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=== tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts ===
function f0(a, [a, [b]], {b}) { }
>f0 : (a: any, [a, [b]]: [any, [any]], { b }: { b: any; }) => void
>a : any
>a : any
>b : any
>b : any
function f1([a, a]) { }
>f1 : ([a, a]: [any, any]) => void
>a : any
>a : any
function f2({b}, {b}) { }
>f2 : ({ b }: { b: any; }, { b }: { b: any; }) => void
>b : any
>b : any
function f3([c,[c],[[c]]]) { }
>f3 : ([c, [c], [[c]]]: [any, [any], [[any]]]) => void
>c : any
>c : any
>c : any
function f4({d, d:{d}}) { }
>f4 : ({ d, d: { d } }: { d: { d: any; }; }) => void
>d : { d: any; }
>d : any
>d : any
function f5({e, e: {e}}, {e}, [d,e, [[e]]], ...e) { }
>f5 : ({ e, e: { e } }: { e: { e: any; }; }, { e }: { e: any; }, [d, e, [[e]]]: [any, any, [[any]]], ...e: any[]) => void
>e : { e: any; }
>e : any
>e : any
>e : any
>d : any
>e : any
>e : any
>e : any[]
function f6([f, ...f]) { }
>f6 : ([f, ...f]: [any, ...any[]]) => void
>f : any
>f : any[]
function f7(a, func = (a) => { return 1 }) { } // not error
>f7 : (a: any, func?: (a: any) => number) => void
>a : any
>func : (a: any) => number
>(a) => { return 1 } : (a: any) => number
>a : any
>1 : 1
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