Consider inserting invisible groups, rather than parens, when applying grouping for precedence
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breaking change
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- Rust
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Description
As of https://github.com/dtolnay/syn/pull/1659, we are currently using code like `token::Paren::default().surround(tokens, |tokens| e.to_tokens(tokens))` .
But maybe a better behavior would be `token::Group::default().surround(...)`.
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