
>split : (parts: number) => T[][], Symbol(split, Decl(arrayAugment.ts, 0, 20))
>parts : number, Symbol(parts, Decl(arrayAugment.ts, 1, 12))
>T : T, Symbol(T, Decl(lib.d.ts, 1007, 16), Decl(arrayAugment.ts, 0, 16))
}

var x = [''];
>x : string[], Symbol(x, Decl(arrayAugment.ts, 4, 3))
>[''] : string[]
>'' : string

var y = x.split(4);
>y : string[][], Symbol(y, Decl(arrayAugment.ts, 5, 3), Decl(arrayAugment.ts, 6, 3))
>x.split(4) : string[][]
>x.split : (parts: number) => string[][], Symbol(Array.split, Decl(arrayAugment.ts, 0, 20))
>x : string[], Symbol(x, Decl(arrayAugment.ts, 4, 3))
>split : (parts: number) => string[][], Symbol(Array.split, Decl(arrayAugment.ts, 0, 20))
>4 : number

var y: string[][]; // Expect no error here
>y : string[][], Symbol(y, Decl(arrayAugment.ts, 5, 3), Decl(arrayAugment.ts, 6, 3))