ParseElem missing lifetime specifiers

[zsol]

I'd like to write a ParseElem implementation that returns references to the original input - something like:

impl ParseElem<'input> for Vec<Token> {
  type Element = &'input Token;
  fn parse_elem(&'input self, pos: usize) -> RuleResult<Self::Element> {
    match self.get(pos) {
      Some(tok) => RuleResult::Matched(pos + 1, tok),
      None => RuleResult::Failed,
    }
  }
}

But unfortunately with the current ParseElem definition I don't think this is possible. Is there any reason ParseElem doesn't have an explicit lifetime specifier (like ParseSlice does)? And if not, would you accept a PR to implement it?

[kevinmehall]

That seems fine. I don't think there's a reason it was omitted besides that the str and [T] impls didn't need it because they clone the elements.

I'd accept a PR. It is a breaking change, but it can go in 0.8.

[kevinmehall]

Fixed by f09fc34