Struct Callable 

pub struct Callable {
    pub name: &'static str,
    pub required: usize,
    pub max_positional: usize,
    pub named: &'static [&'static str],
    pub required_named: &'static [&'static str],
    pub takes_gain: Option<bool>,
}

Fields

name: &'static str

required: usize

max_positional: usize

named: &'static [&'static str]

required_named: &'static [&'static str]

A subset of named with no default — a caller who omits one gets a refusal, not a fallback. Every builtin leaves this empty today.

takes_gain: Option<bool>