Function lex_invalid

crates/ruff_python_parser/src/lexer.rs:1677–1686

(source: &str, mode: Mode)

    #[track_caller]
    fn lex_invalid(source: &str, mode: Mode) -> LexerOutput {
        let output = lex(source, mode, TextSize::default());

        assert!(
            !output.errors.is_empty(),
            "Expected lexer to generate at least one error for the following source:\n{source}"
        );

        output
    }

    #[track_caller]
    fn lex_source(source: &str) -> LexerOutput {