=== tests/cases/compiler/duplicateOverloadInTypeAugmentation1.ts ===
interface Array<T> {
>Array : T[]
>T : T

    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T,
>reduce : { (callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue?: T): T; <U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U; (callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue?: T): T; <U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U; }
>callbackfn : (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T
>previousValue : T
>T : T
>currentValue : T
>T : T
>currentIndex : number
>array : T[]
>T : T
>T : T

        initialValue?: T): T;
>initialValue : T
>T : T
>T : T

    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U,
>reduce : { (callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue?: T): T; <U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U; (callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue?: T): T; <U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U; }
>U : U
>callbackfn : (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U
>previousValue : U
>U : U
>currentValue : T
>T : T
>currentIndex : number
>array : T[]
>T : T
>U : U

        initialValue: U): U;
>initialValue : U
>U : U
>U : U
}
var a: Array<string>;
>a : string[]
>Array : T[]

var r5 = a.reduce((x, y) => x + y);
>r5 : string
>a.reduce((x, y) => x + y) : string
>a.reduce : { (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: string[]) => string, initialValue?: string): string; <U>(callbackfn: (previousValue: U, currentValue: string, currentIndex: number, array: string[]) => U, initialValue: U): U; (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: string[]) => string, initialValue?: string): string; <U>(callbackfn: (previousValue: U, currentValue: string, currentIndex: number, array: string[]) => U, initialValue: U): U; }
>a : string[]
>reduce : { (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: string[]) => string, initialValue?: string): string; <U>(callbackfn: (previousValue: U, currentValue: string, currentIndex: number, array: string[]) => U, initialValue: U): U; (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: string[]) => string, initialValue?: string): string; <U>(callbackfn: (previousValue: U, currentValue: string, currentIndex: number, array: string[]) => U, initialValue: U): U; }
>(x, y) => x + y : (x: string, y: string) => string
>x : string
>y : string
>x + y : string
>x : string
>y : string