fix many warnings

examples/repl.rs

@@ -1,16 +1,10 @@
-
-use lamm::{Tokenizer, Parser, Executor};
 use std::io::{self, BufReader};
 
 fn main() {
-	let tokenizer = Tokenizer::new(BufReader::new(io::stdin()));
-	let parser = Parser::new(tokenizer);
-	let values = Executor::new(parser);
-
-	for value in values {
+	for value in lamm::evaluate(BufReader::new(io::stdin())) {
 		match value {
 			Ok(v) => println!("{v}"),
 			Err(e) => eprintln!("{e}"),
 		}
 	}
-}
+}