Commits on Mar 13, 2021

1. Accept type parameters on grammar (e.g. lifetimes) …

   This allows the parser to operate over types like `Token<'code>` by
   supplying the lifetime as a type parameter on the grammar:
   
   ```
   peg::parser! {
       grammar feeny<'a>() for Tokens<'a> {
           // snip
       }
   }
   ```
   
   This should work with all type parameters, not just lifetimes, but
   lifetimes are the motivating example here.
   
   Like @kevinmehall's comment on kevinmehall#220 suggests, this simply adds
   `rust_ty_params()` to `peg_grammar` in the meta-grammar, and then
   threads that through.
   
   If a rule defines it's own type parameters, those come after the
   grammar's type parameters on the parser's exported
   functions/entrypoints.
   
   Fixes kevinmehall#220

   

   bgw committed Mar 13, 2021
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