std: Rename io/path features with old_ prefix

This commit renames the features for the `std::old_io` and `std::old_path`
modules to `old_io` and `old_path` to help facilitate migration to the new APIs.

This is a breaking change as crates which mention the old feature names now need
to be renamed to use the new feature names.

[breaking-change]

1 files changed, 1 insertions, 1 deletions

diff --git a/src/liblog/lib.rs b/src/liblog/lib.rs
index 5edb4a96a7d..4dab07acfd2 100644
--- a/src/liblog/lib.rs
+++ b/src/liblog/lib.rs
@@ -171,7 +171,7 @@
 #![feature(box_syntax)]
 #![feature(int_uint)]
 #![feature(core)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(std_misc)]
 #![feature(env)]