run-rs 0.3.2

Run a subset of Rust as an interpreted script
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#!/usr/bin/env rust

// Narrowing `as` casts must truncate exactly like compiled Rust. This is the
// shape that proved an earlier interpreter was keeping the full i64 value
// instead of the narrowed one.

fn main() {
    let samples: Vec<i64> = vec![
        0,
        255,
        256,
        300,
        -1,
        -128,
        70000,
        -70000,
        2_147_483_648,
        -2_147_483_649,
    ];
    for value in samples {
        println!(
            "{value}: u8={} i8={} u16={} i16={} u32={} i32={}",
            value as u8, value as i8, value as u16, value as i16, value as u32, value as i32
        );
    }
}