Do not emit Unknown token

crates/ruff_python_parser/src/parser/expression.rs

@@ -977,12 +977,6 @@ impl<'src> Parser<'src> {
                         });
                     fstring_literal
                 }
-                // `Invalid` tokens are created when there's a lexical error, so
-                // we ignore it here to avoid creating unexpected token errors
-                TokenKind::Unknown => {
-                    self.next_token();
-                    continue;
-                }
                 // Handle an unexpected token
                 _ => {
                     let (tok, range) = self.next_token();

crates/ruff_python_parser/src/token_source.rs

@@ -100,9 +100,7 @@ impl Iterator for TokenSource {
                 }
 
                 Err(error) => {
-                    let location = error.location();
                     self.errors.push(error);
-                    break Some((Tok::Unknown, location));
                 }
             }
         }