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Auto merge of rust-lang#141015 - davidtwco:perf-sized-hierarchy-1, r=<try>
[PERF] Sized Hierarchy: Attempt 1 A perf run reverting changes to the unelaborated sizedness optimisation on rust-lang#137944 to determine if it caused the regression post-review feedback. r? `@ghost`
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‎compiler/rustc_codegen_cranelift/example/mini_core.rs‎

Lines changed: 36 additions & 30 deletions
Original file line numberDiff line numberDiff line change
@@ -14,8 +14,14 @@
1414
#![no_core]
1515
#![allow(dead_code, internal_features, ambiguous_wide_pointer_comparisons)]
1616

17+
#[lang = "pointee_sized"]
18+
pub trait PointeeSized {}
19+
20+
#[lang = "meta_sized"]
21+
pub trait MetaSized: PointeeSized {}
22+
1723
#[lang = "sized"]
18-
pub trait Sized {}
24+
pub trait Sized: MetaSized {}
1925

2026
#[lang = "destruct"]
2127
pub trait Destruct {}
@@ -24,35 +30,35 @@ pub trait Destruct {}
2430
pub trait Tuple {}
2531

2632
#[lang = "unsize"]
27-
pub trait Unsize<T: ?Sized> {}
33+
pub trait Unsize<T: PointeeSized>: PointeeSized {}
2834

2935
#[lang = "coerce_unsized"]
3036
pub trait CoerceUnsized<T> {}
3137

32-
impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
33-
impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a mut U> for &'a mut T {}
34-
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*const U> for *const T {}
35-
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
38+
impl<'a, 'b: 'a, T: PointeeSized + Unsize<U>, U: PointeeSized> CoerceUnsized<&'a U> for &'b T {}
39+
impl<'a, T: PointeeSized + Unsize<U>, U: PointeeSized> CoerceUnsized<&'a mut U> for &'a mut T {}
40+
impl<T: PointeeSized + Unsize<U>, U: PointeeSized> CoerceUnsized<*const U> for *const T {}
41+
impl<T: PointeeSized + Unsize<U>, U: PointeeSized> CoerceUnsized<*mut U> for *mut T {}
3642

3743
#[lang = "dispatch_from_dyn"]
3844
pub trait DispatchFromDyn<T> {}
3945

4046
// &T -> &U
41-
impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<&'a U> for &'a T {}
47+
impl<'a, T: PointeeSized + Unsize<U>, U: PointeeSized> DispatchFromDyn<&'a U> for &'a T {}
4248
// &mut T -> &mut U
43-
impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<&'a mut U> for &'a mut T {}
49+
impl<'a, T: PointeeSized + Unsize<U>, U: PointeeSized> DispatchFromDyn<&'a mut U> for &'a mut T {}
4450
// *const T -> *const U
45-
impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<*const U> for *const T {}
51+
impl<T: PointeeSized + Unsize<U>, U: PointeeSized> DispatchFromDyn<*const U> for *const T {}
4652
// *mut T -> *mut U
47-
impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<*mut U> for *mut T {}
48-
impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Box<U>> for Box<T> {}
53+
impl<T: PointeeSized + Unsize<U>, U: PointeeSized> DispatchFromDyn<*mut U> for *mut T {}
54+
impl<T: MetaSized + Unsize<U>, U: MetaSized> DispatchFromDyn<Box<U>> for Box<T> {}
4955

5056
#[lang = "legacy_receiver"]
5157
pub trait LegacyReceiver {}
5258

53-
impl<T: ?Sized> LegacyReceiver for &T {}
54-
impl<T: ?Sized> LegacyReceiver for &mut T {}
55-
impl<T: ?Sized> LegacyReceiver for Box<T> {}
59+
impl<T: PointeeSized> LegacyReceiver for &T {}
60+
impl<T: PointeeSized> LegacyReceiver for &mut T {}
61+
impl<T: MetaSized> LegacyReceiver for Box<T> {}
5662

5763
#[lang = "copy"]
5864
pub trait Copy {}
@@ -74,9 +80,9 @@ impl Copy for isize {}
7480
impl Copy for f32 {}
7581
impl Copy for f64 {}
7682
impl Copy for char {}
77-
impl<'a, T: ?Sized> Copy for &'a T {}
78-
impl<T: ?Sized> Copy for *const T {}
79-
impl<T: ?Sized> Copy for *mut T {}
83+
impl<'a, T: PointeeSized> Copy for &'a T {}
84+
impl<T: PointeeSized> Copy for *const T {}
85+
impl<T: PointeeSized> Copy for *mut T {}
8086
impl<T: Copy> Copy for Option<T> {}
8187

8288
#[lang = "sync"]
@@ -94,17 +100,17 @@ unsafe impl Sync for i32 {}
94100
unsafe impl Sync for isize {}
95101
unsafe impl Sync for char {}
96102
unsafe impl Sync for f32 {}
97-
unsafe impl<'a, T: ?Sized> Sync for &'a T {}
103+
unsafe impl<'a, T: PointeeSized> Sync for &'a T {}
98104
unsafe impl<T: Sync, const N: usize> Sync for [T; N] {}
99105

100106
#[lang = "freeze"]
101107
unsafe auto trait Freeze {}
102108

103-
unsafe impl<T: ?Sized> Freeze for PhantomData<T> {}
104-
unsafe impl<T: ?Sized> Freeze for *const T {}
105-
unsafe impl<T: ?Sized> Freeze for *mut T {}
106-
unsafe impl<T: ?Sized> Freeze for &T {}
107-
unsafe impl<T: ?Sized> Freeze for &mut T {}
109+
unsafe impl<T: PointeeSized> Freeze for PhantomData<T> {}
110+
unsafe impl<T: PointeeSized> Freeze for *const T {}
111+
unsafe impl<T: PointeeSized> Freeze for *mut T {}
112+
unsafe impl<T: PointeeSized> Freeze for &T {}
113+
unsafe impl<T: PointeeSized> Freeze for &mut T {}
108114

109115
#[lang = "structural_peq"]
110116
pub trait StructuralPartialEq {}
@@ -443,7 +449,7 @@ pub enum Option<T> {
443449
pub use Option::*;
444450

445451
#[lang = "phantom_data"]
446-
pub struct PhantomData<T: ?Sized>;
452+
pub struct PhantomData<T: PointeeSized>;
447453

448454
#[lang = "fn_once"]
449455
#[rustc_paren_sugar]
@@ -546,18 +552,18 @@ pub trait Deref {
546552
#[repr(transparent)]
547553
#[rustc_layout_scalar_valid_range_start(1)]
548554
#[rustc_nonnull_optimization_guaranteed]
549-
pub struct NonNull<T: ?Sized>(pub *const T);
555+
pub struct NonNull<T: PointeeSized>(pub *const T);
550556

551-
impl<T: ?Sized, U: ?Sized> CoerceUnsized<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
552-
impl<T: ?Sized, U: ?Sized> DispatchFromDyn<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
557+
impl<T: PointeeSized, U: PointeeSized> CoerceUnsized<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
558+
impl<T: PointeeSized, U: PointeeSized> DispatchFromDyn<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
553559

554-
pub struct Unique<T: ?Sized> {
560+
pub struct Unique<T: PointeeSized> {
555561
pub pointer: NonNull<T>,
556562
pub _marker: PhantomData<T>,
557563
}
558564

559-
impl<T: ?Sized, U: ?Sized> CoerceUnsized<Unique<U>> for Unique<T> where T: Unsize<U> {}
560-
impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Unique<U>> for Unique<T> where T: Unsize<U> {}
565+
impl<T: PointeeSized, U: PointeeSized> CoerceUnsized<Unique<U>> for Unique<T> where T: Unsize<U> {}
566+
impl<T: PointeeSized, U: PointeeSized> DispatchFromDyn<Unique<U>> for Unique<T> where T: Unsize<U> {}
561567

562568
#[lang = "global_alloc_ty"]
563569
pub struct Global;

‎compiler/rustc_codegen_gcc/example/mini_core.rs‎

Lines changed: 36 additions & 30 deletions
Original file line numberDiff line numberDiff line change
@@ -11,8 +11,14 @@ unsafe extern "C" fn _Unwind_Resume() {
1111
intrinsics::unreachable();
1212
}
1313

14+
#[lang = "pointee_sized"]
15+
pub trait PointeeSized {}
16+
17+
#[lang = "meta_sized"]
18+
pub trait MetaSized: PointeeSized {}
19+
1420
#[lang = "sized"]
15-
pub trait Sized {}
21+
pub trait Sized: MetaSized {}
1622

1723
#[lang = "destruct"]
1824
pub trait Destruct {}
@@ -21,35 +27,35 @@ pub trait Destruct {}
2127
pub trait Tuple {}
2228

2329
#[lang = "unsize"]
24-
pub trait Unsize<T: ?Sized> {}
30+
pub trait Unsize<T: PointeeSized>: PointeeSized {}
2531

2632
#[lang = "coerce_unsized"]
2733
pub trait CoerceUnsized<T> {}
2834

29-
impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
30-
impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a mut U> for &'a mut T {}
31-
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*const U> for *const T {}
32-
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
35+
impl<'a, 'b: 'a, T: PointeeSized + Unsize<U>, U: PointeeSized> CoerceUnsized<&'a U> for &'b T {}
36+
impl<'a, T: PointeeSized + Unsize<U>, U: PointeeSized> CoerceUnsized<&'a mut U> for &'a mut T {}
37+
impl<T: PointeeSized + Unsize<U>, U: PointeeSized> CoerceUnsized<*const U> for *const T {}
38+
impl<T: PointeeSized + Unsize<U>, U: PointeeSized> CoerceUnsized<*mut U> for *mut T {}
3339

3440
#[lang = "dispatch_from_dyn"]
3541
pub trait DispatchFromDyn<T> {}
3642

3743
// &T -> &U
38-
impl<'a, T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<&'a U> for &'a T {}
44+
impl<'a, T: PointeeSized + Unsize<U>, U: PointeeSized> DispatchFromDyn<&'a U> for &'a T {}
3945
// &mut T -> &mut U
40-
impl<'a, T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<&'a mut U> for &'a mut T {}
46+
impl<'a, T: PointeeSized + Unsize<U>, U: PointeeSized> DispatchFromDyn<&'a mut U> for &'a mut T {}
4147
// *const T -> *const U
42-
impl<T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<*const U> for *const T {}
48+
impl<T: PointeeSized + Unsize<U>, U: PointeeSized> DispatchFromDyn<*const U> for *const T {}
4349
// *mut T -> *mut U
44-
impl<T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<*mut U> for *mut T {}
45-
impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Box<U, ()>> for Box<T, ()> {}
50+
impl<T: PointeeSized + Unsize<U>, U: PointeeSized> DispatchFromDyn<*mut U> for *mut T {}
51+
impl<T: MetaSized + Unsize<U>, U: MetaSized> DispatchFromDyn<Box<U, ()>> for Box<T, ()> {}
4652

4753
#[lang = "legacy_receiver"]
4854
pub trait LegacyReceiver {}
4955

50-
impl<T: ?Sized> LegacyReceiver for &T {}
51-
impl<T: ?Sized> LegacyReceiver for &mut T {}
52-
impl<T: ?Sized, A: Allocator> LegacyReceiver for Box<T, A> {}
56+
impl<T: PointeeSized> LegacyReceiver for &T {}
57+
impl<T: PointeeSized> LegacyReceiver for &mut T {}
58+
impl<T: MetaSized> LegacyReceiver for Box<T> {}
5359

5460
#[lang = "receiver"]
5561
trait Receiver {
@@ -74,9 +80,9 @@ impl Copy for isize {}
7480
impl Copy for f32 {}
7581
impl Copy for f64 {}
7682
impl Copy for char {}
77-
impl<'a, T: ?Sized> Copy for &'a T {}
78-
impl<T: ?Sized> Copy for *const T {}
79-
impl<T: ?Sized> Copy for *mut T {}
83+
impl<'a, T: PointeeSized> Copy for &'a T {}
84+
impl<T: PointeeSized> Copy for *const T {}
85+
impl<T: PointeeSized> Copy for *mut T {}
8086

8187
#[lang = "sync"]
8288
pub unsafe trait Sync {}
@@ -92,17 +98,17 @@ unsafe impl Sync for i16 {}
9298
unsafe impl Sync for i32 {}
9399
unsafe impl Sync for isize {}
94100
unsafe impl Sync for char {}
95-
unsafe impl<'a, T: ?Sized> Sync for &'a T {}
101+
unsafe impl<'a, T: PointeeSized> Sync for &'a T {}
96102
unsafe impl Sync for [u8; 16] {}
97103

98104
#[lang = "freeze"]
99105
unsafe auto trait Freeze {}
100106

101-
unsafe impl<T: ?Sized> Freeze for PhantomData<T> {}
102-
unsafe impl<T: ?Sized> Freeze for *const T {}
103-
unsafe impl<T: ?Sized> Freeze for *mut T {}
104-
unsafe impl<T: ?Sized> Freeze for &T {}
105-
unsafe impl<T: ?Sized> Freeze for &mut T {}
107+
unsafe impl<T: PointeeSized> Freeze for PhantomData<T> {}
108+
unsafe impl<T: PointeeSized> Freeze for *const T {}
109+
unsafe impl<T: PointeeSized> Freeze for *mut T {}
110+
unsafe impl<T: PointeeSized> Freeze for &T {}
111+
unsafe impl<T: PointeeSized> Freeze for &mut T {}
106112

107113
#[lang = "structural_peq"]
108114
pub trait StructuralPartialEq {}
@@ -447,7 +453,7 @@ pub enum Option<T> {
447453
pub use Option::*;
448454

449455
#[lang = "phantom_data"]
450-
pub struct PhantomData<T: ?Sized>;
456+
pub struct PhantomData<T: PointeeSized>;
451457

452458
#[lang = "fn_once"]
453459
#[rustc_paren_sugar]
@@ -564,18 +570,18 @@ impl Allocator for Global {}
564570
#[repr(transparent)]
565571
#[rustc_layout_scalar_valid_range_start(1)]
566572
#[rustc_nonnull_optimization_guaranteed]
567-
pub struct NonNull<T: ?Sized>(pub *const T);
573+
pub struct NonNull<T: PointeeSized>(pub *const T);
568574

569-
impl<T: ?Sized, U: ?Sized> CoerceUnsized<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
570-
impl<T: ?Sized, U: ?Sized> DispatchFromDyn<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
575+
impl<T: PointeeSized, U: PointeeSized> CoerceUnsized<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
576+
impl<T: PointeeSized, U: PointeeSized> DispatchFromDyn<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
571577

572-
pub struct Unique<T: ?Sized> {
578+
pub struct Unique<T: PointeeSized> {
573579
pub pointer: NonNull<T>,
574580
pub _marker: PhantomData<T>,
575581
}
576582

577-
impl<T: ?Sized, U: ?Sized> CoerceUnsized<Unique<U>> for Unique<T> where T: Unsize<U> {}
578-
impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Unique<U>> for Unique<T> where T: Unsize<U> {}
583+
impl<T: PointeeSized, U: PointeeSized> CoerceUnsized<Unique<U>> for Unique<T> where T: Unsize<U> {}
584+
impl<T: PointeeSized, U: PointeeSized> DispatchFromDyn<Unique<U>> for Unique<T> where T: Unsize<U> {}
579585

580586
#[lang = "owned_box"]
581587
pub struct Box<T: ?Sized, A: Allocator = Global>(Unique<T>, A);

‎compiler/rustc_data_structures/src/aligned.rs‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,4 @@
1+
use std::marker::PointeeSized;
12
use std::ptr::Alignment;
23

34
/// Returns the ABI-required minimum alignment of a type in bytes.
@@ -17,7 +18,7 @@ pub const fn align_of<T: ?Sized + Aligned>() -> Alignment {
1718
/// example `[T]` has alignment of `T`.
1819
///
1920
/// [`align_of::<Self>()`]: align_of
20-
pub unsafe trait Aligned {
21+
pub unsafe trait Aligned: PointeeSized {
2122
/// Alignment of `Self`.
2223
const ALIGN: Alignment;
2324
}

‎compiler/rustc_data_structures/src/lib.rs‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -32,6 +32,7 @@
3232
#![feature(ptr_alignment_type)]
3333
#![feature(rustc_attrs)]
3434
#![feature(rustdoc_internals)]
35+
#![feature(sized_hierarchy)]
3536
#![feature(test)]
3637
#![feature(thread_id_value)]
3738
#![feature(type_alias_impl_trait)]

‎compiler/rustc_data_structures/src/marker.rs‎

Lines changed: 15 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,5 @@
11
use std::alloc::Allocator;
2+
use std::marker::PointeeSized;
23

34
#[diagnostic::on_unimplemented(message = "`{Self}` doesn't implement `DynSend`. \
45
Add it to `rustc_data_structures::marker` or use `IntoDynSyncSend` if it's already `Send`")]
@@ -15,7 +16,7 @@ pub unsafe auto trait DynSend {}
1516
pub unsafe auto trait DynSync {}
1617

1718
// Same with `Sync` and `Send`.
18-
unsafe impl<T: DynSync + ?Sized> DynSend for &T {}
19+
unsafe impl<T: DynSync + ?Sized + PointeeSized> DynSend for &T {}
1920

2021
macro_rules! impls_dyn_send_neg {
2122
($([$t1: ty $(where $($generics1: tt)*)?])*) => {
@@ -27,9 +28,9 @@ macro_rules! impls_dyn_send_neg {
2728
impls_dyn_send_neg!(
2829
[std::env::Args]
2930
[std::env::ArgsOs]
30-
[*const T where T: ?Sized]
31-
[*mut T where T: ?Sized]
32-
[std::ptr::NonNull<T> where T: ?Sized]
31+
[*const T where T: ?Sized + PointeeSized]
32+
[*mut T where T: ?Sized + PointeeSized]
33+
[std::ptr::NonNull<T> where T: ?Sized + PointeeSized]
3334
[std::rc::Rc<T, A> where T: ?Sized, A: Allocator]
3435
[std::rc::Weak<T, A> where T: ?Sized, A: Allocator]
3536
[std::sync::MutexGuard<'_, T> where T: ?Sized]
@@ -100,12 +101,12 @@ macro_rules! impls_dyn_sync_neg {
100101
impls_dyn_sync_neg!(
101102
[std::env::Args]
102103
[std::env::ArgsOs]
103-
[*const T where T: ?Sized]
104-
[*mut T where T: ?Sized]
104+
[*const T where T: ?Sized + PointeeSized]
105+
[*mut T where T: ?Sized + PointeeSized]
105106
[std::cell::Cell<T> where T: ?Sized]
106107
[std::cell::RefCell<T> where T: ?Sized]
107108
[std::cell::UnsafeCell<T> where T: ?Sized]
108-
[std::ptr::NonNull<T> where T: ?Sized]
109+
[std::ptr::NonNull<T> where T: ?Sized + PointeeSized]
109110
[std::rc::Rc<T, A> where T: ?Sized, A: Allocator]
110111
[std::rc::Weak<T, A> where T: ?Sized, A: Allocator]
111112
[std::cell::OnceCell<T> where T]
@@ -175,10 +176,10 @@ impl_dyn_sync!(
175176
[thin_vec::ThinVec<T> where T: DynSync]
176177
);
177178

178-
pub fn assert_dyn_sync<T: ?Sized + DynSync>() {}
179-
pub fn assert_dyn_send<T: ?Sized + DynSend>() {}
180-
pub fn assert_dyn_send_val<T: ?Sized + DynSend>(_t: &T) {}
181-
pub fn assert_dyn_send_sync_val<T: ?Sized + DynSync + DynSend>(_t: &T) {}
179+
pub fn assert_dyn_sync<T: ?Sized + PointeeSized + DynSync>() {}
180+
pub fn assert_dyn_send<T: ?Sized + PointeeSized + DynSend>() {}
181+
pub fn assert_dyn_send_val<T: ?Sized + PointeeSized + DynSend>(_t: &T) {}
182+
pub fn assert_dyn_send_sync_val<T: ?Sized + PointeeSized + DynSync + DynSend>(_t: &T) {}
182183

183184
#[derive(Copy, Clone)]
184185
pub struct FromDyn<T>(T);
@@ -231,10 +232,10 @@ impl<T> std::ops::DerefMut for FromDyn<T> {
231232
// an instance of `DynSend` and `DynSync`, since the compiler cannot infer
232233
// it automatically in some cases. (e.g. Box<dyn Send / Sync>)
233234
#[derive(Copy, Clone)]
234-
pub struct IntoDynSyncSend<T: ?Sized>(pub T);
235+
pub struct IntoDynSyncSend<T: ?Sized + PointeeSized>(pub T);
235236

236-
unsafe impl<T: ?Sized + Send> DynSend for IntoDynSyncSend<T> {}
237-
unsafe impl<T: ?Sized + Sync> DynSync for IntoDynSyncSend<T> {}
237+
unsafe impl<T: ?Sized + PointeeSized + Send> DynSend for IntoDynSyncSend<T> {}
238+
unsafe impl<T: ?Sized + PointeeSized + Sync> DynSync for IntoDynSyncSend<T> {}
238239

239240
impl<T> std::ops::Deref for IntoDynSyncSend<T> {
240241
type Target = T;

‎compiler/rustc_feature/src/unstable.rs‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -237,6 +237,8 @@ declare_features! (
237237
(internal, profiler_runtime, "1.18.0", None),
238238
/// Allows using `rustc_*` attributes (RFC 572).
239239
(internal, rustc_attrs, "1.0.0", None),
240+
/// Introduces a hierarchy of `Sized` traits (RFC 3729).
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(unstable, sized_hierarchy, "CURRENT_RUSTC_VERSION", None),
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/// Allows using the `#[stable]` and `#[unstable]` attributes.
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(internal, staged_api, "1.0.0", None),
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/// Added for testing unstable lints; perma-unstable.

‎compiler/rustc_hir/src/lang_items.rs‎

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@@ -165,6 +165,8 @@ pub fn extract(attrs: &[impl AttributeExt]) -> Option<(Symbol, Span)> {
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language_item_table! {
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// Variant name, Name, Getter method name, Target Generic requirements;
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Sized, sym::sized, sized_trait, Target::Trait, GenericRequirement::Exact(0);
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MetaSized, sym::meta_sized, meta_sized_trait, Target::Trait, GenericRequirement::Exact(0);
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PointeeSized, sym::pointee_sized, pointee_sized_trait, Target::Trait, GenericRequirement::Exact(0);
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Unsize, sym::unsize, unsize_trait, Target::Trait, GenericRequirement::Minimum(1);
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/// Trait injected by `#[derive(PartialEq)]`, (i.e. "Partial EQ").
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StructuralPeq, sym::structural_peq, structural_peq_trait, Target::Trait, GenericRequirement::None;

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