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, 0 insertions, 7 deletions

diff --git a/src/libstd/io/error.rs b/src/libstd/io/error.rs
index 959c15fcfd6..97c5a29d308 100644
--- a/src/libstd/io/error.rs
+++ b/src/libstd/io/error.rs
@@ -172,13 +172,6 @@ impl Error {
         Error { repr: Repr::Os(code) }
     }
 
-    /// Creates a new instance of an `Error` from a particular OS error code.
-    #[unstable(feature = "io", reason = "deprecated")]
-    #[deprecated(since = "1.0.0", reason = "renamed to from_raw_os_error")]
-    pub fn from_os_error(code: i32) -> Error {
-        Error { repr: Repr::Os(code) }
-    }
-
     /// Returns the OS error that this error represents (if any).
     ///
     /// If this `Error` was constructed via `last_os_error` then this function