Function parse 

pub fn parse(
    text: &str,
    names: &mut Interner,
    regs: &RegFile,
) -> Result<Vec<Func>, ParseError>

Reads every function in the text the printer writes.

Names are interned into names, and physical registers are the ones regs describes, which are the two things the printer was given.

Errors

Gives back the first thing in the text that does not add up, with the line it is on.