Struct BuiltinSignature 

pub struct BuiltinSignature {
    pub params: Vec<Param>,
}

The parameters a builtin accepts, in positional order.

Fields

params: Vec<Param>

Implementations

impl BuiltinSignature

pub fn positional(&self, index: usize) -> Option<&Param>

The parameter an argument at index binds to; a trailing variadic parameter takes every argument past it. None means the call passed more arguments than the builtin accepts.

pub fn named(&self, name: &str) -> Option<&Param>

pub fn positional_is_lazy(&self, index: usize) -> bool

Whether the positional argument at index is passed unevaluated.

pub fn named_is_lazy(&self, name: &str) -> bool

Whether the named argument name is passed unevaluated.

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

The most positional arguments accepted, or None when variadic.

Trait Implementations

impl Clone for BuiltinSignature

fn clone(&self) -> BuiltinSignature

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BuiltinSignature

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

Formats the value using the given formatter.

impl Default for BuiltinSignature

fn default() -> BuiltinSignature

Returns the “default value” for a type.