http: http broken in latest nightly

building http in the latest nightly of rust (2018-3-27 as of this writing) fails. A selection of the errors is below:

error: use of deprecated item 'std::ascii::AsciiExt': use inherent methods instead
  --> src\uri\mod.rs:32:5
   |
32 | use std::ascii::AsciiExt;
   |     ^^^^^^^^^^^^^^^^^^^^
   |
note: lint level defined here
  --> src\lib.rs:160:9
   |
160| #![deny(warnings, missing_docs, missing_debug_implementations)]
   |         ^^^^^^^^
   = note: #[deny(deprecated)] implied by #[deny(warnings)]

error[E0034]: multiple applicable items in scope
   --> src\method.rs:325:9
    |
325 |         Method::try_from(t.as_bytes())
    |         ^^^^^^^^^^^^^^^^ multiple `try_from` found
    |
    = note: candidate #1 is defined in an impl of the trait `std::convert::TryFrom` for the type `_`
note: candidate #2 is defined in the trait `convert::HttpTryFrom`
   --> src\convert.rs:22:5
    |
22  |     fn try_from(t: T) -> Result<Self, Self::Error>;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: to disambiguate the method call, write `convert::HttpTryFrom::try_from(...)` instead

It would seem the recent stabilization of TryFrom as well as the deprecation of AsciiExt have broken http.

Side note: Is Rust allowed to cause breakage like this with new versions of the compiler? I would think that it would be problematic to do so. TryFrom seems to be an issue since it is included in the prelude.