feat: Add support for impl const
#279
Open
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Tracking issue: rust-lang/rust#67792
It's an unstable feature but isn't hard to support, so I thought it can be worth it. It can already be used with stable rustc using the appropriate feature gate.
Note: this change is taken from my fork tree-sitter-rust-orchard. I thought I would open PRs for easily portable changes like this one, even if there is no prospect of them being merged soon given the current maintenance status of this repository (open PRs are a way of making that status clearer). If that is too noisy, let me know and I'll stop.