PPXes I would like to see in OCaml/Reasonml

ppxes-I-would-to-see-in-reasonml.re

let add = (a, b) => a + b;

// modules with test attribute will be stripped from source in production mode
// running `esy test` should find and run all the functions inside test modules
[@test]
module Test {
  [@desciption "1 + 1 is equal to 2"]
  let test_1 = () => {
    Assert.areEqual(2, add(1, 1));
  }
  
  [@description "2 + 2 is equal to 4"]
  let test_2 = () => {
    Assert.are_equal(4, add(2, 2));
  }
};

// this will behave as python's `if __name__ == "__main__":`
[@entry_point]
let main = () => {
  let a = 5;
  a + 1;
};