core: Inherit possible string functionality

This moves as much allocation as possible from teh std::str module into
core::str. This includes essentially all non-allocating functionality, mostly
iterators and slicing and such.

This primarily splits the Str trait into only having the as_slice() method,
adding a new StrAllocating trait to std::str which contains the relevant new
allocation methods. This is a breaking change if any of the methods of "trait
Str" were overriden. The old functionality can be restored by implementing both
the Str and StrAllocating traits.

[breaking-change]

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/hash/sip.rs b/src/libstd/hash/sip.rs
index 3c1d5897e38..58e0f4c717d 100644
--- a/src/libstd/hash/sip.rs
+++ b/src/libstd/hash/sip.rs
@@ -362,7 +362,7 @@ mod tests {
     use prelude::*;
     use num::ToStrRadix;
     use option::{Some, None};
-    use str::{Str,StrSlice};
+    use str::Str;
     use strbuf::StrBuf;
     use slice::{Vector, ImmutableVector};
     use self::test::Bencher;