core: Inherit what's possible from the num module

This strips out all string-related functionality from the num module. The
inherited functionality is all that will be implemented in libcore (for now).
Primarily, libcore will not implement the Float trait or any string-related
functionality.

It may be possible to migrate string parsing functionality into libcore in the
future, but for now it will remain in libstd.

All functionality in core::num is reexported in std::num.

Author: alexcrichton

src/libcore/lib.rs

@@ -21,6 +21,8 @@
 #![feature(globs, macro_rules, managed_boxes)]
 #![deny(missing_doc)]
 
+pub mod num;
+
 /* Core modules for ownership management */
 
 pub mod cast;