JsModule {
    bom_token: missing (optional),
    interpreter_token: missing (optional),
    directives: JsDirectiveList [],
    items: JsModuleItemList [
        JsFunctionDeclaration {
            async_token: missing (optional),
            function_token: FUNCTION_KW@0..9 "function" [] [Whitespace(" ")],
            star_token: missing (optional),
            id: JsIdentifierBinding {
                name_token: IDENT@9..12 "foo" [] [],
            },
            type_parameters: missing (optional),
            parameters: JsParameters {
                l_paren_token: L_PAREN@12..13 "(" [] [],
                items: JsParameterList [
                    JsBogusParameter {
                        items: [
                            TRUE_KW@13..17 "true" [] [],
                        ],
                    },
                ],
                r_paren_token: R_PAREN@17..19 ")" [] [Whitespace(" ")],
            },
            return_type_annotation: missing (optional),
            body: JsFunctionBody {
                l_curly_token: L_CURLY@19..20 "{" [] [],
                directives: JsDirectiveList [],
                statements: JsStatementList [],
                r_curly_token: R_CURLY@20..21 "}" [] [],
            },
        },
    ],
    eof_token: EOF@21..22 "" [Newline("\n")] [],
}

0: JS_MODULE@0..22
  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..21
    0: JS_FUNCTION_DECLARATION@0..21
      0: (empty)
      1: FUNCTION_KW@0..9 "function" [] [Whitespace(" ")]
      2: (empty)
      3: JS_IDENTIFIER_BINDING@9..12
        0: IDENT@9..12 "foo" [] []
      4: (empty)
      5: JS_PARAMETERS@12..19
        0: L_PAREN@12..13 "(" [] []
        1: JS_PARAMETER_LIST@13..17
          0: JS_BOGUS_PARAMETER@13..17
            0: TRUE_KW@13..17 "true" [] []
        2: R_PAREN@17..19 ")" [] [Whitespace(" ")]
      6: (empty)
      7: JS_FUNCTION_BODY@19..21
        0: L_CURLY@19..20 "{" [] []
        1: JS_DIRECTIVE_LIST@20..20
        2: JS_STATEMENT_LIST@20..20
        3: R_CURLY@20..21 "}" [] []
  4: EOF@21..22 "" [Newline("\n")] []
--
formal_params_no_binding_element.js:1:14 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected a parameter but instead found 'true'.
  
  > 1 │ function foo(true) {}
      │              ^^^^
    2 │ 
  
  i Expected a parameter here.
  
  > 1 │ function foo(true) {}
      │              ^^^^
    2 │ 
  
--
function foo(true) {}