LearnBoost/stylus — Issue #551: Fix mixin introspection
Author: visionmedia
Created: 2012-02-02 19:08:40+00:00
State: open
Labels: Bug, Priority - high

ex:
```
for name in sprites
a#{name}
display: block
margin: 5px
sprite: name
&:hover
sprite: {name}-blue
```

the &:hover seems to not give you `mixin == 'block'` as it should