Issues with complicated if/then/else/content mixin

[evilgeniuscreative]

Got an error that Sass2Stylus couldn't process this SASS code:

@mixin break-at($name) {
@if map-has-key($breakpoints, $name) {
@media #{inspect(map-get($breakpoints, $name))} {
@content;
}
}
@else {
@warn "Unfortunately, no value could be retrieved from #{$breakpoints}. " + "Please make sure it is defined in $breakpoints map.";
}
}