Enum Piece 

pub enum Piece {
    Var {
        name: &'static str,
        index: usize,
    },
    Int(i128),
    App {
        head: &'static str,
        arity: usize,
    },
}

One piece of a replacement, in the pre-order that builds it.

Variants

Var

Whatever the pattern bound at this position.

Fields

name: &'static str

The name the rule gave it, for anything that has to say what it did.

index: usize

Which binding of the match it is.

Int(i128)

A constant written in the rule.

App

A machine term, which is an instruction once the selector has built it.

Fields

head: &'static str

The name in head position.

arity: usize

How many arguments it takes.

Trait Implementations

impl Debug for Piece

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.