Error loading acorn

[ForbesLindesay]

The following code:

require('node-jsx').install();
var acorn = require('acorn');

Results in:

/Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:2981
  _classCallCheck(this, TokContext);
                        ^
ReferenceError: TokContext is not defined
    at new TokContext (/Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:2981:25)
    at Object.15../state (/Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:2990:11)
    at s (/Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:1:681)
    at /Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:1:732
    at Object.1../expression (/Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:78:21)
    at s (/Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:1:681)
    at e (/Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:1:852)
    at /Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:1:870
    at a (/Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:1:150)
    at Object.<anonymous> (/Users/forbeslindesay/Documents/GitHub/temp/node_modules/acorn/dist/acorn.js:1:383)

but

var acorn = require('acorn');

works fine.

See pugjs/pug#1925

[JMLX42]

+1 I have the same error.

vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:2275
  _classCallCheck(this, TokContext);
                        ^
ReferenceError: TokContext is not defined
    at new TokContext (/vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:2275:25)
    at Object../state (/vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:2285:11)
    at s (/vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:1:681)
    at /vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:1:732
    at Object../expression (/vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:907:21)
    at s (/vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:1:681)
    at e (/vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:1:852)
    at /vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:1:870
    at a (/vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:1:150)
    at Object.<anonymous> (/vagrant/www/node_modules/keystone/node_modules/jade/node_modules/constantinople/node_modules/acorn/dist/acorn.js:1:383)
    at Module._compile (module.js:460:26)
    at Object.require.extensions.(anonymous function) [as .js] (/vagrant/www/node_modules/node-jsx/index.js:29:12)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)