tests/cases/conformance/es6/destructuring/optionalBindingParameters1.ts(2,14): error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
tests/cases/conformance/es6/destructuring/optionalBindingParameters1.ts(8,5): error TS2345: Argument of type '[boolean, number, ""]' is not assignable to parameter of type '[string, number, boolean]'.
  Type 'boolean' is not assignable to type 'string'.


==== tests/cases/conformance/es6/destructuring/optionalBindingParameters1.ts (2 errors) ====
    
    function foo([x,y,z]?: [string, number, boolean]) {
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
    
    }
    
    foo(["", 0, false]);
    
    foo([false, 0, ""]);
        ~~~~~~~~~~~~~~
!!! error TS2345: Argument of type '[boolean, number, ""]' is not assignable to parameter of type '[string, number, boolean]'.
!!! error TS2345:   Type 'boolean' is not assignable to type 'string'.