JsModule {
    bom_token: missing (optional),
    interpreter_token: missing (optional),
    directives: JsDirectiveList [],
    items: JsModuleItemList [
        JsExpressionStatement {
            expression: JsUnaryExpression {
                operator_token: VOID_KW@0..5 "void" [] [Whitespace(" ")],
                argument: JsBogusExpression {
                    items: [
                        ERROR_TOKEN@5..16 "\\u0061sync" [] [Whitespace(" ")],
                        FUNCTION_KW@16..25 "function" [] [Whitespace(" ")],
                        JsIdentifierBinding {
                            name_token: IDENT@25..26 "f" [] [],
                        },
                        JsParameters {
                            l_paren_token: L_PAREN@26..27 "(" [] [],
                            items: JsParameterList [],
                            r_paren_token: R_PAREN@27..28 ")" [] [],
                        },
                        JsFunctionBody {
                            l_curly_token: L_CURLY@28..29 "{" [] [],
                            directives: JsDirectiveList [],
                            statements: JsStatementList [],
                            r_curly_token: R_CURLY@29..30 "}" [] [],
                        },
                    ],
                },
            },
            semicolon_token: missing (optional),
        },
    ],
    eof_token: EOF@30..31 "" [Newline("\n")] [],
}

0: JS_MODULE@0..31
  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..30
    0: JS_EXPRESSION_STATEMENT@0..30
      0: JS_UNARY_EXPRESSION@0..30
        0: VOID_KW@0..5 "void" [] [Whitespace(" ")]
        1: JS_BOGUS_EXPRESSION@5..30
          0: ERROR_TOKEN@5..16 "\\u0061sync" [] [Whitespace(" ")]
          1: FUNCTION_KW@16..25 "function" [] [Whitespace(" ")]
          2: JS_IDENTIFIER_BINDING@25..26
            0: IDENT@25..26 "f" [] []
          3: JS_PARAMETERS@26..28
            0: L_PAREN@26..27 "(" [] []
            1: JS_PARAMETER_LIST@27..27
            2: R_PAREN@27..28 ")" [] []
          4: JS_FUNCTION_BODY@28..30
            0: L_CURLY@28..29 "{" [] []
            1: JS_DIRECTIVE_LIST@29..29
            2: JS_STATEMENT_LIST@29..29
            3: R_CURLY@29..30 "}" [] []
      1: (empty)
  4: EOF@30..31 "" [Newline("\n")] []
--
function_escaped_async.js:1:6 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × 'async' keyword cannot contain escape character.
  
  > 1 │ void \u0061sync function f(){}
      │      ^^^^^^^^^^
    2 │ 
  
--
void \u0061sync function f(){}