• Node Version: 10.2.1
• NPM Version: 6.1.0
• postcss-less Version: 2.0.0

If you have a large amount of code to share which demonstrates the problem you're experiencing, please provide a link to your
repository rather than pasting code. Otherwise, please paste relevant short snippets below.

LESS

@custom-selector :--camelCase .my-css-selector;

JavaScript

import postCssLess from 'postcss-less';
const less = `
@custom-selector :--camelCase .my-css-selector;
`;
const root = postCssLess.parse(less);

Expected Behavior

Should be resolved as at-rule.

Actual Behavior

Resolved as variable

How can we reproduce the behavior?

Example above.

Maybe we should adopt this https://github.com/less/less.js/blob/e3c13121dfdca48ba8fe26335cc12dd3f7948676/lib/less/parser/parser.js for better detecting.

/cc @e-cloud @davidyorr looks like regression