Remove misc. unnecessary statements

src/lib.rs

@@ -1,5 +1,3 @@
-extern crate core;
-
 mod ast;
 mod autofix;
 pub mod cache;

src/main.rs

@@ -1,5 +1,3 @@
-extern crate core;
-
 use std::io;
 use std::path::{Path, PathBuf};
 use std::process::ExitCode;

src/message.rs

@@ -39,7 +39,6 @@ impl fmt::Display for Message {
             f,
             "{}{}{}{}{}{} {} {}",
             relativize_path(Path::new(&self.filename)).white().bold(),
-            // self.filename.white(),
             ":".cyan(),
             self.location.row(),
             ":".cyan(),