add extra module

Author: colbyn

src/extra.rs

@@ -0,0 +1,3 @@
+//! extra stuff
+
+pub const NOPTS_VALUE: i64 = -9223372036854775808;

src/lib.rs

@@ -1,3 +1,4 @@
 #![allow(unused)]
 pub mod sys;
-pub mod api;
+pub mod api;
+pub mod extra;

src/main.rs

@@ -1,6 +1,7 @@
 #![allow(unused)]
 pub mod sys;
 pub mod api;
+pub mod extra;
 
 fn main() {