std: Deprecate std::old_io::fs

This commit deprecates the majority of std::old_io::fs in favor of std::fs and
its new functionality. Some functions remain non-deprecated but are now behind a
feature gate called `old_fs`. These functions will be deprecated once
suitable replacements have been implemented.

The compiler has been migrated to new `std::fs` and `std::path` APIs where
appropriate as part of this change.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/rustbook/help.rs b/src/rustbook/help.rs
index 7fd8214f731..995d2f2494a 100644
--- a/src/rustbook/help.rs
+++ b/src/rustbook/help.rs
@@ -19,7 +19,7 @@ struct Help;
 
 pub fn parse_cmd(name: &str) -> Option<Box<Subcommand>> {
     match name {
-        "help" | "--help" | "-h" | "-?" => Some(box Help as Box<Subcommand>),
+        "help" | "--help" | "-h" | "-?" => Some(Box::new(Help)),
         _ => None
     }
 }