Use Literal::subspan to produce better spans from LitStr::parse
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enhancement
help wanted
- Dominant language
- Rust
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Description
LitStr::parse currently puts the entire input string's span on every output token. It would be better to try producing smaller spans using [Literal::subspan](https://docs.rs/proc-macro2/1.0.4/proc_macro2/struct.Literal.html#method.subspan).
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