I agree with your point. I tried my best not to sway too far off of some of syntax I've seen in other PEG projects, while also keeping it compatible with Rust's

I agree with your point. I tried my best not to sway too far off of some of syntax I've seen in other PEG projects, while also keeping it compatible with Rust's standard macros. While pest does have this constraint any longer with the new beta, changing the grammar too much would have been a nuisance for anyone who had grammars written in the older versions.