New rule idea: Warn when a disable is unnecessary

[j-f1]

For example:

var x = 2;
/* eslint-disable no-undef */ // Error: `no-undef` rule is not triggered in this section.
x = 3
/* eslint-enable no-undef */

This verifies that you actually need all of your eslint-disable* comments.

[mysticatea]

Thank you for this issue.

However I'm confused. Is it different from no-unused-disable rule?

[j-f1]

No, that rule covers it. Thanks for pointing that out!