fix(errors): unexpected char errors were pointing one char too far

notes.org

@@ -185,6 +185,10 @@ CLOCK: [2025-05-04 dim. 14:01]--[2025-05-04 dim. 14:14] =>  0:13
 :EFFORT:   10
 :END:
 
-* TODO error offsets are incorrect
+* DONE error offsets are incorrect
 
 * TODO remove old FromStr parser implementation
+
+* TODO use a better readline impl
+
+* TODO handle non-interactive input better

src/tokens.rs

@@ -216,11 +216,12 @@ impl Tokenizer {
                 } else if c.is_whitespace() {
                     self.advance();
                 } else {
-                    self.advance();
+                    let result = Err(ScanError {
-                    return Err(ScanError {
                         location: self.current_location(1),
                         kind: ScanErrorKind::UnexpectedChar(c),
                     });
+                    self.advance();
+                    return result;
                 }
             } else {
                 return Ok(None);