Remove no longer required dependencies

With the update to rand 0.6.4 we no longer require the dependencies to
rustc_version, semver, and semver-parser. Hence, this change removes
them.

Delete subrepo rustc_version/:rustc_version
Delete subrepo semver/:semver
Delete subrepo semver-parser/:semver-parser

1 files changed, 0 insertions, 79 deletions

diff --git a/rustc_version/src/errors.rs b/rustc_version/src/errors.rs
deleted file mode 100644
index 54557b6..0000000
--- a/rustc_version/src/errors.rs
+++ /dev/null
@@ -1,79 +0,0 @@
-use std::{self, error, fmt, io, str};
-use semver::{self, Identifier};
-
-/// The error type for this crate.
-#[derive(Debug)]
-pub enum Error {
-    /// An error ocurrend when executing the `rustc` command.
-    CouldNotExecuteCommand(io::Error),
-    /// The output of `rustc -vV` was not valid utf-8.
-    Utf8Error(str::Utf8Error),
-    /// The output of `rustc -vV` was not in the expected format.
-    UnexpectedVersionFormat,
-    /// An error ocurred in parsing a `VersionReq`.
-    ReqParseError(semver::ReqParseError),
-    /// An error ocurred in parsing the semver.
-    SemVerError(semver::SemVerError),
-    /// The pre-release tag is unknown.
-    UnknownPreReleaseTag(Identifier),
-}
-use Error::*;
-
-impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        use std::error::Error;
-        match *self {
-            CouldNotExecuteCommand(ref e) => write!(f, "{}: {}", self.description(), e),
-            Utf8Error(_) => write!(f, "{}", self.description()),
-            UnexpectedVersionFormat => write!(f, "{}", self.description()),
-            ReqParseError(ref e) => write!(f, "{}: {}", self.description(), e),
-            SemVerError(ref e) => write!(f, "{}: {}", self.description(), e),
-            UnknownPreReleaseTag(ref i) => write!(f, "{}: {}", self.description(), i),
-        }
-    }
-}
-
-impl error::Error for Error {
-    fn cause(&self) -> Option<&error::Error> {
-        match *self {
-            CouldNotExecuteCommand(ref e) => Some(e),
-            Utf8Error(ref e) => Some(e),
-            UnexpectedVersionFormat => None,
-            ReqParseError(ref e) => Some(e),
-            SemVerError(ref e) => Some(e),
-            UnknownPreReleaseTag(_) => None,
-        }
-    }
-
-    fn description(&self) -> &str {
-        match *self {
-            CouldNotExecuteCommand(_) => "could not execute command",
-            Utf8Error(_) => "invalid UTF-8 output from `rustc -vV`",
-            UnexpectedVersionFormat => "unexpected `rustc -vV` format",
-            ReqParseError(_) => "error parsing version requirement",
-            SemVerError(_) => "error parsing version",
-            UnknownPreReleaseTag(_) => "unknown pre-release tag",
-        }
-    }
-}
-
-macro_rules! impl_from {
-    ($($err_ty:ty => $variant:ident),* $(,)*) => {
-        $(
-            impl From<$err_ty> for Error {
-                fn from(e: $err_ty) -> Error {
-                    Error::$variant(e)
-                }
-            }
-        )*
-    }
-}
-
-impl_from! {
-    str::Utf8Error => Utf8Error,
-    semver::SemVerError => SemVerError,
-    semver::ReqParseError => ReqParseError,
-}
-
-/// The result type for this crate.
-pub type Result<T> = std::result::Result<T, Error>;