rust-crafting-interpreters-.../src/interpreter/callable.rs

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/// A callable is some object that supports being called.
pub trait Callable {
/// Return the amount of arguments supported by the callable.
fn arity(&self) -> usize;
/// Run the callable in the execution environment with the specified
/// arguments.
fn call(
&self,
environment: &mut Environment,
arguments: &Vec<Value>,
) -> Result<Value, InterpreterError>;
}