.sass parser fatal error on &.--

[rick-nu]

What version of Sass Lint are you using?

1.12.1

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

_alert.sass

.c-alert
    position: relative
    padding: 1rem
    background: $color-primary
    color: $color-primary-text
    border-radius: $border-radius-small
    display: block
    margin-bottom: 1rem

    &.--info
        background: $color-info
        color: $color-info-text

node_modules/.bin/sass-lint -q -v

front-end/shared/sass/6-components/_alert.sass
  10:1  error  Please check validity of the block starting from line #10  Fatal

What did you expect to happen?

I don't expect a fatal here. All the &.-- references I use in my project break the parser. It does work when I use &.-, & .--, but not &.--