Document about lifetime

[glyh]

I don't find any information on this. And I run into a cryptic lifetime error with codes generated by lalrpop, so I think it would be helpful if LALRPOP document this.

Specifically, I have lifetime annotation on my AST because I used &str type, but I don't know how to annotate lifetime in the grammar file.

[yannham]

Hello! You're right that it should be documented. In the meantime, here is a real world example of an LALRPOP grammar that uses :

1. The lifetime of the input ('input)
2. Additional custom grammar parameters and lifetimes ('err, 'wcard, src_id, etc.)

I think those parameters are directly reported on the parse method in the module generated by LALRPOP.