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bors 72b21e1a64 Auto merge of #139558 - camelid:mgca-const-items, r=oli-obk,BoxyUwU 
mgca: Add ConstArg representation for const items

tracking issue: rust-lang/rust#132980
fixes rust-lang/rust#131046
fixes rust-lang/rust#134641

As part of implementing `min_generic_const_args`, we need to distinguish const items that can be used in the type system, such as in associated const equality projections, from const items containing arbitrary const code, which must be kept out of the type system. Specifically, all "type consts" must be either concrete (no generics) or generic with a trivial expression like `N` or a path to another type const item.

To syntactically distinguish these cases, we require, for now at least, that users annotate all type consts with the `#[type_const]` attribute. Then, we validate that the const's right-hand side is indeed eligible to be a type const and represent it differently in the HIR.

We accomplish this representation using a new `ConstItemRhs` enum in the HIR, and a similar but simpler enum in the AST. When `#[type_const]` is **not** applied to a const (e.g. on stable), we represent const item right-hand sides (rhs's) as HIR bodies, like before. However, when the attribute is applied, we instead lower to a `hir::ConstArg`. This syntactically distinguishes between trivial const args (paths) and arbitrary expressions, which are represented using `AnonConst`s. Then in `generics_of`, we can take advantage of the existing machinery to bar the `AnonConst` rhs's from using parent generics.
2025-11-08 22:31:33 +00:00
..
auxiliary Failing test 2024-06-07 14:59:38 -04:00
coherence When more than a single impl and less than 4 could apply, point at them 2025-10-31 20:44:01 +00:00
ctfe [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
defaultimpl Tweak trait modifier errors 2025-08-11 16:58:21 -05:00
fuzzed adjust derive_error 2025-02-13 23:49:09 +01:00
min_specialization Unconditionally run check_item_type on all items 2025-06-30 08:06:08 +00:00
soundness [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
anyid-repro-125197.rs Only compute specializes query if specialization is enabled in the crate of the specialized impl 2024-06-07 15:58:50 -04:00
assoc-ty-graph-cycle.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
assoc-ty-graph-cycle.stderr
broken-mir-drop-glue-107228.rs add test for #107228 2024-03-23 13:05:22 +01:00
const_trait_impl.rs Make Default const and add some const Default impls 2025-07-07 22:09:37 +00:00
const_trait_impl.stderr parse const trait Trait 2025-07-17 18:06:26 +08:00
cross-crate-defaults.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
cross-crate-defaults.stderr
default-associated-type-bound-1.rs
default-associated-type-bound-1.stderr When more than a single impl and less than 4 could apply, point at them 2025-10-31 20:44:01 +00:00
default-associated-type-bound-2.rs
default-associated-type-bound-2.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
default-generic-associated-type-bound.rs
default-generic-associated-type-bound.stderr Mention type parameter in more cases and don't suggest ~const bound already there 2024-12-07 21:37:13 +00:00
default-proj-ty-as-type-of-const-issue-125757.rs Re-enable ConstArgKind::Path lowering by default 2024-09-12 13:56:01 -04:00
default-proj-ty-as-type-of-const-issue-125757.stderr fix(hir_analysis/wfcheck): don't leak {type error} 2024-09-29 23:40:43 -05:00
dont-drop-upcast-candidate.rs Don't drop Upcast candidate in intercrate mode 2024-05-30 19:45:59 -04:00
dont-drop-upcast-candidate.stderr Don't drop Upcast candidate in intercrate mode 2024-05-30 19:45:59 -04:00
issue-33017.rs
issue-33017.stderr Use trait name instead of full constraint in suggestion message 2024-12-07 21:29:58 +00:00
issue-35376.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-35376.stderr
issue-36804.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-36804.stderr
issue-38091-2.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-38091-2.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-38091.rs
issue-38091.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-39448.rs Always make inductive cycles as ambig during typeck 2024-03-31 20:44:30 -04:00
issue-39448.stderr Always make inductive cycles as ambig during typeck 2024-03-31 20:44:30 -04:00
issue-39618.rs Always make inductive cycles as ambig during typeck 2024-03-31 20:44:30 -04:00
issue-39618.stderr Always make inductive cycles as ambig during typeck 2024-03-31 20:44:30 -04:00
issue-40582.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-43037.current.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-43037.negative.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-43037.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-44861.rs UI tests: Rename "object safe" to "dyn compatible" 2024-10-10 01:13:29 +02:00
issue-44861.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-45814.current.stderr Do not assemble candidates for default impls 2024-02-13 19:20:13 +00:00
issue-45814.negative.stderr Do not assemble candidates for default impls 2024-02-13 19:20:13 +00:00
issue-45814.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-50452-fail.rs
issue-50452-fail.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-50452.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-50452.stderr
issue-51892.rs
issue-51892.stderr Avoid looking at HIR for trait and impl items 2025-06-30 08:45:43 +00:00
issue-52050.rs
issue-52050.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-59435.rs
issue-59435.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
issue-63716-parse-async.rs Use cfg(false) in UI tests 2025-04-03 21:41:58 +00:00
issue-63716-parse-async.stderr
issue-68830-spurious-diagnostics.rs Stop being so bail-y in candidate assembly 2024-11-21 01:35:34 +00:00
issue-68830-spurious-diagnostics.stderr Stop being so bail-y in candidate assembly 2024-11-21 01:35:34 +00:00
issue-70442.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
issue-70442.stderr
issue-111232.rs constify From and Into 2025-07-11 08:30:47 +00:00
issue-111232.stderr constify From and Into 2025-07-11 08:30:47 +00:00
non-defaulted-item-fail.rs
non-defaulted-item-fail.stderr
overlap-due-to-unsatisfied-const-bound.rs fix associated_const_equality tests 2025-11-08 13:50:48 -05:00
overlap-due-to-unsatisfied-const-bound.stderr fix associated_const_equality tests 2025-11-08 13:50:48 -05:00
prefer-specializing-impl-over-default.current.stderr handle specialization in the new trait solver 2025-04-25 17:59:33 +00:00
prefer-specializing-impl-over-default.next.stderr handle specialization in the new trait solver 2025-04-25 17:59:33 +00:00
prefer-specializing-impl-over-default.rs handle specialization in the new trait solver 2025-04-25 17:59:33 +00:00
README-rpass.md
README.md
source-impl-requires-constraining-predicates-ambig.next.stderr Stop using translate_args in the new solver 2024-05-31 09:42:30 -04:00
source-impl-requires-constraining-predicates-ambig.rs NFC add known bug nr to test 2024-11-02 13:33:39 +01:00
source-impl-requires-constraining-predicates.current.stderr Stop using translate_args in the new solver 2024-05-31 09:42:30 -04:00
source-impl-requires-constraining-predicates.next.stderr Stop using translate_args in the new solver 2024-05-31 09:42:30 -04:00
source-impl-requires-constraining-predicates.rs Stop using translate_args in the new solver 2024-05-31 09:42:30 -04:00
specialization-allowed-cross-crate.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-allowed-cross-crate.stderr
specialization-assoc-fns.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-assoc-fns.stderr
specialization-basics.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-basics.stderr
specialization-cross-crate-no-gate.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-cross-crate.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-cross-crate.stderr
specialization-default-items-drop-coherence.current.stderr stabilize -Znext-solver=coherence 2024-10-15 13:11:00 +02:00
specialization-default-items-drop-coherence.next.stderr stabilize -Znext-solver=coherence 2024-10-15 13:11:00 +02:00
specialization-default-items-drop-coherence.rs stabilize -Znext-solver=coherence 2024-10-15 13:11:00 +02:00
specialization-default-methods.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-default-methods.stderr
specialization-default-projection.current.stderr handle specialization in the new trait solver 2025-04-25 17:59:33 +00:00
specialization-default-projection.next.stderr handle specialization in the new trait solver 2025-04-25 17:59:33 +00:00
specialization-default-projection.rs handle specialization in the new trait solver 2025-04-25 17:59:33 +00:00
specialization-default-types.current.stderr Remove hir::AssocItemKind. 2025-07-13 13:50:00 +00:00
specialization-default-types.next.stderr Remove hir::AssocItemKind. 2025-07-13 13:50:00 +00:00
specialization-default-types.rs handle specialization in the new trait solver 2025-04-25 17:59:33 +00:00
specialization-feature-gate-default.rs
specialization-feature-gate-default.stderr Bless tests 2024-01-13 12:46:58 -05:00
specialization-feature-gate-overlap.rs
specialization-feature-gate-overlap.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
specialization-no-default.rs
specialization-no-default.stderr
specialization-on-projection.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-on-projection.stderr
specialization-out-of-order.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-out-of-order.stderr
specialization-overlap-hygiene.rs
specialization-overlap-hygiene.stderr Show number in error message even for one error 2023-11-24 19:15:52 +01:00
specialization-overlap-negative.rs Ensure that negative auto impls are always applicable 2025-03-04 17:45:18 +00:00
specialization-overlap-negative.stderr Ensure that negative auto impls are always applicable 2025-03-04 17:45:18 +00:00
specialization-overlap-projection.rs stabilize -Znext-solver=coherence 2024-10-15 13:11:00 +02:00
specialization-overlap-projection.stderr stabilize -Znext-solver=coherence 2024-10-15 13:11:00 +02:00
specialization-overlap.rs
specialization-overlap.stderr
specialization-polarity.rs
specialization-polarity.stderr
specialization-projection-alias.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-projection-alias.stderr
specialization-projection.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-projection.stderr
specialization-supertraits.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-supertraits.stderr
specialization-translate-projections-with-lifetimes.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-translate-projections-with-lifetimes.stderr
specialization-translate-projections-with-params.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-translate-projections-with-params.stderr
specialization-translate-projections.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
specialization-translate-projections.stderr
trait-specialization-default-methods-55380.rs Add test batch 2 2025-08-27 15:06:05 -04:00
trait-specialization-default-methods-55380.stderr Add test batch 2 2025-08-27 15:06:05 -04:00
transmute-specialization.rs [AUTO-GENERATED] Migrate ui tests from // to //@ directives 2024-02-16 20:02:50 +00:00
transmute-specialization.stderr

README.md

This directory contains the test for incorrect usage of specialization that should lead to compile failure. Those tests break down into a few categories: