Any — Mew

any holds a value of any type. Every type widens into one on its own, so assigning into an any needs nothing written.

mew

let number: any = 32;
let text: any = "hello";
let numbers: any = new i32[] { 1, 2, 3 };
let nothing: any = null;

The only thing that does not go in is void, because a function that returns nothing produces no value to widen.

Nothing is reachable through it

An any says nothing about what is in there, so no field, method or operator reaches through one.

mew

pub type Point {
    pub field x: i32;
    pub field y: i32;
}
  
let boxed: any = new Point { x: 32, y: 40 };
let x = boxed.x;

Error [MEW2029]: Field does not exist
The field 'x' does not exist within type 'any'

Getting the value back out is a cast, and is is what asks what is in there first.

mew

use std;
  
pub type Point {
    pub field x: i32;
    pub field y: i32;
}
  
let boxed: any = new Point { x: 32, y: 40 };
  
if boxed is Point {
    println($"{(boxed as Point).x}");
}