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Comment by lucian1900 | Hacker News Reader

> Wait, how don't macro need to take escaped sigils?

These are proper (hygienic) syntax macros, much like Scheme's syntax-rules. C's "macros" only work at the token level.

> Is 'do' still a keyword?

I believe it is still a reserved keyword, but not used anymore.

It appears to not be a reserved word at all:

  $ echo 'fn main() { let do = 1; }' | rustc -

runs with just an unused variable warning (if it were reserved it would fail with "error: `do` is a reserved keyword").

It probably should be reserved.