swift - cannot create variadic tuple -

i have following functions

func func1(str1: (string...),str: string){ //wrong 1 error "cannot create variadic tuple"      }    func func1((str1:string...),str: string){ //wrong 1 error "cannot create variadic tuple"      } 

it shows error "cannot create variadic tuple" when try write above code..but works when try change parameter place below

func func1(str: string,str1: (string...)){ //right 1      }  func func1(str: string,str1: string...){  //right 1      } 

i changed parameter place , can me understand doing wrong ?

variadic paramter must last parameter of function. swift documentation:

a function may have @ 1 variadic parameter, , must appear last in parameter list, avoid ambiguity when calling function multiple parameters.