Changed position terminology

src/main.rs

@@ -1,5 +1,6 @@
 #![forbid(unsafe_code)]
 
+mod ast;
 mod base_55;
 mod brian;
 mod error;
@@ -48,8 +49,8 @@ fn main() {
                     println!(
                         "Error `{:?}` occurred at span: {:?} = `{:?}`",
                         e.kind,
-                        e.position.clone(),
+                        e.span.clone(),
-                        source.slice(e.position)
+                        source.slice(e.span)
                     );
                 }
             }

src/repl.rs

@@ -25,15 +25,15 @@ pub fn repl() {
                         println!(
                             "Error `{:?}` occurred at span: {:?} = `{:?}`",
                             e.kind,
-                            e.position.clone(),
+                            e.span.clone(),
-                            line.slice(e.position.clone())
+                            line.slice(e.span.clone())
                         );
 
                         println!(" | {}", line);
                         println!(
                             "   {}{}-- Here",
-                            " ".repeat(e.position.start),
+                            " ".repeat(e.span.start),
-                            "^".repeat((e.position.end - e.position.start).max(1))
+                            "^".repeat((e.span.end - e.span.start).max(1))
                         );
                     }
                 }