Meaning of square brackets?

[rrthomas]

The MicroC example seems to use square brackets as an alternative to (…)? (as is conventional), but I can't find it documented.

The documented syntax is used in the CallFunc production, while square brackets are used in various places, e.g. Comparison and Multiplication.

I checked that if I change one of the productions to use (…)? instead of […] then the test result is identical.

If this is indeed correct, I'd be happy to write a small patch for the README.

[rrthomas]

Finally, a check of the source code suggests that I'm right, as in grammar.go, parsing a [ invokes parseOptional.

[alecthomas]

Please use discussions for questions, or the Slack link in the README.