Macro non_std::is_slice

macro_rules! is_slice {
    ( $V : expr ) => { ... };
}

Macro to answer the question: is it a slice?

Sample

use is_slice::*;

fn main()
{
  dbg!( is_slice!( Box::new( true ) ) );
  // < is_slice!(Box :: new(true)) = false
  dbg!( is_slice!( &[ 1, 2, 3 ] ) );
  // < is_slice!(& [1, 2, 3]) = false
  dbg!( is_slice!( &[ 1, 2, 3 ][ .. ] ) );
  // < is_slice!(& [1, 2, 3] [..]) = true
}