Alex Crichton 4f86653e0d Fix parsing of final on Nightly Rust
This fixes an issue also reported to upstream (rust-lang/rust#62628) to
ensure that we parse the `final` attribute as either `r#final` or
`final`, since now the compiler is giving us `r#final` and we were
previously only accepting `final`.

The parsing here was a bit wonky, but this setup ended up working!
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