delegation: Implement list delegation #123413

petrochenkov · 2024-04-03T13:46:04Z

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

Using design described in rust-lang/rfcs#3530 (comment) (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 (#124135).

Part of #118212.

rustbot · 2024-04-03T13:46:12Z

r? @fmease

rustbot has assigned @fmease.
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fmease · 2024-04-12T23:26:13Z

Wait, this conflicts with #122500, which one should I review first?

petrochenkov · 2024-04-13T11:49:50Z

@fmease
Any order should be fine.

rustbot · 2024-04-19T17:54:29Z

Some changes occurred in src/tools/rustfmt

cc @rust-lang/rustfmt

petrochenkov · 2024-04-19T17:58:13Z

Based on the experience of implementing glob delegation in #124135, I changed the implementation here from using DelegationKind to using a new ItemKind for delegation lists, which is treated similarly to ItemKind::MacCall.
It requires touching more code, but the result is clearer.
(I also found missing pretty-printing this way, and fixed it.)

petrochenkov · 2024-04-24T16:35:29Z

@fmease
I rebased and changed the treatment of DelegationMac in expand.rs to be more similar to other macros.

fmease

Sorry for the long delay 😞

r=me after rebase & with suggestions & questions addressed.

compiler/rustc_ast/src/mut_visit.rs

compiler/rustc_ast_lowering/src/item.rs

fmease · 2024-05-14T12:41:14Z

compiler/rustc_ast_pretty/src/pprust/state/item.rs

+        }
+        if let Some(suffixes) = suffixes {
+            self.word("::");
+            self.word("{");


(minor, not blocking) could maybe use one of ibox, cbox

I'll leave this for some later time.

compiler/rustc_ast_pretty/src/pprust/state/item.rs

compiler/rustc_expand/src/expand.rs

compiler/rustc_parse/src/parser/item.rs

tests/ui/delegation/list.rs

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

petrochenkov · 2024-05-14T23:36:26Z

@rustbot ready

fmease

Thanks!

fmease · 2024-05-15T09:42:08Z

@bors r+

bors · 2024-05-15T09:42:10Z

📌 Commit c30b410 has been approved by fmease

It is now in the queue for this repository.

bors · 2024-05-15T10:35:34Z

⌛ Testing commit c30b410 with merge 3cb0030...

bors · 2024-05-15T12:42:34Z

☀️ Test successful - checks-actions
Approved by: fmease
Pushing 3cb0030 to master...

rust-timer · 2024-05-15T13:57:22Z

Finished benchmarking commit (3cb0030): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.4%	[-0.5%, -0.4%]	2
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (secondary 2.1%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.1%	[2.1%, 2.1%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 678.182s -> 679.399s (0.18%)
Artifact size: 316.22 MiB -> 316.22 MiB (-0.00%)

Update Rust toolchain from nightly-2024-05-15 to nightly-2024-05-16 without any other source changes. This is an automatically generated pull request. If any of the CI checks fail, manual intervention is required. In such a case, review the changes at https://github.com/rust-lang/rust from rust-lang@8387315 up to rust-lang@1871252. The log for this commit range is: rust-lang@1871252fc8 Auto merge of rust-lang#125164 - fmease:rollup-s5vwzlg, r=fmease rust-lang@734a109998 Rollup merge of rust-lang#125159 - fmease:allow-unauth-labels-l-pg-z, r=jieyouxu rust-lang@601e5d199f Rollup merge of rust-lang#125154 - FractalFir:fnabi_doc, r=compiler-errors rust-lang@09156291e5 Rollup merge of rust-lang#125146 - Oneirical:panic-impl, r=jieyouxu rust-lang@80f991e09b Rollup merge of rust-lang#125142 - GuillaumeGomez:migrate-rustdoc-themes, r=jieyouxu rust-lang@c5b17ec9d2 Rollup merge of rust-lang#125003 - RalfJung:aligned_alloc, r=cuviper rust-lang@257d222e4b Improved the documentation of the FnAbi struct rust-lang@72a48fc68c Allow unauthenticated users to modify `L-*`, `PG-*` and `-Z*` labels rust-lang@b21b74b5e6 Auto merge of rust-lang#125134 - compiler-errors:negative-traits-are-not-notable, r=fmease rust-lang@a7484d2e49 fix tidy rust-lang@cae17ff42b rewrite panic-impl-transitive rust-lang@ade234d574 Auto merge of rust-lang#125144 - fmease:rollup-4uft293, r=fmease rust-lang@8d38f2fb11 Rollup merge of rust-lang#125137 - RalfJung:mir-sh, r=scottmcm rust-lang@2659ff3882 Rollup merge of rust-lang#125104 - Oneirical:test6, r=jieyouxu rust-lang@4f7d9d4ad8 Rollup merge of rust-lang#125038 - ivan-shrimp:checked_sub, r=joboet rust-lang@2804d4223b Rollup merge of rust-lang#125027 - Oneirical:c-test-with-remove, r=jieyouxu rust-lang@2e70bea168 Rollup merge of rust-lang#124975 - lu-zero:move_file, r=clubby789 rust-lang@3873a74f8a Rollup merge of rust-lang#124307 - reitermarkus:escape-debug-size-hint-inline, r=joboet rust-lang@3cb0030fe9 Auto merge of rust-lang#123413 - petrochenkov:delegmulti2, r=fmease rust-lang@c765480efe Migrate `run-make/rustdoc-themes` to new rmake rust-lang@c87ae947eb Add new `htmldocck` function to `run-make-support` rust-lang@a71c3ffce9 Auto merge of rust-lang#125032 - compiler-errors:crash-dump-dir, r=onur-ozkan rust-lang@0afd50e852 MIR operators: clarify Shl/Shr handling of negative offsets rust-lang@44fa5fd39a Auto merge of rust-lang#125136 - matthiaskrgr:rollup-ljm15m3, r=matthiaskrgr rust-lang@5f1a120ee5 Rollup merge of rust-lang#125135 - chenyukang:yukang-fix-116502, r=compiler-errors rust-lang@f7c2934420 Rollup merge of rust-lang#125132 - mejrs:diag, r=compiler-errors rust-lang@a8ff937b07 Rollup merge of rust-lang#125108 - Zalathar:info-bitmap-bytes, r=nnethercote rust-lang@03ff673dcc Rollup merge of rust-lang#124990 - fmease:expand-weak-aliases-within-cts, r=compiler-errors rust-lang@75895f59b0 Fix the dedup error because of spans from suggestion rust-lang@9e7aff7945 Auto merge of rust-lang#125031 - Oneirical:dynamic-libs, r=jieyouxu rust-lang@8994840f7e rustdoc: Negative impls are not notable rust-lang@91a3f04a3f fix the test rust-lang@0160bff4b1 Auto merge of rust-lang#125084 - Jules-Bertholet:fix-125058, r=Nadrieril rust-lang@c30b41012d delegation: Implement list delegation rust-lang@18d7411719 Add `on_unimplemented" typo suggestions rust-lang@81f7e54962 Port issue-11908 to rmake rust-lang@1f61cc3078 port no-cdylib-as-rdylib test rust-lang@b1e5e5161a remove cxx_flags rust-lang@1f5837ae25 rewrite c-link-to-rust-staticlib rust-lang@5cc020d3df avoid using aligned_alloc; posix_memalign is better-behaved rust-lang@c81be68fb4 coverage: Remove confusing comments from `CoverageKind` rust-lang@bfadc3a9b9 coverage: `CoverageIdsInfo::mcdc_bitmap_bytes` is never needed rust-lang@fe8f66e4bc `rustc_hir_typeck`: Account for `skipped_ref_pats` in `expr_use_visitor` rust-lang@4db00fe229 Use an helper to move the files rust-lang@7fde7308bf reverse condition in `uN::checked_sub` rust-lang@848f3c2c6e Make crashes dump mir to build dir rust-lang@35a5be2833 Also expand weak alias tys inside consts inside `expand_weak_alias_tys` rust-lang@4edf12d33e Improve escape methods. rust-lang@16981ba406 Avoid panicking branch in `EscapeIterInner`. rust-lang@e3fc97be2b Inline `EscapeDebug::size_hint`. Co-authored-by: celinval <35149715+celinval@users.noreply.github.com> Co-authored-by: Zyad Hassan <88045115+zhassan-aws@users.noreply.github.com>

delegation: Implement glob delegation Support delegating to all trait methods in one go. Overriding globs with explicit definitions is also supported. The implementation is generally based on the design from rust-lang/rfcs#3530 (comment), but unlike with list delegation in rust-lang#123413 we cannot expand glob delegation eagerly. We have to enqueue it into the queue of unexpanded macros (most other macros are processed this way too), and then a glob delegation waits in that queue until its trait path is resolved, and enough code expands to generate the identifier list produced from the glob. Glob delegation is only allowed in impls, and can only point to traits. Supporting it in other places gives very little practical benefit, but significantly raises the implementation complexity. Part of rust-lang#118212.

Rollup merge of rust-lang#124135 - petrochenkov:deleglob, r=fmease delegation: Implement glob delegation Support delegating to all trait methods in one go. Overriding globs with explicit definitions is also supported. The implementation is generally based on the design from rust-lang/rfcs#3530 (comment), but unlike with list delegation in rust-lang#123413 we cannot expand glob delegation eagerly. We have to enqueue it into the queue of unexpanded macros (most other macros are processed this way too), and then a glob delegation waits in that queue until its trait path is resolved, and enough code expands to generate the identifier list produced from the glob. Glob delegation is only allowed in impls, and can only point to traits. Supporting it in other places gives very little practical benefit, but significantly raises the implementation complexity. Part of rust-lang#118212.

rustbot assigned fmease Apr 3, 2024

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delegation: Implement glob delegation #124135

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petrochenkov changed the title ~~delegation: Implement multi-item delegation~~ delegation: Implement list delegation Apr 19, 2024

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petrochenkov force-pushed the delegmulti2 branch 2 times, most recently from bf178ca to c60d449 Compare April 24, 2024 16:33

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fmease added the F-fn_delegation `#![feature(fn_delegation)]` label May 14, 2024

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Tracking Issue for function delegation (fn_delegation, RFC 3530) #118212

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fmease added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 14, 2024

delegation: Implement list delegation

c30b410

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

petrochenkov force-pushed the delegmulti2 branch from 6dbe452 to c30b410 Compare May 14, 2024 23:35

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delegation: Implement list delegation #123413

delegation: Implement list delegation #123413

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delegation: Implement list delegation #123413

delegation: Implement list delegation #123413

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Overall result: ✅ improvements - no action needed

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