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=== tests/cases/compiler/arrayConcat2.ts ===
var a: string[] = [];
>a : string[]
>[] : undefined[]
a.concat("hello", 'world');
>a.concat("hello", 'world') : string[]
>a.concat : { (...items: ConcatArray<string>[]): string[]; (...items: (string | ConcatArray<string>)[]): string[]; }
>a : string[]
>concat : { (...items: ConcatArray<string>[]): string[]; (...items: (string | ConcatArray<string>)[]): string[]; }
>"hello" : "hello"
>'world' : "world"
a.concat('Hello');
>a.concat('Hello') : string[]
>a.concat : { (...items: ConcatArray<string>[]): string[]; (...items: (string | ConcatArray<string>)[]): string[]; }
>a : string[]
>concat : { (...items: ConcatArray<string>[]): string[]; (...items: (string | ConcatArray<string>)[]): string[]; }
>'Hello' : "Hello"
var b = new Array<string>();
>b : string[]
>new Array<string>() : string[]
>Array : ArrayConstructor
b.concat('hello');
>b.concat('hello') : string[]
>b.concat : { (...items: ConcatArray<string>[]): string[]; (...items: (string | ConcatArray<string>)[]): string[]; }
>b : string[]
>concat : { (...items: ConcatArray<string>[]): string[]; (...items: (string | ConcatArray<string>)[]): string[]; }
>'hello' : "hello"
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