first documentation run

src/native_functions.rs

@@ -11,6 +11,7 @@ use crate::{
     value::{CallableType, Value},
 };
 
+/// Native clock function that returns the current time in seconds since the Unix epoch
 struct Clock;
 
 impl Callable for Clock {
@@ -22,6 +23,7 @@ impl Callable for Clock {
         0
     }
 
+    /// Return the current system time in seconds since the Unix epoch
     fn call(
         &self,
         _interpreter: &mut Interpreter,
@@ -36,6 +38,7 @@ impl Callable for Clock {
     }
 }
 
+/// Return all native functions available to the Lox interpreter
 pub fn all() -> Vec<(String, Value)> {
     vec![(
         "clock".into(),