New submission from anthony shaw: This is related to issue26188,
Using await in a simple statement (outside of an async def method) raises SyntaxError with the unhelpful message "invalid syntax". It seems obvious once you've read PEP492 in detail, but I think that as more and more developers use async/await this will stump lots of people. I've been trying to pick apart where this constraint is raised to see whether I can help with a PR, I've been through Grammar, Parser and then the AST and Compiler. Looking at https://github.com/python/cpython/blob/master/Python/compile.c#L4307-L4319 I can see there are helpful error messages, but during the tokenizer phase it checks that the syntax cannot be used unless you're within an async def method https://github.com/python/cpython/blob/6f0eb93183519024cb360162bdd81b9faec97ba6/Parser/tokenizer.c#L1574-L1583 I can't reproduce this in a REPL for 3.7.0a0, it never gets any further than the grammar or tokenizer phase. ---------- messages: 291398 nosy: anthonypjshaw priority: normal severity: normal status: open title: Compiler "'await' outside function" error message is unreachable versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30029> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
