throw keyword static field name

[LongTengDao]

require('acorn').Parser().extend(
    require('acorn-class-fields'),
    require('acorn-static-class-features'),
).parse('class X{static delete}');

SyntaxError: Unexpected token (1:21)
    at Object.pp$4.raise (/node_modules/acorn/dist/acorn.js:2893:15)
    at Object.pp.unexpected (/node_modules/acorn/dist/acorn.js:697:10)
    at Object.pp.expect (/node_modules/acorn/dist/acorn.js:691:28)
    at Object.pp$3.parseMethod (/node_modules/acorn/dist/acorn.js:2679:10)
    at Object.pp$1.parseClassMethod (/node_modules/acorn/dist/acorn.js:1398:25)
    at Object.pp$1.parseClassElement (/node_modules/acorn/dist/acorn.js:1387:10)
    at Object.parseClassElement (/node_modules/acorn-class-fields/index.js:52:38)
    at Object.parseClassElement (/node_modules/acorn-static-class-features/index.js:30:40)
    at Object.pp$1.parseClass (/node_modules/acorn/dist/acorn.js:1325:26)
    at Object.parseClass (/node_modules/acorn-private-class-elements/index.js:85:29)
    at Object.pp$1.parseStatement (/node_modules/acorn/dist/acorn.js:841:19)
    at Object.pp$1.parseTopLevel (/node_modules/acorn/dist/acorn.js:754:23)
    at Object.parse (/node_modules/acorn/dist/acorn.js:554:17)
    at Function.parse (/node_modules/acorn/dist/acorn.js:577:37)