Struct Params 

pub struct Params {
    pub params: Vec<Param>,
    pub vararg: Option<String>,
}

A function header’s parameters: the fixed/defaulted positional parameters in order, plus an optional trailing variadic parameter (many rest) that collects the surplus arguments into a List. Required parameters come first, then defaulted ones, then the variadic — the parser enforces that order.

Fields

params: Vec<Param>

vararg: Option<String>

Implementations

impl Params

pub fn is_empty(&self) -> bool

True when the header declares no parameters at all.

pub fn has_vararg(&self) -> bool

Whether a trailing many rest variadic parameter is present.

pub fn required(&self) -> usize

The number of leading parameters with no default — the minimum a call must supply.

pub fn max_positional(&self) -> Option<usize>

The largest number of positional arguments the header can bind without a variadic parameter: every named parameter. None when a variadic is present (unbounded).

pub fn binding_names(&self) -> Vec<String>

The names the body binds: every parameter, then the variadic (which arrives as an already-packed List). This is what the compiled wrapper takes as value parameters.

pub fn render(&self, callee: &str) -> String

The call shape shown in an arity hint, e.g. greet(name, mood = …, many rest).

Trait Implementations

impl Clone for Params

fn clone(&self) -> Params

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Params

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

Formats the value using the given formatter.

impl Default for Params

fn default() -> Params

Returns the “default value” for a type.

impl PartialEq for Params

fn eq(&self, other: &Params) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Params