std: Remove deprecated/unstable num functionality

This commit removes all the old casting/generic traits from `std::num` that are
no longer in use by the standard library. This additionally removes the old
`strconv` module which has not seen much use in quite a long time. All generic
functionality has been supplanted with traits in the `num` crate and the
`strconv` module is supplanted with the [rust-strconv crate][rust-strconv].

[rust-strconv]: https://github.com/lifthrasiir/rust-strconv

This is a breaking change due to the removal of these deprecated crates, and the
alternative crates are listed above.

[breaking-change]

1 files changed, 8 insertions, 3 deletions

diff --git a/src/libcore/nonzero.rs b/src/libcore/nonzero.rs
index db2d1b2f1fd..9ea44c39fe9 100644
--- a/src/libcore/nonzero.rs
+++ b/src/libcore/nonzero.rs
@@ -10,12 +10,17 @@
 
 //! Exposes the NonZero lang item which provides optimization hints.
 
-use marker::{Sized, MarkerTrait};
+use marker::Sized;
 use ops::Deref;
+#[cfg(stage0)] use marker::MarkerTrait;
 
 /// Unsafe trait to indicate what types are usable with the NonZero struct
-#[allow(deprecated)]
-pub unsafe trait Zeroable : MarkerTrait {}
+#[cfg(not(stage0))]
+pub unsafe trait Zeroable {}
+
+/// Unsafe trait to indicate what types are usable with the NonZero struct
+#[cfg(stage0)]
+pub unsafe trait Zeroable: MarkerTrait {}
 
 unsafe impl<T:?Sized> Zeroable for *const T {}
 unsafe impl<T:?Sized> Zeroable for *mut T {}