Support #[cxx_name = "operator+="], etc. (i.e. not just C identifiers). #1689
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Before this commit, `cxx` wouldn't detect the problem, and later the C++ compilation would fail. After this commit, the error is detected early. This commit seems desirable on its own, but it also helps to build scaffolding for enabling additional checks in follow-up commits (e.g. allowing `operator==` for function names, but not for other `[cxx::bridge]` API names).
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PTAL?
This came up in https://crrev.com/c/7253816/comment/3f283bcf_9ab0850a/
and in #109 (comment)
Some additional notes:
check_reserved_nametocheck_type_namein the 1st commit, because 1) it is called only for type names, and 2) in the 1st commit I also introducecheck_nameand in the 2nd commitcheck_fn_namereport_errorin the newfn check_nameI kind of lie when callingtokens.set_span(the span of#[cxx_name...]'s arg is not the same as the span of the ident). But it seems to work ok for error reporting, so hopefully this is fine.