nom::dbg_dmp!

macro_rules! dbg_dmp {
    ($i: expr, $submac:ident!( $($args:tt)* )) => { ... };
    ($i:expr, $f:ident) => { ... };
}

Prints a message and the input if the parser fails

The message prints the Error or Incomplete and the parser's calling code.

It also displays the input in hexdump format

   named!(f, dbg_dmp!( tag!( "abcd" ) ) );

   let a = &b"efghijkl"[..];

   // Will print the following message:
   // Error(Position(0, [101, 102, 103, 104, 105, 106, 107, 108])) at l.5 by ' tag ! ( "abcd" ) '
   // 00000000        65 66 67 68 69 6a 6b 6c         efghijkl
   f(a);