These changes make const translation use adjustments (autodereference, autoreference, bare-fn-to-closure), like normal code does, replacing some ad-hoc logic that wasn't always right.
As a convenient side-effect, explicit dereference (both of pointers and of newtypes) is also supported in const expressions.
There is also a “bonus fix” for a bug in the pretty-printer exposed by one of the added tests.
r?
Followup to #5022. This is the same, but everything is in `core::rt` now. `std::uv_ll` is moved to `core::unstable::uvll`, with the intent that it eventually move into its own crate (blocked on #5192 at least). I've had to disable the uv tests because of #2064. All of `core::rt` is disabled on platforms that aren't mac or linux until I complete the windows thread local storage bindings and ARM context switching.
My immediate next priorities will be to fix#2064 and clean up the uv bindings, get everything building on all platforms.
Struct and enum representations have some complicatedness that's no longer needed. Now that everything's in one place and has access to anything we'd want to know about the type, flatten some of that out. Slight changes to representations in some cases.
The only thing we really lose is that C-like enums with one variant and a
non-zero discriminant now take up space, but I do not think this is a
common usage. As previously noted, that was mostly there for
transitional compatibility with the pre-adt.rs codebase.
Out goes the extra layer of struct wrapping; the destructedness flag is
added to the end of the struct. This means that, if the struct
previously had alignment padding at the end, the flag will live there
instead of increasing the struct size.
