Enable rust_2018_compatibility lint

In preparation for the switch to using Rust 2018, this change enables
the rust_2018_compatibility lint. Along with that enablement we fix the
warnings emitted by it, which evolve around the module system changes
Rust has gone through and that require us to prefix initial uses of
crate local modules with "crate".

1 files changed, 3 insertions, 2 deletions

diff --git a/nitrocli/src/main.rs b/nitrocli/src/main.rs
index ebc0589..67a0a22 100644
--- a/nitrocli/src/main.rs
+++ b/nitrocli/src/main.rs
@@ -17,8 +17,8 @@
 // * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 // *************************************************************************
 
-
 #![deny(missing_docs)]
+#![warn(rust_2018_compatibility)]
 
 //! Nitrocli is a program providing a command line interface to certain
 //! commands of the Nitrokey Storage device.
@@ -31,13 +31,14 @@ mod error;
 mod nitrokey;
 mod pinentry;
 
-use error::Error;
 use std::mem;
 use std::process;
 use std::result;
 use std::thread;
 use std::time;
 
+use crate::error::Error;
+
 type Result<T> = result::Result<T, Error>;
 type NitroFunc = Fn(&mut libhid::Handle) -> Result<()>;