Empty paren in expression throws TypeError

[jfaissolle]

The following example crashes eslint (caused by the last line in the file):

var left, aSize, bSize;

aSize = {
  width: 800,
  height: 600
};

bSize = {
  width: 200,
  height: 100
};

left = (aSize.width/2) - ()

with error

eslint test.js

/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/lib/token-store.js:181
            starts[right.range[0]] + padding
                              ^
TypeError: Cannot read property '0' of undefined
    at EventEmitter.api.getTokensBetween (/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/lib/token-store.js:181:31)
    at RuleContext.(anonymous function) [as getTokensBetween] (/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/lib/rule-context.js:82:33)
    at isSpaced (/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/lib/rules/space-infix-ops.js:21:34)
    at EventEmitter.checkBinary (/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/lib/rules/space-infix-ops.js:40:14)
    at EventEmitter.emit (events.js:117:20)
    at Controller.controller.traverse.enter (/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/lib/eslint.js:673:25)
    at Controller.__execute (/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/node_modules/estraverse/estraverse.js:397:31)
    at Controller.traverse (/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/node_modules/estraverse/estraverse.js:495:28)
    at EventEmitter.module.exports.api.verify (/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/lib/eslint.js:666:24)
    at processFile (/home/julien/.nvm/v0.10.30/lib/node_modules/eslint/lib/cli-engine.js:172:27)

[nzakas]

Definitely a bug

[oaleynik]

@nzakas I've debugged it a bit and looks like parentheses in the end of the line left = (aSize.width / 2) - () treated as ArrowParameterPlaceHolder

https://www.dropbox.com/s/0oltkd0vbdo0iew/Screenshot%202015-02-10%2018.51.52.png?dl=0

[michaelficarra]

But not a bug in eslint. This is an espree bug.

[nzakas]

@michaelficarra is right, can you file a bug with Espree? https://github.com/eslint/espree/issues

[oaleynik]

@nzakas bug submitted to Espree

[nzakas]

Thanks!