This is due to the fact that the new parser doesn't detect the syntax error of "abc def" after it has parsed the full text, but before that happens, the tokenizer has detected a problem (the ''' is not closed) and this is considered incomplete output for code (the same if you do code.compile_command('"""')).

Unfortunately, this is not easy to fix once we have the tokenizer error in place so I am afraid we probably need to close this as "won't fix", unless someone has a good idea on how to accommodate for this case.