Debugging

Currently, Cairo does not support a debugging mechanism per se, but we can print variables' values to the standard output.

Printing to stdout

In order to print a variable's value to the standard output, we have to use PrintTrait:

use array::ArrayTrait;
use protostar_print::PrintTrait;
use result::ResultTrait;

#[test]
fn test_print_basic() {
  1.print();

  'hello'.print();

  let mut array = ArrayTrait::new();
  array.append('veni');
  array.append('vidi');
  array.append('vici');
  array.print();

  (1 == 2).print();

  true.print();

  assert(1 == 1, 'xxx');
}

You can print numbers, booleans, and Cairo short strings as well as arrays containing values of these types.