Add doc and smoke test

Author: richard-uk1

src/macros.rs

@@ -89,8 +89,10 @@ macro_rules! closure (
 /// // will use &[u8] as input type (use this if the compiler
 /// // complains about lifetime issues
 /// named!(my_function<&[u8]>,            tag!("abcd"));
-/// //prefix them with 'pub' to make the functions public
+/// // prefix them with 'pub' to make the functions public
 /// named!(pub my_function,               tag!("abcd"));
+/// // prefix them with 'pub(crate)' to make the functions public within the crate
+/// named!(pub(crate) my_function,               tag!("abcd"));
 /// ```
 #[macro_export]
 macro_rules! named (
@@ -1298,6 +1300,17 @@ mod tests {
     assert_eq!(res, Done(&b""[..], a));
   }
 
+  mod pub_crate_named_mod {
+    named!(pub(crate) tst, tag!("abcd"));
+  }
+
+  #[test]
+  fn pub_crate_named_test() {
+    let a = &b"abcd"[..];
+    let res = pub_crate_named_mod::tst(a);
+    assert_eq!(res, Done(&b""[..], a));
+  }
+
   #[test]
   fn apply_test() {
     fn sum2(a:u8, b:u8)       -> u8 { a + b }