I just noticed a subtle discrepancy between the old parser and the PEG parser. Consider this syntax error: ``` if x {a}: pass ``` The old parser places the caret at the '{': ``` $ python3.8 -c 'if x { a } : pass' File "<string>", line 1 if x { a } : pass ^ SyntaxError: invalid syntax ``` The PEG parser puts it at 'a': ``` $ python3.10 -c 'if x { a } : pass' File "<string>", line 1 if x { a } : pass ^ SyntaxError: invalid syntax ``` I don't think we should put much effort into fixing it -- it's just a curiosity. I suspect it's got to do with some lookahead.