gistfile1.txt

   Compiling rustbook v0.3.0 (file:///home/simias/src/rustbook)
src/main.rs:13:1: 13:18 error: unstable feature
src/main.rs:13 #![feature(core)]
               ^~~~~~~~~~~~~~~~~
note: this feature may not be used in the beta release channel
src/main.rs:14:1: 14:25 error: unstable feature
src/main.rs:14 #![feature(exit_status)]
               ^~~~~~~~~~~~~~~~~~~~~~~~
note: this feature may not be used in the beta release channel
src/main.rs:15:1: 15:21 error: unstable feature
src/main.rs:15 #![feature(rustdoc)]
               ^~~~~~~~~~~~~~~~~~~~
note: this feature may not be used in the beta release channel
src/main.rs:16:1: 16:27 error: unstable feature
src/main.rs:16 #![feature(rustc_private)]
               ^~~~~~~~~~~~~~~~~~~~~~~~~~
note: this feature may not be used in the beta release channel
src/main.rs:17:1: 17:32 error: unstable feature
src/main.rs:17 #![feature(path_relative_from)]
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
note: this feature may not be used in the beta release channel
error: aborting due to 5 previous errors
Could not compile `rustbook`.