tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(3,13): error TS2300: Duplicate identifier 'a'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(3,17): error TS2300: Duplicate identifier 'a'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(3,21): error TS2300: Duplicate identifier 'b'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(3,27): error TS2300: Duplicate identifier 'b'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(4,14): error TS2300: Duplicate identifier 'a'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(4,17): error TS2300: Duplicate identifier 'a'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(5,14): error TS2300: Duplicate identifier 'b'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(5,19): error TS2300: Duplicate identifier 'b'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(6,14): error TS2300: Duplicate identifier 'c'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(6,18): error TS2300: Duplicate identifier 'c'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(6,24): error TS2300: Duplicate identifier 'c'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(7,14): error TS2300: Duplicate identifier 'd'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(7,21): error TS2300: Duplicate identifier 'd'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(8,14): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(8,21): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(8,27): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(8,35): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(8,40): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(8,49): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(9,14): error TS2300: Duplicate identifier 'f'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts(9,20): error TS2300: Duplicate identifier 'f'.


==== tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration2.ts (21 errors) ====
    
    "use strict"
    function f0(a, [a, [b]], {b}) { }
                ~
!!! error TS2300: Duplicate identifier 'a'.
                    ~
!!! error TS2300: Duplicate identifier 'a'.
                        ~
!!! error TS2300: Duplicate identifier 'b'.
                              ~
!!! error TS2300: Duplicate identifier 'b'.
    function f1([a, a]) { }
                 ~
!!! error TS2300: Duplicate identifier 'a'.
                    ~
!!! error TS2300: Duplicate identifier 'a'.
    function f2({b}, {b}) { }
                 ~
!!! error TS2300: Duplicate identifier 'b'.
                      ~
!!! error TS2300: Duplicate identifier 'b'.
    function f3([c, [c], [[c]]]) { }
                 ~
!!! error TS2300: Duplicate identifier 'c'.
                     ~
!!! error TS2300: Duplicate identifier 'c'.
                           ~
!!! error TS2300: Duplicate identifier 'c'.
    function f4({d, d: {d}}) { }
                 ~
!!! error TS2300: Duplicate identifier 'd'.
                        ~
!!! error TS2300: Duplicate identifier 'd'.
    function f5({e, e: {e}}, {e}, [d, e, [[e]]], ...e) { }
                 ~
!!! error TS2300: Duplicate identifier 'e'.
                        ~
!!! error TS2300: Duplicate identifier 'e'.
                              ~
!!! error TS2300: Duplicate identifier 'e'.
                                      ~
!!! error TS2300: Duplicate identifier 'e'.
                                           ~
!!! error TS2300: Duplicate identifier 'e'.
                                                    ~
!!! error TS2300: Duplicate identifier 'e'.
    function f6([f, ...f]) { }
                 ~
!!! error TS2300: Duplicate identifier 'f'.
                       ~
!!! error TS2300: Duplicate identifier 'f'.
    function f7(a, func = (a) => { return 1 }){ }  // not error