Incorrect syntax highlighting with selector interpolation and underscores

[aar0nr]

Description

Expected behavior: I expect the __foo portion of the selector to be the same color as other selectors.

Actual behavior: The selector is colored incorrectly.

Versions

Atom

Atom: 1.16.0
Electron: 1.3.13
Chrome: 52.0.2743.82
Node: 6.5.0

APM

apm: 1.16.1
npm: 3.10.5
node: 6.9.5 x64
python: 2.7.13
git: 2.12.2

Package

language-sass: 0.58.0

[winstliu]

.test {
  #{&}__foo {
    padding: 10px;
  }

  #{&}--foo {
    padding: 10px;
  }
}