tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(2,13): error TS2300: Duplicate identifier 'a'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(2,17): error TS2300: Duplicate identifier 'a'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(2,21): error TS2300: Duplicate identifier 'b'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(2,27): error TS2300: Duplicate identifier 'b'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(3,14): error TS2300: Duplicate identifier 'a'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(3,17): error TS2300: Duplicate identifier 'a'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(4,14): error TS2300: Duplicate identifier 'b'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(4,19): error TS2300: Duplicate identifier 'b'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(5,14): error TS2300: Duplicate identifier 'c'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(5,17): error TS2300: Duplicate identifier 'c'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(5,22): error TS2300: Duplicate identifier 'c'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(6,14): error TS2300: Duplicate identifier 'd'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(6,20): error TS2300: Duplicate identifier 'd'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(7,14): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(7,21): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(7,27): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(7,34): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(7,39): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(7,48): error TS2300: Duplicate identifier 'e'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(8,14): error TS2300: Duplicate identifier 'f'.
tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts(8,20): error TS2300: Duplicate identifier 'f'.


==== tests/cases/compiler/duplicateIdentifierBindingElementInParameterDeclaration1.ts (21 errors) ====
    
    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