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Auto merge of #123413 - petrochenkov:delegmulti2, r=fmease

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delegation: Implement list delegation

```rust
reuse prefix::{a, b, c};
```

Using design described in https://github.com/rust-lang/rfcs/pull/3530#issuecomment-2020869823 (the lists are desugared at macro expansion time).
List delegations are expanded eagerly when encountered, similarly to `#[cfg]`s, and not enqueued for later resolution/expansion like regular macros or glob delegation (https://github.com/rust-lang/rust/pull/124135).

Part of https://github.com/rust-lang/rust/issues/118212.
This commit is contained in:
bors 2024-05-15 10:35:31 +00:00
commit 3cb0030fe9
29 changed files with 511 additions and 60 deletions
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4
src/tools/rustfmt/src/items.rs
View file

@ -739,8 +739,8 @@ impl<'a> FmtVisitor<'a> {
(_, Const(..)) => Ordering::Greater,
(MacCall(..), _) => Ordering::Less,
(_, MacCall(..)) => Ordering::Greater,
(Delegation(..), _) => Ordering::Less,
(_, Delegation(..)) => Ordering::Greater,
(Delegation(..), _) | (DelegationMac(..), _) => Ordering::Less,
(_, Delegation(..)) | (_, DelegationMac(..)) => Ordering::Greater,
});
let mut prev_kind = None;
for (buf, item) in buffer {

2
src/tools/rustfmt/src/visitor.rs
View file

@ -586,7 +586,7 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
);
self.push_rewrite(item.span, rewrite);
}
ast::ItemKind::Delegation(..) => {
ast::ItemKind::Delegation(..) | ast::ItemKind::DelegationMac(..) => {
// TODO: rewrite delegation items once syntax is established.
// For now, leave the contents of the Span unformatted.
self.push_rewrite(item.span, None)