Rollup merge of rust-lang#37585 - leodasvacas:change_into_to_from, r=alexcrichton

Change `Into<Vec<u8>> for String` and `Into<OsString> for PathBuf` to From

Fixes rust-lang#37561. First contribution, happy with any and all feedback!

Author: alexcrichton

src/libcollections/string.rs

@@ -1904,10 +1904,10 @@ impl<'a> FromIterator<String> for Cow<'a, str> {
     }
 }
 
-#[stable(feature = "rust1", since = "1.0.0")]
-impl Into<Vec<u8>> for String {
-    fn into(self) -> Vec<u8> {
-        self.into_bytes()
+#[stable(feature = "from_string_for_vec_u8", since = "1.14.0")]
+impl From<String> for Vec<u8> {
+    fn from(string : String) -> Vec<u8> {
+        string.into_bytes()
     }
 }
 

src/libstd/path.rs

@@ -1173,6 +1173,13 @@ impl From<OsString> for PathBuf {
     }
 }
 
+#[stable(feature = "from_path_buf_for_os_string", since = "1.14.0")]
+impl From<PathBuf> for OsString {
+    fn from(path_buf : PathBuf) -> OsString {
+        path_buf.inner
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl From<String> for PathBuf {
     fn from(s: String) -> PathBuf {
@@ -1283,13 +1290,6 @@ impl AsRef<OsStr> for PathBuf {
     }
 }
 
-#[stable(feature = "rust1", since = "1.0.0")]
-impl Into<OsString> for PathBuf {
-    fn into(self) -> OsString {
-        self.inner
-    }
-}
-
 /// A slice of a path (akin to [`str`]).
 ///
 /// This type supports a number of operations for inspecting a path, including