| 'use strict'; |
| require('../common'); |
| const assert = require('assert'); |
| const v8 = require('v8'); |
| const vm = require('vm'); |
| |
| // Note: changing V8 flags after an isolate started is not guaranteed to work. |
| // Specifically here, V8 may cache compiled scripts between the flip of the |
| // flag. We use a different script each time to work around this problem. |
| v8.setFlagsFromString('--allow_natives_syntax'); |
| assert(eval('%IsSmi(42)')); |
| assert(vm.runInThisContext('%IsSmi(43)')); |
| |
| v8.setFlagsFromString('--noallow_natives_syntax'); |
| assert.throws(function() { eval('%IsSmi(44)'); }, |
| /^SyntaxError: Unexpected token '%'$/); |
| assert.throws(function() { vm.runInThisContext('%IsSmi(45)'); }, |
| /^SyntaxError: Unexpected token '%'$/); |
