Replace `tcx.mk_trait_ref` with `TraitRef::new` #110806

WaffleLapkin · 2023-04-25T16:14:57Z

First step in implementing rust-lang/compiler-team#616
r? @lcnr

In rust `new`-ish functions are usually the first ones in an `impl` block

rustbot · 2023-04-25T16:15:06Z

Some changes occurred to the core trait solver

cc @rust-lang/initiative-trait-system-refactor

Some changes occurred in engine.rs, potentially modifying the public API of ObligationCtxt.

cc @lcnr, @compiler-errors

compiler/rustc_hir_analysis/src/bounds.rs

rustbot · 2023-04-25T16:45:30Z

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

Noratrieb · 2023-04-25T16:45:47Z

compiler/rustc_trait_selection/src/solve/trait_goals.rs

-            ty::Binder::dummy(
-                tcx.mk_trait_ref(goal.predicate.def_id(), [self_ty, generator.resume_ty()]),
-            )
+            ty::Binder::dummy(ty::TraitRef::new(


ty::TraitRef::new starts getting pretty verbose, maybe we should start with some use ty::TraitRef;? unsure about the types opinion on that

I don't have an opinion here and expect the same for most (if not all) types members 😁 afaik we tend to already not have a consistent approach to which parts of ty to import

lcnr

some nits and further cleanup ideas

feel free to implement whichever ones you want

after that r=me

compiler/rustc_borrowck/src/type_check/mod.rs

compiler/rustc_hir_typeck/src/coercion.rs

compiler/rustc_middle/src/ty/sty.rs

compiler/rustc_trait_selection/src/traits/project.rs

…stead}`

lcnr · 2023-04-25T19:17:40Z

please relabel once this is ready for the final review + merge 😁

@rustbot author

lcnr · 2023-04-25T19:17:54Z

(or just r+ it yourself 😁 )

…t` and a `Span`

…::Binber::dummy` calls

WaffleLapkin · 2023-04-26T12:05:49Z

I've substantially changed everything with the review suggestions, so @rustbot ready

WaffleLapkin · 2023-04-26T12:23:08Z

One day I'll stop forgetting to fix {rustdoc, clippy, miri} after my compiler changes... One day... But not today it seems

jackh726 · 2023-04-26T13:24:36Z

Please don't land, see comment.

jackh726 · 2023-04-26T13:28:08Z

compiler/rustc_middle/src/ty/mod.rs


+impl<'tcx> ToPredicate<'tcx, PolyTraitPredicate<'tcx>> for TraitRef<'tcx> {
+    fn to_predicate(self, tcx: TyCtxt<'tcx>) -> PolyTraitPredicate<'tcx> {
+        ty::Binder::dummy(self).to_predicate(tcx)


Nope, this is not a change we should merge (or the impl below).

In fact, I would be in favor of some explicit negative impl here just so we can slap a big comment on this so nobody tries to make the positive impl again.

Can you explain what is wrong in this impl?

Ah, I see: #110806 (comment)

lcnr · 2023-05-03T20:21:51Z

@bors r+ rollup=iffy

bors · 2023-05-03T20:21:53Z

📌 Commit 689721d has been approved by lcnr

It is now in the queue for this repository.

bors · 2023-05-04T05:54:13Z

⌛ Testing commit 689721d with merge 6f8c055...

bors · 2023-05-04T08:52:49Z

☀️ Test successful - checks-actions
Approved by: lcnr
Pushing 6f8c055 to master...

rust-timer · 2023-05-04T10:39:42Z

Finished benchmarking commit (6f8c055): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

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

Max RSS (memory usage)

Results

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)	1.2%	[1.0%, 1.3%]	2
Regressions ❌ (secondary)	2.3%	[2.3%, 2.3%]	1
Improvements ✅ (primary)	-2.4%	[-2.4%, -2.4%]	1
Improvements ✅ (secondary)	-1.3%	[-2.2%, -1.0%]	5
All ❌✅ (primary)	-0.0%	[-2.4%, 1.3%]	3

Cycles

Results

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-11.3%	[-14.2%, -8.5%]	6
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 656.223s -> 655.069s (-0.18%)

Replace `tcx.mk_trait_ref` with `TraitRef::new` First step in implementing rust-lang/compiler-team#616 r? `@lcnr`

WaffleLapkin added 4 commits April 25, 2023 15:34

Add ty::TraitRef::{new, from_lang_item}

14f8327

Move TraitRef constructors to the top

2d8c905

In rust `new`-ish functions are usually the first ones in an `impl` block

Replace tcx.mk_trait_ref with ty::TraitRef::new

46b01ab

Remove tcx.mk_trait_ref

8f7fe4a

rustbot assigned lcnr Apr 25, 2023

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver) labels Apr 25, 2023

WaffleLapkin commented Apr 25, 2023

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compiler/rustc_hir_analysis/src/bounds.rs Outdated Show resolved Hide resolved

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WaffleLapkin added 2 commits April 25, 2023 16:31

Use ty::TraitRef::new in rustdoc

f0dd95c

Use ty::TraitRef::new in clippy

91d495f

Noratrieb reviewed Apr 25, 2023

View reviewed changes

Remove some useless ty::Binder::dummy calls

c727edc

rust-cloud-vms bot force-pushed the unmkI branch from d4e2cf7 to c727edc Compare April 25, 2023 16:47

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lcnr reviewed Apr 25, 2023

View reviewed changes

Rename `TraitRef::{_use_mk_trait_ref_instead => _use_trait_ref_new_in…

d9f842a

…stead}`

rustbot 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 Apr 25, 2023

WaffleLapkin added 4 commits April 26, 2023 10:38

Remove some more useless ty::Binder::dummy calls

071f737

Switch ty::TraitRef::from_lang_item from using TyCtxtAt to `TyCtx…

4f2532f

…t` and a `Span`

Add new ToPredicate impls and TraitRef methods to remove some `ty…

1b8c778

…::Binber::dummy` calls

Don't return a Binder from TraitRef::identity

39b95c9

rustbot removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Apr 26, 2023

rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Apr 26, 2023

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jackh726 reviewed Apr 26, 2023

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Fix uses of TraitRef::identity in clippy and rustdoc

689721d

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 3, 2023

bors added the merged-by-bors This PR was explicitly merged by bors. label May 4, 2023

bors merged commit 6f8c055 into rust-lang:master May 4, 2023

rustbot added this to the 1.71.0 milestone May 4, 2023

This was referenced May 4, 2023

Introduce AliasKind::Inherent for inherent associated types #109410

Merged

Deal with unnormalized projections when structurally resolving types with new solver #110204

Merged

flip1995 pushed a commit to flip1995/rust that referenced this pull request May 5, 2023

Auto merge of rust-lang#110806 - WaffleLapkin:unmkI, r=lcnr

8518391

Replace `tcx.mk_trait_ref` with `TraitRef::new` First step in implementing rust-lang/compiler-team#616 r? `@lcnr`

celinval mentioned this pull request Jun 21, 2023

Upgrade rust toolchain to nightly-2023-06-20 model-checking/kani#2551

Merged

4 tasks

WaffleLapkin deleted the unmkI branch June 1, 2025 13:21

Replace tcx.mk_trait_ref with TraitRef::new #110806

Replace tcx.mk_trait_ref with TraitRef::new #110806

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Overall result: no relevant changes - no action needed

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Replace `tcx.mk_trait_ref` with `TraitRef::new` #110806

Replace `tcx.mk_trait_ref` with `TraitRef::new` #110806