implemented method call

example/run.rs

@@ -1,6 +1,9 @@
 use std::{env::args, fs};
 
-use microlang::{Context, Value};
+use microlang::{
+	eval::{Context, Value},
+	prelude::prelude,
+};
 
 pub fn main() {
 	// Context instantiation.
@@ -15,6 +18,9 @@ pub fn main() {
 		Ok(Value::None)
 	});
 
+	// Import prelude.
+	prelude(&mut context);
+
 	// 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.");