sed -i -s 's/#\[deriving(/#\[derive(/g' **/*.rs

src/libstd/path/posix.rs

@@ -35,7 +35,7 @@ pub type StrComponents<'a> =
     Map<&'a [u8], Option<&'a str>, Components<'a>, fn(&[u8]) -> Option<&str>>;
 
 /// Represents a POSIX file path
-#[deriving(Clone)]
+#[derive(Clone)]
 pub struct Path {
     repr: Vec<u8>, // assumed to never be empty or contain NULs
     sepidx: Option<uint> // index of the final separator in repr

src/libstd/path/windows.rs

@@ -78,7 +78,7 @@ pub type Components<'a> =
 //
 // The only error condition imposed here is valid utf-8. All other invalid paths are simply
 // preserved by the data structure; let the Windows API error out on them.
-#[deriving(Clone)]
+#[derive(Clone)]
 pub struct Path {
     repr: String, // assumed to never be empty
     prefix: Option<PathPrefix>,
@@ -969,7 +969,7 @@ pub fn is_sep_byte_verbatim(u: &u8) -> bool {
 }
 
 /// Prefix types for Path
-#[deriving(Copy, PartialEq, Clone, Show)]
+#[derive(Copy, PartialEq, Clone, Show)]
 pub enum PathPrefix {
     /// Prefix `\\?\`, uint is the length of the following component
     VerbatimPrefix(uint),