`//eslint-disable-line`'s behavior is changed in 4.7.0

Tell us about your environment

• ESLint Version: 4.7.0
• Node Version: 8.4.0
• npm Version: 5.4.2

What parser (default, Babel-ESLint, etc.) are you using?

• default

Please show your full configuration:

• nothing

What did you do? Please include the actual source code causing the issue.

/* eslint-disable no-unused-vars */

var foo; // eslint-disable-line no-unused-vars
var bar;

/* eslint-enable no-unused-vars */

$ eslint test.js --rule no-unused-vars:error

What did you expect to happen?

No errors as same as 4.6.0.

What actually happened? Please include the actual, raw output from ESLint.

~\dev\sandbox> eslint test.js --rule no-unused-vars:error

C:\Users\t-nagashima.MSS\dev\sandbox\test.js
  6:5  error  'bar' is defined but never used  no-unused-vars

✖ 1 problem (1 error, 0 warnings)

[not-an-aardvark]

I think it makes the most sense for nesting to not be supported, and for eslint-disable and eslint-disable-line comments to be considered separately without relying on nesting. That way, the examples in https://github.com/eslint/eslint/issues/9318#issue-258221265 and https://github.com/eslint/eslint/issues/9318#issuecomment-329979578 will be considered correct), and the examples in https://github.com/eslint/eslint/pull/9216#discussion_r136707906 and https://github.com/eslint/eslint/issues/9215 will be considered incorrect.

Alternatively, we could update the implementation to support nesting again. (I don’t think reverting would work well since we’ve made some additional changes to the code since the original refactor landed). However, this could end up being confusing, because the behavior in https://github.com/eslint/eslint/issues/9215 definitely seems incorrect to me.

[shellscape]

As @mysticatea commented, our block-disabling comments stopped working in 4.7.0 as well.

/* eslint-disable quotes */
console.log("foo");
/* eslint-enable quotes */

That now throws an error on console.log as it violates the config quotes rule, even though it’s disabled for that block.