See http://github.com/nex3/haml/issues/issue/152/ for inro.
Briefly, I have css-class prefixes (like namespaces) and wanna write
many rules in one namespace without multiply repeating, e.g. for
`.myns-elem1`, `.myns-elem2` it is very logical write:
.myns-
&elem1
...
&elem2
...
why `&` needs could get replaced with `*` or an element name? it's
possible throw error only when interpolation of `&` make incorrect
selectors (like `*smth`) and _warn_ when it make _possible_ wrong
selectors (like `divsmth`, _warn_ because it's possible correct
selector for custom dom-nodes).
Now, with variables interpolation possible make incorrect selector,
`#{$myvar}__subelem` produce result without any warns on any variable
content. I.e. shortest `&__elem` is deprecated way for broke
selectors, but longest `#{$myvar}__subelem` take possibility for same
errors.
Let's discuss about possible alternative syntax for short reference to
parent selector...
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