Revise use of conversion traits

This commit revises `path` and `os_str` to use blanket impls for `From`
on reference types. This both cuts down on the number of required impls,
and means that you can pass through e.g. `T: AsRef<OsStr>` to
`PathBuf::from` without an intermediate call to `as_ref`.

It also makes a FIXME note for later generalizing the blanket impls for
`AsRef` and `AsMut` to use `Deref`/`DerefMut`, once it is possible to do
so.

1 files changed, 0 insertions, 4 deletions

diff --git a/src/libstd/sys/windows/os_str.rs b/src/libstd/sys/windows/os_str.rs
index ad1e6c4b0e7..91905ae7489 100644
--- a/src/libstd/sys/windows/os_str.rs
+++ b/src/libstd/sys/windows/os_str.rs
@@ -45,10 +45,6 @@ impl Buf {
         Buf { inner: Wtf8Buf::from_string(s) }
     }
 
-    pub fn from_str(s: &str) -> Buf {
-        Buf { inner: Wtf8Buf::from_str(s) }
-    }
-
     pub fn as_slice(&self) -> &Slice {
         unsafe { mem::transmute(self.inner.as_slice()) }
     }