Parser error in vendor/bootstrap/mixins.less #150
Description
I'm following the readme to set up the project, but I'm getting
Running "recess:build" (recess) task
>> Parser error in vendor/bootstrap/mixins.less
>> 561. .spanX (@index) when (@index > 0) {
>> 562. (~".span@{index}") { .span(@index); }
>> 563. .spanX(@index - 1);