SliceExt not implemented for &[u8]

[mahkoh]

Since SliceExt::split conflicts with BufRead::split, you have to use SliceExt::split(var, cond). But this doesn't give you auto-deref and if var == &&[u8] you get the confusing message that SliceExt is not implemented for &[u8] and you have to first notice that var is &&[u8] and then remember that SliceExt is implemented on [u8] and not &[u8].

[alexcrichton]

The purpose of the SliceExt trait is to provide methods on &[u8], not to provide the ability to abstract over them. Now that we have moved to inherent methods this is even more apparent. As a result this issue is also somewhat moot, so closing.