Hello! The 0.9 release prompted me to poke at my nascent rust code. Very
impressed with the language and the progress since I last looked (0.4
maybe?).
Some questions that I wasn't able to find answers for:
* Is there any built-in way to iterate over all values of a C-like enum?
It's not hard to define an iterator method that implements this for any
given type, but it's tedious boilerplate that seems better left to the
compiler.
* Is it possible to express "if a type implements trait A, here is a
default implementation of trait B"? I tried the obvious way ("impl<T:
TraitA> TraitB for T"), but it looks like the rust compiler can't
disambiguate between that impl and type-specific impls.
Thanks!
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