=== tests/cases/compiler/strictMode5.ts ===
function foo(...args) {
>foo : (...args: any[]) => void
>args : any[]

    "use strict"
}

class A {
>A : A

    m() {
>m : () => void

        "use strict"

        var v = () => {
>v : () => void
>() => {            return this.n();        } : () => void

            return this.n();
>this.n() : void
>this.n : () => void
>this : A
>n : () => void

        };
    }
    n() {}
>n : () => void
}

function bar(x: number = 10) {
>bar : (x?: number) => void
>x : number

    "use strict"
}