STYLE: extern and use statements rules

STYLE

@@ -1,6 +1,8 @@
 0. Braces are mandatory for all control flow, as it improves the visibility of
 scope.
+
 1. Nested indentation should be kept to a minimum.
+
 2. Empty lines should be placed between different kinds of statements:
 
 	int t;
@@ -69,6 +71,17 @@
 	#include <unistd.h> /* close(2), getopt(3), lseek(2), read(2), write(2),
                          * optarg, optind, STDIN_FILENO, STDOUT_FILENO */
 
+10. In Rust, place extern statements after use statements that include standard
+library crates. Group alike statements:
+
+	use std::fs::Path;
+
+	extern crate strerror;
+	extern crate sysexits;
+
+	use strerror::StrError;
+	use sysexits::{ EX_OSERR, EX_USAGE };
+
 --
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