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merge DefKind::InlineConst into AnonConst #158767

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2 changes: 1 addition & 1 deletion compiler/rustc_ast_lowering/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2916,7 +2916,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
// Do not use lower_anon_const_to_const_arg, as that attempts to represent the body
// directly. Instead, force an anon const.
let def_id = self.local_def_id(anon_const.id);
assert_eq!(DefKind::InlineConst, self.tcx.def_kind(def_id));
assert_eq!(DefKind::AnonConst, self.tcx.def_kind(def_id));
let lowered_anon = self.lower_anon_const_to_anon_const(anon_const, span);
ConstArg {
hir_id: self.lower_node_id(node_id),
Expand Down
10 changes: 8 additions & 2 deletions compiler/rustc_borrowck/src/type_check/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1709,7 +1709,9 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
if uv.promoted.is_none() {
let tcx = self.tcx();
let def_id = uv.def;
if tcx.def_kind(def_id) == DefKind::InlineConst {
if tcx.def_kind(def_id) == DefKind::AnonConst
&& tcx.anon_const_kind(def_id) == ty::AnonConstKind::NonTypeSystemInline
{
let def_id = def_id.expect_local();
let predicates = self.prove_closure_bounds(tcx, def_id, uv.args, location);
self.normalize_and_prove_instantiated_predicates(
Expand Down Expand Up @@ -2653,7 +2655,11 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
// length as the `typeck_root_args`.
&args[..typeck_root_args.len()]
}
DefKind::InlineConst => args.as_inline_const().parent_args(),
DefKind::AnonConst
if tcx.anon_const_kind(def_id) == ty::AnonConstKind::NonTypeSystemInline =>
{
args.as_inline_const().parent_args()
}
other => bug!("unexpected item {:?}", other),
};
let parent_args = tcx.mk_args(parent_args);
Expand Down
5 changes: 4 additions & 1 deletion compiler/rustc_borrowck/src/universal_regions.rs
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Expand Up @@ -615,7 +615,10 @@ impl<'cx, 'tcx> UniversalRegionsBuilder<'cx, 'tcx> {

BodyOwnerKind::Const { .. } | BodyOwnerKind::Static(..) => {
match tcx.def_kind(self.mir_def) {
DefKind::InlineConst if !tcx.is_type_system_inline_const(self.mir_def) => {
DefKind::AnonConst
if tcx.anon_const_kind(self.mir_def)
== ty::AnonConstKind::NonTypeSystemInline =>
{
// This is required for `AscribeUserType` canonical query, which will call
// `type_of(inline_const_def_id)`. That `type_of` would inject erased lifetimes
// into borrowck, which is ICE #78174.
Expand Down
1 change: 0 additions & 1 deletion compiler/rustc_const_eval/src/const_eval/eval_queries.rs
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Expand Up @@ -64,7 +64,6 @@ fn setup_for_eval<'tcx>(
| DefKind::Static { .. }
| DefKind::ConstParam
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::AssocConst { .. }
),
"Unexpected DefKind: {:?}",
Expand Down
11 changes: 2 additions & 9 deletions compiler/rustc_hir/src/def.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -165,7 +165,8 @@ pub enum DefKind {
Use,
/// An `extern` block.
ForeignMod,
/// Anonymous constant, e.g. the `1 + 2` in `[u8; 1 + 2]`.
/// Anonymous constant, e.g. the `1 + 2` in `[u8; 1 + 2]` or `enum E { A = 1 + 2 }`, or an
/// inline constant, e.g. `const { 1 + 2 }`.
///
/// Not all anon-consts are actually still relevant in the HIR. We lower
/// trivial const-arguments directly to `hir::ConstArgKind::Path`, at which
Expand All @@ -176,8 +177,6 @@ pub enum DefKind {
/// constants should only be reachable by iterating all definitions of a
/// given crate, you should not have to worry about this.
AnonConst,
/// An inline constant, e.g. `const { 1 + 2 }`
InlineConst,
/// Opaque type, aka `impl Trait`.
OpaqueTy,
/// A field in a struct, enum or union. e.g.
Expand Down Expand Up @@ -239,7 +238,6 @@ impl DefKind {
DefKind::Use => "import",
DefKind::ForeignMod => "foreign module",
DefKind::AnonConst => "constant expression",
DefKind::InlineConst => "inline constant",
DefKind::Field => "field",
DefKind::Impl { .. } => "implementation",
DefKind::Closure => "closure",
Expand All @@ -263,7 +261,6 @@ impl DefKind {
| DefKind::OpaqueTy
| DefKind::Impl { .. }
| DefKind::Use
| DefKind::InlineConst
| DefKind::ExternCrate => "an",
DefKind::Macro(kinds) => kinds.article(),
_ => "a",
Expand Down Expand Up @@ -296,7 +293,6 @@ impl DefKind {

// Not namespaced.
DefKind::AnonConst
| DefKind::InlineConst
| DefKind::Field
| DefKind::LifetimeParam
| DefKind::ExternCrate
Expand Down Expand Up @@ -343,7 +339,6 @@ impl DefKind {
DefKind::Use => DefPathData::Use,
DefKind::ForeignMod => DefPathData::ForeignMod,
DefKind::AnonConst => DefPathData::AnonConst,
DefKind::InlineConst => DefPathData::AnonConst,
DefKind::OpaqueTy => DefPathData::OpaqueTy,
DefKind::GlobalAsm => DefPathData::GlobalAsm,
DefKind::Impl { .. } => DefPathData::Impl,
Expand Down Expand Up @@ -390,7 +385,6 @@ impl DefKind {
| DefKind::Fn
| DefKind::ForeignTy
| DefKind::Impl { .. }
| DefKind::InlineConst
| DefKind::OpaqueTy
| DefKind::Static { .. }
| DefKind::Struct
Expand Down Expand Up @@ -443,7 +437,6 @@ impl DefKind {
| DefKind::ConstParam
| DefKind::LifetimeParam
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::GlobalAsm
| DefKind::ExternCrate => false,
}
Expand Down
1 change: 0 additions & 1 deletion compiler/rustc_hir_analysis/src/check/check.rs
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Expand Up @@ -1171,7 +1171,6 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(),

// These have no wf checks
DefKind::AnonConst
| DefKind::InlineConst
| DefKind::ExternCrate
| DefKind::Macro(..)
| DefKind::Use
Expand Down
1 change: 0 additions & 1 deletion compiler/rustc_hir_analysis/src/check/wfcheck.rs
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Expand Up @@ -2406,7 +2406,6 @@ fn lint_redundant_lifetimes<'tcx>(
| DefKind::Use
| DefKind::ForeignMod
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::OpaqueTy
| DefKind::Field
| DefKind::LifetimeParam
Expand Down
17 changes: 10 additions & 7 deletions compiler/rustc_hir_analysis/src/collect.rs
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Expand Up @@ -1635,29 +1635,32 @@ fn const_param_default<'tcx>(
}

fn anon_const_kind<'tcx>(tcx: TyCtxt<'tcx>, def: LocalDefId) -> ty::AnonConstKind {
debug_assert_matches!(tcx.def_kind(def), DefKind::AnonConst | DefKind::InlineConst);
debug_assert_matches!(tcx.def_kind(def), DefKind::AnonConst);
let hir_id = tcx.local_def_id_to_hir_id(def);
let const_arg_id = tcx.parent_hir_id(hir_id);
match tcx.hir_node(const_arg_id) {
let parent_node_id = tcx.parent_hir_id(hir_id);
match tcx.hir_node(parent_node_id) {
hir::Node::ConstArg(const_arg) => {
debug_assert_matches!(const_arg.kind, hir::ConstArgKind::Anon(hir::AnonConst { def_id, .. }) if *def_id == def);
let parent_hir_node = tcx.hir_node(tcx.parent_hir_id(const_arg_id));
if tcx.features().generic_const_exprs() {
ty::AnonConstKind::GCE
} else if tcx.features().min_generic_const_args() {
ty::AnonConstKind::MCG
} else if let hir::Node::Expr(hir::Expr {
kind: hir::ExprKind::Repeat(_, repeat_count),
..
}) = parent_hir_node
&& repeat_count.hir_id == const_arg_id
}) = tcx.parent_hir_node(parent_node_id)
&& repeat_count.hir_id == parent_node_id
{
ty::AnonConstKind::RepeatExprCount
} else {
ty::AnonConstKind::MCG
}
}
_ => ty::AnonConstKind::NonTypeSystem,
hir::Node::Expr(hir::Expr {
kind: hir::ExprKind::ConstBlock(..) | hir::ExprKind::InlineAsm(..),
..
}) => ty::AnonConstKind::NonTypeSystemInline,
_ => ty::AnonConstKind::NonTypeSystemAnon,

@khyperia khyperia Jul 4, 2026 •
edited by rustbot
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I am unsure about this catch-all, tbh. There's three options I see:

  • leave it as a catch-all
  • explicitly list which parents are allowed to have an AnonConst child, panic if there's an unexpected parent
    • afaik it's just Node::Field and Node::Variant
  • add variants to AnonConstKind that actually list which specific kind of anon const this non-type-system anon const is - for example, having the AnonConstKind variants of ConstBlock, AsmConstBlock, FieldAnonConst, VariantAnonConst, and then perhaps a fn AnonConstKind::is_type_system() -> bool or somethin'
    • there's a few callers that we match on the hir parent again to figure out which type of non-type-system anon const it is, so just returning it here seems useful

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@BoxyUwU BoxyUwU Jul 7, 2026

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it might make sense to make this NonTypeSystem(NonTypeSystemAnonConstKind) (better name pending) 🤔 unsure :3 I like the option of specifying which kind of anon const it is if that makes a lot of callers simpler (and it's weird to only do it for inline vs non inline lol)

@khyperia khyperia Jul 10, 2026

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context for others: boxy and I discussed this in DMs quite a bit, the conclusion was that this PR exposes a lot of questionable jank, and we may want to do larger refactorings in this area. However, that's out of scope for this PR, so leaving this as a catch-all for now is fine.

}
}

Expand Down
8 changes: 6 additions & 2 deletions compiler/rustc_hir_analysis/src/collect/generics_of.rs
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Expand Up @@ -162,13 +162,17 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
ty::AnonConstKind::GCE => Some(parent_did),

// Field defaults are allowed to use generic parameters, e.g. `field: u32 = /*defid: N + 1*/`
ty::AnonConstKind::NonTypeSystem
ty::AnonConstKind::NonTypeSystemAnon
if matches!(tcx.parent_hir_node(hir_id), Node::TyPat(_) | Node::Field(_)) =>

@khyperia khyperia Jul 4, 2026 •
edited by rustbot
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Node::TyPat(_) appears to be dead code here - or at the very least, it's untested, replacing it with a panic and ./x test tests/ui does not fire. Was added in #136284 and code has been heavily refactored since then - haven't fully investigated yet.

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@BoxyUwU BoxyUwU Jul 7, 2026

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hmm yeah I wouldn't expect pattern types to contain non type system anon consts? that feels weird :3

{
Some(parent_did)
}
// Default to no generic parameters for other kinds of anon consts
ty::AnonConstKind::NonTypeSystem => None,
ty::AnonConstKind::NonTypeSystemAnon => None,
ty::AnonConstKind::NonTypeSystemInline => span_bug!(
tcx.def_span(def_id),
"a DefKind::AnonConst with a HIR parent of hir::Node::AnonConst should never be an AnonConstKind::NonTypeSystemInline"
),
}
}
Node::ConstBlock(_)
Expand Down
1 change: 0 additions & 1 deletion compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
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Expand Up @@ -1956,7 +1956,6 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
| DefKind::ForeignTy
| DefKind::GlobalAsm
| DefKind::Impl { .. }
| DefKind::InlineConst
| DefKind::LifetimeParam
| DefKind::Macro(_)
| DefKind::Mod
Expand Down
19 changes: 9 additions & 10 deletions compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
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Expand Up @@ -509,22 +509,20 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
/// contains params). Those cases are handled by `check_param_uses_if_mcg`.
fn anon_const_forbids_generic_params(&self) -> Option<ForbidParamContext> {
let tcx = self.tcx();
let parent_def_id = self.item_def_id();
let item_def_id = self.item_def_id();

// Inline consts and closures can be nested inside anon consts that forbid generic
// params (e.g. an enum discriminant). Walk up the def parent chain to find the
// nearest enclosing AnonConst and use that to determine the context.
let parent_def_id = tcx.typeck_root_def_id(parent_def_id.into());
let anon_const_def_id = tcx.typeck_root_def_id_local(item_def_id);

let anon_const_def_id = match tcx.def_kind(parent_def_id) {
DefKind::AnonConst => parent_def_id,
DefKind::InlineConst if tcx.is_type_system_inline_const(parent_def_id) => parent_def_id,
_ => return None,
};
if tcx.def_kind(anon_const_def_id) != DefKind::AnonConst {
return None;
}

match tcx.anon_const_kind(anon_const_def_id) {
ty::AnonConstKind::MCG => Some(ForbidParamContext::ConstArgument),
ty::AnonConstKind::NonTypeSystem => {
ty::AnonConstKind::NonTypeSystemAnon => {
// NonTypeSystem anon consts only have accessible generic parameters in specific
// positions (ty patterns and field defaults — see `generics_of`). In all other
// positions (e.g. enum discriminants) generic parameters are not in scope.
Expand All @@ -534,7 +532,9 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
None
}
}
ty::AnonConstKind::GCE | ty::AnonConstKind::RepeatExprCount => None,
ty::AnonConstKind::NonTypeSystemInline
| ty::AnonConstKind::GCE
| ty::AnonConstKind::RepeatExprCount => None,
}
}

Expand Down Expand Up @@ -2975,7 +2975,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
| DefKind::Use
| DefKind::ForeignMod
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::Field
| DefKind::Impl { .. }
| DefKind::Closure
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_hir_analysis/src/lib.rs
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Expand Up @@ -191,7 +191,7 @@ pub fn check_crate(tcx: TyCtxt<'_>) {
// `feed_anon_const_type`.
// Also skip items for which typeck forwards to parent typeck.
if !(def_kind == DefKind::AnonConst
|| def_kind == DefKind::InlineConst && tcx.is_type_system_inline_const(item_def_id)
&& tcx.anon_const_kind(item_def_id) != ty::AnonConstKind::NonTypeSystemInline

@BoxyUwU BoxyUwU Jul 7, 2026 •
edited by rustbot
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this now allows feeding type_of for NonTypeSystemAnon I guess? I think that's unintentional?

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@khyperia khyperia Jul 7, 2026

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It was previously allowed! This is one of the cases where my eyebrows were raised:

Indeed, the places where we distinguish between the two raised my eyebrows a few times when doing this PR, and being a little more explicit and loud about it is helpful for code clarity, IMO.

With this PR, before this PR, as well as before #158375 we blindly accepted all DefKind::AnonConsts here, including non type system ones. I tried to keep the existing behavior as close as possible, with the intent of making wonky behavior more apparent. If you think the behavior should change, I'll look into it!

@BoxyUwU BoxyUwU Jul 7, 2026

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oh that's quite fun, I would expect we never feed non type system anon consts lol. cc @oli-obk

fine to keep behaviour the same for this PR

|| tcx.is_typeck_child(item_def_id.to_def_id()))
{
tcx.ensure_ok().typeck(item_def_id);
Expand Down
5 changes: 0 additions & 5 deletions compiler/rustc_hir_typeck/src/loops.rs
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Expand Up @@ -84,11 +84,6 @@ pub(crate) fn check<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId, body: &'tcx hir
CheckLoopVisitor { tcx, cx_stack: vec![Normal], block_breaks: Default::default() };
let cx = match tcx.def_kind(def_id) {
DefKind::AnonConst => AnonConst,
DefKind::InlineConst => {
// only type system inline consts are typeck roots
debug_assert!(tcx.is_type_system_inline_const(def_id));
ConstBlock
}
_ => Fn,
};
check.with_context(cx, |v| v.visit_body(body));
Expand Down
22 changes: 3 additions & 19 deletions compiler/rustc_metadata/src/rmeta/encoder.rs
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Expand Up @@ -916,7 +916,6 @@ fn should_encode_span(def_kind: DefKind) -> bool {
| DefKind::ExternCrate
| DefKind::Use
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::OpaqueTy
| DefKind::Field
| DefKind::Impl { .. }
Expand Down Expand Up @@ -962,7 +961,6 @@ fn should_encode_attrs(def_kind: DefKind) -> bool {
| DefKind::ExternCrate
| DefKind::ForeignMod
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::OpaqueTy
| DefKind::LifetimeParam
| DefKind::Static { nested: true, .. }
Expand Down Expand Up @@ -996,7 +994,6 @@ fn should_encode_expn_that_defined(def_kind: DefKind) -> bool {
| DefKind::Use
| DefKind::ForeignMod
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::OpaqueTy
| DefKind::Field
| DefKind::LifetimeParam
Expand Down Expand Up @@ -1032,7 +1029,6 @@ fn should_encode_visibility(def_kind: DefKind) -> bool {
| DefKind::ConstParam
| DefKind::LifetimeParam
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::Static { nested: true, .. }
| DefKind::OpaqueTy
| DefKind::GlobalAsm
Expand Down Expand Up @@ -1071,7 +1067,6 @@ fn should_encode_stability(def_kind: DefKind) -> bool {
DefKind::Use
| DefKind::LifetimeParam
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::GlobalAsm
| DefKind::Closure
| DefKind::ExternCrate
Expand Down Expand Up @@ -1108,10 +1103,7 @@ fn should_encode_mir(
// instance_mir uses mir_for_ctfe rather than optimized_mir for constructors
DefKind::Ctor(_, _) => (true, false),
// Constants
DefKind::AnonConst
| DefKind::InlineConst
| DefKind::AssocConst { .. }
| DefKind::Const { .. } => (true, false),
DefKind::AnonConst | DefKind::AssocConst { .. } | DefKind::Const { .. } => (true, false),
// Coroutines require optimized MIR to compute layout.
DefKind::Closure if tcx.is_coroutine(def_id.to_def_id()) => (false, true),
DefKind::SyntheticCoroutineBody => (false, true),
Expand Down Expand Up @@ -1165,7 +1157,6 @@ fn should_encode_variances<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId, def_kind: Def
| DefKind::Use
| DefKind::LifetimeParam
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::GlobalAsm
| DefKind::Closure
| DefKind::ExternCrate
Expand All @@ -1191,7 +1182,6 @@ fn should_encode_generics(def_kind: DefKind) -> bool {
| DefKind::AssocFn
| DefKind::AssocConst { .. }
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::OpaqueTy
| DefKind::Impl { .. }
| DefKind::Field
Expand Down Expand Up @@ -1228,7 +1218,6 @@ fn should_encode_type(tcx: TyCtxt<'_>, def_id: LocalDefId, def_kind: DefKind) ->
| DefKind::Closure
| DefKind::ConstParam
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::SyntheticCoroutineBody => true,

DefKind::OpaqueTy => {
Expand Down Expand Up @@ -1290,7 +1279,6 @@ fn should_encode_fn_sig(def_kind: DefKind) -> bool {
| DefKind::Closure
| DefKind::ConstParam
| DefKind::AnonConst
| DefKind::InlineConst
| DefKind::AssocTy
| DefKind::TyParam
| DefKind::Trait
Expand Down Expand Up @@ -1327,7 +1315,6 @@ fn should_encode_constness(def_kind: DefKind) -> bool {
| DefKind::Impl { .. }
| DefKind::ForeignTy
| DefKind::ConstParam
| DefKind::InlineConst
| DefKind::AssocTy
| DefKind::TyParam
| DefKind::Trait
Expand All @@ -1348,10 +1335,7 @@ fn should_encode_constness(def_kind: DefKind) -> bool {
fn should_encode_const(def_kind: DefKind) -> bool {
match def_kind {
// FIXME(mgca): should we remove Const and AssocConst here?
DefKind::Const { .. }
| DefKind::AssocConst { .. }
| DefKind::AnonConst
| DefKind::InlineConst => true,
DefKind::Const { .. } | DefKind::AssocConst { .. } | DefKind::AnonConst => true,

DefKind::Struct
| DefKind::Union
Expand Down Expand Up @@ -1624,7 +1608,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
ty::AssocContainer::TraitImpl(_) => {}
}
}
if let DefKind::AnonConst | DefKind::InlineConst = def_kind {
if let DefKind::AnonConst = def_kind {
record!(self.tables.anon_const_kind[def_id] <- self.tcx.anon_const_kind(def_id));
}
if should_encode_const_of_item(self.tcx, def_id, def_kind) {
Expand Down
1 change: 0 additions & 1 deletion compiler/rustc_metadata/src/rmeta/table.rs
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Expand Up @@ -175,7 +175,6 @@ fixed_size_enum! {
( Use )
( ForeignMod )
( AnonConst )
( InlineConst )
( OpaqueTy )
( Field )
( LifetimeParam )
Expand Down
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