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=== tests/cases/compiler/fatarrowfunctionsOptionalArgsErrors1.ts ===
(arg1?, arg2) => 101;
>(arg1?, arg2) => 101 : (arg1?: any, arg2: any) => number
>arg1 : any
>arg2 : any
>101 : 101
(...arg?) => 102;
>(...arg?) => 102 : (...arg?: any[]) => number
>arg : any[]
>102 : 102
(...arg) => 103;
>(...arg) => 103 : (...arg: any[]) => number
>arg : any[]
>103 : 103
(...arg:number [] = []) => 104;
>(...arg:number [] = []) => 104 : (...arg?: number[]) => number
>arg : number[]
>[] : undefined[]
>104 : 104
// Uninitialized parameter makes the initialized one required
(arg1 = 1, arg2) => 1;
>(arg1 = 1, arg2) => 1 : (arg1: number, arg2: any) => number
>arg1 : number
>1 : 1
>arg2 : any
>1 : 1
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