cambridge-asm 0.13.0

#[macro_use]
extern crate cambridge_asm;

inst! {
    custom | ctx | override { writeln!(ctx.io.write, "This is a custom instruction").expect("Unable to write to io"); ctx.mar += 1; ctx.gprs[0] = 20;}
}

extend! {
    get_instruction extends cambridge_asm::parse::get_fn; {
        "CUSTOM" => custom,
    }
}

#[test]
fn test_ext() {
    const PROG: &str = r#"LDM #65
OUT
CUSTOM
LDM #0
LDM #1
LDM #14
INC ACC
DEC ACC
LDD NONE
ADD #65
OUT
END


NONE:
"#;
    let mut e = cambridge_asm::parse::parse(
        PROG,
        get_instruction,
        make_io!(std::io::stdin(), std::io::sink()),
    );
    e.exec();
    assert_eq!(e.ctx.acc, 65);
    assert_eq!(e.ctx.gprs[0], 20);
}