(Maybe) require semicolons between arms

[nrc]

Because macro_rules does.

[peter-lyons-kehl]

Semicolons between arms could be optional, and then implementing this would be a non-breakable/minor version change. However, to keep consistent with macro_rules!, and as a safeguard, plus also to minimise confusion, suggest to make these semicolons required. (That's for if and when you/someone implements it - I'm not asking for it, I just noticed the difference from macro_rules!).