explicit library api and remove dependency on stack overflow introspection tool

example/repl.rs

@@ -3,7 +3,6 @@ use std::io::{stdin, stdout, Write};
 use microlang::Context;
 
 pub fn main() {
-	unsafe { backtrace_on_stack_overflow::enable() };
 	let mut context = Context::empty();
 	loop {
 		print!("> ");

example/run.rs

@@ -3,8 +3,10 @@ use std::{env::args, fs};
 use microlang::{Context, Value};
 
 pub fn main() {
-	unsafe { backtrace_on_stack_overflow::enable() };
+	// Context instantiation.
 	let mut context = Context::empty();
+
+	// Definition of built-in function.
 	context.define_built("print", |values, _| {
 		for val in values {
 			print!("{} ", val.serialize());
@@ -13,9 +15,14 @@ pub fn main() {
 		Ok(Value::None)
 	});
 
+	// Script to evaluate.
 	let lines = fs::read_to_string(args().nth(1).expect("Pass a file as arg 1.")).expect("File could not be read.");
+
+	// Script evaluation.
 	match context.eval(lines) {
+		// May return errors raised during parsing or actual evaluation.
 		Err(err) => panic!("Failed : {err:?}"),
+		// Success returns the parsed AST alongside the value resulting from the evaluation.
 		Ok((_, value)) => println!("{}", value.serialize()),
 	}
 }