use anyhow::{Context, Result};
use num::BigUint;

fn frob(n: u64) -> Result<BigUint> {
    Ok((1..=n)
        .into_iter()        
        .map(|i| BigUint::from(i))
        .reduce(|a, b| a * b)
        .context("fuba")?)
}

fn main() -> Result<()> {
    println!("i8 {}", i8::MAX);
    println!("i16 {}", i16::MAX);
    println!("i32 {}", i32::MAX);
    println!("i64 {}", i64::MAX);
    println!("i128 {}", i128::MAX);
    println!("u8 {}", u8::MAX);
    println!("u16 {}", u16::MAX);
    println!("u32 {}", u32::MAX);
    println!("u64 {}", u64::MAX);
    println!("u128 {}", u128::MAX);
    println!("f32 {}", f32::MAX);
    println!("f64 {}", f64::MAX);
    println!("{}", frob(1000)?);
    Ok(())
}