code.rs

type Op = Fn(u16, u16);

fn op_mov(one: u16, two: u16) {
}

fn op_add(one: u16, two: u16) {
}

fn op_nand(one: u16, two: u16) {
}

fn op_shl(one: u16, two: u16) {
}

fn op_shr(one: u16, two: u16) {
}

fn op_jz(one: u16, two: u16) {
}

fn op_lt(one: u16, two: u16) {
}

fn op_gt(one: u16, two: u16) {
}

fn op_in(one: u16, two: u16) {
}

fn op_out(one: u16, two: u16) {
}

fn main() {
    // Oh come the FUCK on. There has GOT to be a better
    // way than this?!
    let mut methods = std::collections::HashMap::<u16, Box<Op>>::new();

    methods.insert(0b0000, Box::new(op_mov));
    methods.insert(0b0001, Box::new(op_add));
    methods.insert(0b0010, Box::new(op_nand));
    methods.insert(0b0011, Box::new(op_shl));
    methods.insert(0b0100, Box::new(op_shr));
    methods.insert(0b0101, Box::new(op_jz));
    methods.insert(0b0110, Box::new(op_lt));
    methods.insert(0b0111, Box::new(op_gt));
    // No 0b1000-0b1101.
    methods.insert(0b1110, Box::new(op_in));
    methods.insert(0b1111, Box::new(op_out));

    methods.get(0b0000);
}

results.txt

~/dev/tuna-isa/escolar$ cargo run
   Compiling escolar v0.1.0 (file:///home/ellen/dev/tuna-isa/escolar)
src/main.rs:50:17: 50:23 error: mismatched types [E0308]
src/main.rs:50     methods.get(0b0000);
                               ^~~~~~
src/main.rs:50:17: 50:23 help: run `rustc --explain E0308` to see a detailed explanation
src/main.rs:50:17: 50:23 note: expected type `&u16`
src/main.rs:50:17: 50:23 note:    found type `_`
error: aborting due to previous error
error: Could not compile `escolar`.

To learn more, run the command again with --verbose.
~/dev/tuna-isa/escolar$