Handle dyn* syntax when rewriting ast::TyKind::TraitObject
#5552
Conversation
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PR on hold until we do a subtree sync and bump the nighty compiler version to one that supports parsing |
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The other thing that's needed is input from the style team relative to how these should be formatted, or at least how we think they should be. Wheels are in motion there |
src/types.rs
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| let shape = if is_dyn { shape.offset_left(4)? } else { shape }; | ||
| let shape = match tobj_syntax { | ||
| ast::TraitObjectSyntax::Dyn => shape.offset_left(4)?, // 4 is offset 'dyn ' | ||
| ast::TraitObjectSyntax::DynStar => shape.offset_left(5)?, // 5 is offset 'dyn* ' |
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hmmm now that I'm thinking about it would it just be better to return None if we get to a DynStart since its experimental syntax?
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Let's do a simple update to ensure rustfmt stops butchering the syntax altogether, but we should hold off on applying formatting for now. This was a topic in recent t-style discussions, but style/formatting rules are being deferred due to other priorities and focus areas |
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I'm gonna bump this because I almost actually just put up my own PR that duplicated this 🤣.
Per nightly style policy, I'm pretty sure that rustfmt can now feel free to begin formatting dyn* more than just ignoring it altogether. Speaking as an individual on T-style, I think treating dyn* as a single token is what we want to do here anyways.
src/types.rs
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| match tobj_syntax { | ||
| ast::TraitObjectSyntax::Dyn => Some(format!("dyn {}", res)), | ||
| ast::TraitObjectSyntax::DynStar => Some(format!("dyn* {}", res)), | ||
| ast::TraitObjectSyntax::None => Some(res), |
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My only nit is that this could be merged into a single match with above,
something like:
let (shape, prefix) = match tobj_syntax {
ast::TraitObjectSyntax::Dyn => (shape.offset_left(4)?, "dyn "),
ast::TraitObjectSyntax::DynStar => (shape.offset_left(5)?, "dyn* "),
ast::TraitObjectSyntax::None => (shape, ""),
};There was a problem hiding this comment.
I'd be happy to make this change since it simplifies the code!
Resolves 5542 Prior to rust-lang/rust#101212 the `ast::TraitObjectSyntax` enum only had two variants `Dyn` and `None`. The PR that introduced the `dyn*` syntax added a new variant `DynStar`, but did not update the formatting rules to account for the new variant. Now the new `DynStar` variant is properly handled and is no longer removed by rustfmt.
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@compiler-errors I made your suggest change. @calebcartwright does your earlier review still apply? |
calebcartwright
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release-notes
Resolves #5542
Prior to rust-lang/rust#101212 the
ast::TraitObjectSyntaxenum only had two variantsDynandNone. The PR that introduced thedyn*syntax added a new variantDynStar, but did not update the formatting rules to account for the new variant.Now the new
DynStarvariant is properly handled and is no longer removed by rustfmt.