Apparently one of the linux bots doesn't have the USER variable defined, and
this fix will likely land more quickly than a fix to the bots.
/// # Example
///
/// ```rust
- /// let user: &'static str = env!("USER");
- /// println!("the user who compiled this code is: {}", user);
+ /// let home: &'static str = env!("HOME");
+ /// println!("the home directory at the time of compiling was: {}", home);
/// ```
#[macro_export]
macro_rules! env( ($name:expr) => ({ /* compiler built-in */ }) )