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Remove suspicious auto trait lint

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This commit is contained in:
Santiago Pastorino 2024-02-19 17:39:25 -03:00
parent eee9d2a773
commit 086463b227
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GPG key ID: 8131A24E0C79EFAF
23 changed files with 78 additions and 527 deletions
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164
compiler/rustc_hir_analysis/src/coherence/orphan.rs
View file

@ -1,20 +1,12 @@
//! Orphan checker: every impl either implements a trait defined in this
//! crate or pertains to a type defined in this crate.
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::{DelayDm, ErrorGuaranteed};
use rustc_errors::ErrorGuaranteed;
use rustc_hir as hir;
use rustc_middle::ty::util::CheckRegions;
use rustc_middle::ty::GenericArgs;
use rustc_middle::ty::{
self, AliasKind, ImplPolarity, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitableExt,
TypeVisitor,
};
use rustc_session::lint;
use rustc_span::def_id::{DefId, LocalDefId};
use rustc_middle::ty::{self, AliasKind, Ty, TyCtxt, TypeVisitableExt};
use rustc_span::def_id::LocalDefId;
use rustc_span::Span;
use rustc_trait_selection::traits;
use std::ops::ControlFlow;
use crate::errors;
@ -26,12 +18,7 @@ pub(crate) fn orphan_check_impl(
let trait_ref = tcx.impl_trait_ref(impl_def_id).unwrap().instantiate_identity();
trait_ref.error_reported()?;
let ret = do_orphan_check_impl(tcx, trait_ref, impl_def_id);
if tcx.trait_is_auto(trait_ref.def_id) {
lint_auto_trait_impl(tcx, trait_ref, impl_def_id);
}
ret
do_orphan_check_impl(tcx, trait_ref, impl_def_id)
}
fn do_orphan_check_impl<'tcx>(
@ -445,146 +432,3 @@ fn emit_orphan_check_error<'tcx>(
}
})
}
/// Lint impls of auto traits if they are likely to have
/// unsound or surprising effects on auto impls.
fn lint_auto_trait_impl<'tcx>(
tcx: TyCtxt<'tcx>,
trait_ref: ty::TraitRef<'tcx>,
impl_def_id: LocalDefId,
) {
if trait_ref.args.len() != 1 {
tcx.dcx().span_delayed_bug(
tcx.def_span(impl_def_id),
"auto traits cannot have generic parameters",
);
return;
}
let self_ty = trait_ref.self_ty();
let (self_type_did, args) = match self_ty.kind() {
ty::Adt(def, args) => (def.did(), args),
_ => {
// FIXME: should also lint for stuff like `&i32` but
// considering that auto traits are unstable, that
// isn't too important for now as this only affects
// crates using `nightly`, and std.
return;
}
};
// Impls which completely cover a given root type are fine as they
// disable auto impls entirely. So only lint if the args
// are not a permutation of the identity args.
let Err(arg) = tcx.uses_unique_generic_params(args, CheckRegions::No) else {
// ok
return;
};
// Ideally:
//
// - compute the requirements for the auto impl candidate
// - check whether these are implied by the non covering impls
// - if not, emit the lint
//
// What we do here is a bit simpler:
//
// - badly check if an auto impl candidate definitely does not apply
// for the given simplified type
// - if so, do not lint
if fast_reject_auto_impl(tcx, trait_ref.def_id, self_ty) {
// ok
return;
}
tcx.node_span_lint(
lint::builtin::SUSPICIOUS_AUTO_TRAIT_IMPLS,
tcx.local_def_id_to_hir_id(impl_def_id),
tcx.def_span(impl_def_id),
DelayDm(|| {
format!(
"cross-crate traits with a default impl, like `{}`, \
should not be specialized",
tcx.def_path_str(trait_ref.def_id),
)
}),
|lint| {
let item_span = tcx.def_span(self_type_did);
let self_descr = tcx.def_descr(self_type_did);
match arg {
ty::util::NotUniqueParam::DuplicateParam(arg) => {
lint.note(format!("`{arg}` is mentioned multiple times"));
}
ty::util::NotUniqueParam::NotParam(arg) => {
lint.note(format!("`{arg}` is not a generic parameter"));
}
}
lint.span_note(
item_span,
format!(
"try using the same sequence of generic parameters as the {self_descr} definition",
),
);
},
);
}
fn fast_reject_auto_impl<'tcx>(tcx: TyCtxt<'tcx>, trait_def_id: DefId, self_ty: Ty<'tcx>) -> bool {
struct DisableAutoTraitVisitor<'tcx> {
tcx: TyCtxt<'tcx>,
trait_def_id: DefId,
self_ty_root: Ty<'tcx>,
seen: FxHashSet<DefId>,
}
impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for DisableAutoTraitVisitor<'tcx> {
type BreakTy = ();
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
let tcx = self.tcx;
if ty != self.self_ty_root {
for impl_def_id in tcx.non_blanket_impls_for_ty(self.trait_def_id, ty) {
match tcx.impl_polarity(impl_def_id) {
ImplPolarity::Negative => return ControlFlow::Break(()),
ImplPolarity::Reservation => {}
// FIXME(@lcnr): That's probably not good enough, idk
//
// We might just want to take the rustdoc code and somehow avoid
// explicit impls for `Self`.
ImplPolarity::Positive => return ControlFlow::Continue(()),
}
}
}
match ty.kind() {
ty::Adt(def, args) if def.is_phantom_data() => args.visit_with(self),
ty::Adt(def, args) => {
// @lcnr: This is the only place where cycles can happen. We avoid this
// by only visiting each `DefId` once.
//
// This will be is incorrect in subtle cases, but I don't care :)
if self.seen.insert(def.did()) {
for ty in def.all_fields().map(|field| field.ty(tcx, args)) {
ty.visit_with(self)?;
}
}
ControlFlow::Continue(())
}
_ => ty.super_visit_with(self),
}
}
}
let self_ty_root = match self_ty.kind() {
ty::Adt(def, _) => Ty::new_adt(tcx, *def, GenericArgs::identity_for_item(tcx, def.did())),
_ => unimplemented!("unexpected self ty {:?}", self_ty),
};
self_ty_root
.visit_with(&mut DisableAutoTraitVisitor {
tcx,
self_ty_root,
trait_def_id,
seen: FxHashSet::default(),
})
.is_break()
}

5
compiler/rustc_lint/src/lib.rs
View file

@ -524,6 +524,11 @@ fn register_builtins(store: &mut LintStore) {
"no longer needed, see RFC #3535 \
<https://rust-lang.github.io/rfcs/3535-constants-in-patterns.html> for more information",
);
store.register_removed(
"suspicious_auto_trait_impls",
"no longer needed, see #93367 \
<https://github.com/rust-lang/rust/issues/93367> for more information",
);
}
fn register_internals(store: &mut LintStore) {

35
compiler/rustc_lint_defs/src/builtin.rs
View file

@ -90,7 +90,6 @@ declare_lint_pass! {
SOFT_UNSTABLE,
STABLE_FEATURES,
STATIC_MUT_REFS,
SUSPICIOUS_AUTO_TRAIT_IMPLS,
TEST_UNSTABLE_LINT,
TEXT_DIRECTION_CODEPOINT_IN_COMMENT,
TRIVIAL_CASTS,
@ -4032,40 +4031,6 @@ declare_lint! {
"duplicated attribute"
}
declare_lint! {
/// The `suspicious_auto_trait_impls` lint checks for potentially incorrect
/// implementations of auto traits.
///
/// ### Example
///
/// ```rust
/// struct Foo<T>(T);
///
/// unsafe impl<T> Send for Foo<*const T> {}
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
/// A type can implement auto traits, e.g. `Send`, `Sync` and `Unpin`,
/// in two different ways: either by writing an explicit impl or if
/// all fields of the type implement that auto trait.
///
/// The compiler disables the automatic implementation if an explicit one
/// exists for given type constructor. The exact rules governing this
/// were previously unsound, quite subtle, and have been recently modified.
/// This change caused the automatic implementation to be disabled in more
/// cases, potentially breaking some code.
pub SUSPICIOUS_AUTO_TRAIT_IMPLS,
Warn,
"the rules governing auto traits have recently changed resulting in potential breakage",
@future_incompatible = FutureIncompatibleInfo {
reason: FutureIncompatibilityReason::FutureReleaseSemanticsChange,
reference: "issue #93367 <https://github.com/rust-lang/rust/issues/93367>",
};
}
declare_lint! {
/// The `deprecated_where_clause_location` lint detects when a where clause in front of the equals
/// in an associated type.

1
src/tools/clippy/tests/ui/non_send_fields_in_send_ty.rs
View file

@ -1,5 +1,4 @@
#![warn(clippy::non_send_fields_in_send_ty)]
#![allow(suspicious_auto_trait_impls)]
#![feature(extern_types)]
use std::cell::UnsafeCell;

52
src/tools/clippy/tests/ui/non_send_fields_in_send_ty.stderr
View file

@ -1,11 +1,11 @@
error: some fields in `RingBuffer<T>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:17:1
--> $DIR/non_send_fields_in_send_ty.rs:16:1
|
LL | unsafe impl<T> Send for RingBuffer<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `data` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:12:5
--> $DIR/non_send_fields_in_send_ty.rs:11:5
|
LL | data: Vec<UnsafeCell<T>>,
| ^^^^^^^^^^^^^^^^^^^^^^^^
@ -14,155 +14,155 @@ LL | data: Vec<UnsafeCell<T>>,
= help: to override `-D warnings` add `#[allow(clippy::non_send_fields_in_send_ty)]`
error: some fields in `MvccRwLock<T>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:26:1
--> $DIR/non_send_fields_in_send_ty.rs:25:1
|
LL | unsafe impl<T> Send for MvccRwLock<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `lock` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:23:5
--> $DIR/non_send_fields_in_send_ty.rs:22:5
|
LL | lock: Mutex<Box<T>>,
| ^^^^^^^^^^^^^^^^^^^
= help: add bounds on type parameter `T` that satisfy `Mutex<Box<T>>: Send`
error: some fields in `ArcGuard<RC, T>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:35:1
--> $DIR/non_send_fields_in_send_ty.rs:34:1
|
LL | unsafe impl<RC, T: Send> Send for ArcGuard<RC, T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `head` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:32:5
--> $DIR/non_send_fields_in_send_ty.rs:31:5
|
LL | head: Arc<RC>,
| ^^^^^^^^^^^^^
= help: add bounds on type parameter `RC` that satisfy `Arc<RC>: Send`
error: some fields in `DeviceHandle<T>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:52:1
--> $DIR/non_send_fields_in_send_ty.rs:51:1
|
LL | unsafe impl<T: UsbContext> Send for DeviceHandle<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `context` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:48:5
--> $DIR/non_send_fields_in_send_ty.rs:47:5
|
LL | context: T,
| ^^^^^^^^^^
= help: add `T: Send` bound in `Send` impl
error: some fields in `NoGeneric` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:60:1
--> $DIR/non_send_fields_in_send_ty.rs:59:1
|
LL | unsafe impl Send for NoGeneric {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `rc_is_not_send` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:57:5
--> $DIR/non_send_fields_in_send_ty.rs:56:5
|
LL | rc_is_not_send: Rc<String>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
= help: use a thread-safe type that implements `Send`
error: some fields in `MultiField<T>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:69:1
--> $DIR/non_send_fields_in_send_ty.rs:68:1
|
LL | unsafe impl<T> Send for MultiField<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `field1` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:64:5
--> $DIR/non_send_fields_in_send_ty.rs:63:5
|
LL | field1: T,
| ^^^^^^^^^
= help: add `T: Send` bound in `Send` impl
note: it is not safe to send field `field2` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:65:5
--> $DIR/non_send_fields_in_send_ty.rs:64:5
|
LL | field2: T,
| ^^^^^^^^^
= help: add `T: Send` bound in `Send` impl
note: it is not safe to send field `field3` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:66:5
--> $DIR/non_send_fields_in_send_ty.rs:65:5
|
LL | field3: T,
| ^^^^^^^^^
= help: add `T: Send` bound in `Send` impl
error: some fields in `MyOption<T>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:77:1
--> $DIR/non_send_fields_in_send_ty.rs:76:1
|
LL | unsafe impl<T> Send for MyOption<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `0` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:73:12
--> $DIR/non_send_fields_in_send_ty.rs:72:12
|
LL | MySome(T),
| ^
= help: add `T: Send` bound in `Send` impl
error: some fields in `MultiParam<A, B>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:90:1
--> $DIR/non_send_fields_in_send_ty.rs:89:1
|
LL | unsafe impl<A, B> Send for MultiParam<A, B> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `vec` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:87:5
--> $DIR/non_send_fields_in_send_ty.rs:86:5
|
LL | vec: Vec<(A, B)>,
| ^^^^^^^^^^^^^^^^
= help: add bounds on type parameters `A, B` that satisfy `Vec<(A, B)>: Send`
error: some fields in `HeuristicTest` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:109:1
--> $DIR/non_send_fields_in_send_ty.rs:108:1
|
LL | unsafe impl Send for HeuristicTest {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `field4` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:104:5
--> $DIR/non_send_fields_in_send_ty.rs:103:5
|
LL | field4: (*const NonSend, Rc<u8>),
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= help: use a thread-safe type that implements `Send`
error: some fields in `AttrTest3<T>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:129:1
--> $DIR/non_send_fields_in_send_ty.rs:128:1
|
LL | unsafe impl<T> Send for AttrTest3<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `0` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:124:11
--> $DIR/non_send_fields_in_send_ty.rs:123:11
|
LL | Enum2(T),
| ^
= help: add `T: Send` bound in `Send` impl
error: some fields in `Complex<P, u32>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:138:1
--> $DIR/non_send_fields_in_send_ty.rs:137:1
|
LL | unsafe impl<P> Send for Complex<P, u32> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `field1` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:134:5
--> $DIR/non_send_fields_in_send_ty.rs:133:5
|
LL | field1: A,
| ^^^^^^^^^
= help: add `P: Send` bound in `Send` impl
error: some fields in `Complex<Q, MutexGuard<'static, bool>>` are not safe to be sent to another thread
--> $DIR/non_send_fields_in_send_ty.rs:142:1
--> $DIR/non_send_fields_in_send_ty.rs:141:1
|
LL | unsafe impl<Q: Send> Send for Complex<Q, MutexGuard<'static, bool>> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: it is not safe to send field `field2` to another thread
--> $DIR/non_send_fields_in_send_ty.rs:135:5
--> $DIR/non_send_fields_in_send_ty.rs:134:5
|
LL | field2: B,
| ^^^^^^^^^

5
src/tools/rust-analyzer/crates/ide-db/src/generated/lints.rs
View file

@ -502,10 +502,6 @@ pub const DEFAULT_LINTS: &[Lint] = &[
label: "stable_features",
description: r##"stable features found in `#[feature]` directive"##,
},
Lint {
label: "suspicious_auto_trait_impls",
description: r##"the rules governing auto traits have recently changed resulting in potential breakage"##,
},
Lint {
label: "suspicious_double_ref_op",
description: r##"suspicious call of trait method on `&&T`"##,
@ -778,7 +774,6 @@ pub const DEFAULT_LINT_GROUPS: &[LintGroup] = &[
"repr_transparent_external_private_fields",
"semicolon_in_expressions_from_macros",
"soft_unstable",
"suspicious_auto_trait_impls",
"uninhabited_static",
"unstable_name_collisions",
"unstable_syntax_pre_expansion",

2
tests/ui/auto-traits/issue-117789.rs
View file

@ -1,5 +1,3 @@
#![deny(suspicious_auto_trait_impls)]
auto trait Trait<P> {} //~ ERROR auto traits cannot have generic parameters
//~^ ERROR auto traits are experimental and possibly buggy
impl<P> Trait<P> for () {}

4
tests/ui/auto-traits/issue-117789.stderr
View file

@ -1,5 +1,5 @@
error[E0567]: auto traits cannot have generic parameters
--> $DIR/issue-117789.rs:3:17
--> $DIR/issue-117789.rs:1:17
|
LL | auto trait Trait<P> {}
| -----^^^ help: remove the parameters
@ -7,7 +7,7 @@ LL | auto trait Trait<P> {}
| auto trait cannot have generic parameters
error[E0658]: auto traits are experimental and possibly buggy
--> $DIR/issue-117789.rs:3:1
--> $DIR/issue-117789.rs:1:1
|
LL | auto trait Trait<P> {}
| ^^^^^^^^^^^^^^^^^^^^^^

1
tests/ui/auto-traits/issue-83857-ub.rs
View file

@ -1,4 +1,3 @@
#![allow(suspicious_auto_trait_impls)]
// Tests that we don't incorrectly allow overlap between a builtin auto trait
// impl and a user written one. See #83857 for more details

12
tests/ui/auto-traits/issue-83857-ub.stderr
View file

@ -1,12 +1,12 @@
error[E0277]: `Foo<T, U>` cannot be sent between threads safely
--> $DIR/issue-83857-ub.rs:22:38
--> $DIR/issue-83857-ub.rs:21:38
|
LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Foo<T, U>` cannot be sent between threads safely
|
= help: the trait `Send` is not implemented for `Foo<T, U>`, which is required by `Foo<T, U>: WithAssoc`
note: required for `Foo<T, U>` to implement `WithAssoc`
--> $DIR/issue-83857-ub.rs:15:15
--> $DIR/issue-83857-ub.rs:14:15
|
LL | impl<T: Send> WithAssoc for T {
| ---- ^^^^^^^^^ ^
@ -18,7 +18,7 @@ LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i
| +++++++++++++++++++++
error[E0277]: `Foo<T, U>` cannot be sent between threads safely
--> $DIR/issue-83857-ub.rs:22:80
--> $DIR/issue-83857-ub.rs:21:80
|
LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) {
| ________________________________________________________________________________^
@ -31,7 +31,7 @@ LL | | }
|
= help: the trait `Send` is not implemented for `Foo<T, U>`, which is required by `Foo<T, U>: WithAssoc`
note: required for `Foo<T, U>` to implement `WithAssoc`
--> $DIR/issue-83857-ub.rs:15:15
--> $DIR/issue-83857-ub.rs:14:15
|
LL | impl<T: Send> WithAssoc for T {
| ---- ^^^^^^^^^ ^
@ -43,7 +43,7 @@ LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i
| +++++++++++++++++++++
error[E0277]: `Foo<T, U>` cannot be sent between threads safely
--> $DIR/issue-83857-ub.rs:25:11
--> $DIR/issue-83857-ub.rs:24:11
|
LL | f(foo(v));
| --- ^ `Foo<T, U>` cannot be sent between threads safely
@ -52,7 +52,7 @@ LL | f(foo(v));
|
= help: the trait `Send` is not implemented for `Foo<T, U>`
note: required by a bound in `foo`
--> $DIR/issue-83857-ub.rs:29:11
--> $DIR/issue-83857-ub.rs:28:11
|
LL | fn foo<T: Send>(x: T) -> <T as WithAssoc>::Output {
| ^^^^ required by this bound in `foo`

50
tests/ui/auto-traits/suspicious-impls-lint.rs
View file

@ -1,50 +0,0 @@
#![deny(suspicious_auto_trait_impls)]
use std::marker::PhantomData;
struct MayImplementSendOk<T>(T);
unsafe impl<T: Send> Send for MayImplementSendOk<T> {} // ok
struct MayImplementSendErr<T>(T);
unsafe impl<T: Send> Send for MayImplementSendErr<&T> {}
//~^ ERROR
//~| WARNING this will change its meaning
struct ContainsNonSendDirect<T>(*const T);
unsafe impl<T: Send> Send for ContainsNonSendDirect<&T> {} // ok
struct ContainsPtr<T>(*const T);
struct ContainsIndirectNonSend<T>(ContainsPtr<T>);
unsafe impl<T: Send> Send for ContainsIndirectNonSend<&T> {} // ok
struct ContainsVec<T>(Vec<T>);
unsafe impl Send for ContainsVec<i32> {}
//~^ ERROR
//~| WARNING this will change its meaning
struct TwoParams<T, U>(T, U);
unsafe impl<T: Send, U: Send> Send for TwoParams<T, U> {} // ok
struct TwoParamsFlipped<T, U>(T, U);
unsafe impl<T: Send, U: Send> Send for TwoParamsFlipped<U, T> {} // ok
struct TwoParamsSame<T, U>(T, U);
unsafe impl<T: Send> Send for TwoParamsSame<T, T> {}
//~^ ERROR
//~| WARNING this will change its meaning
pub struct WithPhantomDataNonSend<T, U>(PhantomData<*const T>, U);
unsafe impl<T> Send for WithPhantomDataNonSend<T, i8> {} // ok
pub struct WithPhantomDataSend<T, U>(PhantomData<T>, U);
unsafe impl<T> Send for WithPhantomDataSend<*const T, i8> {}
//~^ ERROR
//~| WARNING this will change its meaning
pub struct WithLifetime<'a, T>(&'a (), T);
unsafe impl<T> Send for WithLifetime<'static, T> {} // ok
unsafe impl<T> Sync for WithLifetime<'static, Vec<T>> {}
//~^ ERROR
//~| WARNING this will change its meaning
fn main() {}

82
tests/ui/auto-traits/suspicious-impls-lint.stderr
View file

@ -1,82 +0,0 @@
error: cross-crate traits with a default impl, like `Send`, should not be specialized
--> $DIR/suspicious-impls-lint.rs:9:1
|
LL | unsafe impl<T: Send> Send for MayImplementSendErr<&T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `&T` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/suspicious-impls-lint.rs:8:1
|
LL | struct MayImplementSendErr<T>(T);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: the lint level is defined here
--> $DIR/suspicious-impls-lint.rs:1:9
|
LL | #![deny(suspicious_auto_trait_impls)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: cross-crate traits with a default impl, like `Send`, should not be specialized
--> $DIR/suspicious-impls-lint.rs:21:1
|
LL | unsafe impl Send for ContainsVec<i32> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `i32` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/suspicious-impls-lint.rs:20:1
|
LL | struct ContainsVec<T>(Vec<T>);
| ^^^^^^^^^^^^^^^^^^^^^
error: cross-crate traits with a default impl, like `Send`, should not be specialized
--> $DIR/suspicious-impls-lint.rs:32:1
|
LL | unsafe impl<T: Send> Send for TwoParamsSame<T, T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `T` is mentioned multiple times
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/suspicious-impls-lint.rs:31:1
|
LL | struct TwoParamsSame<T, U>(T, U);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
error: cross-crate traits with a default impl, like `Send`, should not be specialized
--> $DIR/suspicious-impls-lint.rs:40:1
|
LL | unsafe impl<T> Send for WithPhantomDataSend<*const T, i8> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `*const T` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/suspicious-impls-lint.rs:39:1
|
LL | pub struct WithPhantomDataSend<T, U>(PhantomData<T>, U);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: cross-crate traits with a default impl, like `Sync`, should not be specialized
--> $DIR/suspicious-impls-lint.rs:46:1
|
LL | unsafe impl<T> Sync for WithLifetime<'static, Vec<T>> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `Vec<T>` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/suspicious-impls-lint.rs:44:1
|
LL | pub struct WithLifetime<'a, T>(&'a (), T);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 5 previous errors

21
tests/ui/auto-traits/suspicious-negative-impls-lint.rs
View file

@ -1,21 +0,0 @@
#![feature(negative_impls)]
#![deny(suspicious_auto_trait_impls)]
use std::marker::PhantomData;
struct ContainsVec<T>(Vec<T>);
impl !Send for ContainsVec<u32> {}
//~^ ERROR
//~| WARNING this will change its meaning
pub struct WithPhantomDataSend<T, U>(PhantomData<T>, U);
impl<T> !Send for WithPhantomDataSend<*const T, u8> {}
//~^ ERROR
//~| WARNING this will change its meaning
pub struct WithLifetime<'a, T>(&'a (), T);
impl<T> !Sync for WithLifetime<'static, Option<T>> {}
//~^ ERROR
//~| WARNING this will change its meaning
fn main() {}

52
tests/ui/auto-traits/suspicious-negative-impls-lint.stderr
View file

@ -1,52 +0,0 @@
error: cross-crate traits with a default impl, like `Send`, should not be specialized
--> $DIR/suspicious-negative-impls-lint.rs:7:1
|
LL | impl !Send for ContainsVec<u32> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `u32` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/suspicious-negative-impls-lint.rs:6:1
|
LL | struct ContainsVec<T>(Vec<T>);
| ^^^^^^^^^^^^^^^^^^^^^
note: the lint level is defined here
--> $DIR/suspicious-negative-impls-lint.rs:2:9
|
LL | #![deny(suspicious_auto_trait_impls)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: cross-crate traits with a default impl, like `Send`, should not be specialized
--> $DIR/suspicious-negative-impls-lint.rs:12:1
|
LL | impl<T> !Send for WithPhantomDataSend<*const T, u8> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `*const T` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/suspicious-negative-impls-lint.rs:11:1
|
LL | pub struct WithPhantomDataSend<T, U>(PhantomData<T>, U);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: cross-crate traits with a default impl, like `Sync`, should not be specialized
--> $DIR/suspicious-negative-impls-lint.rs:17:1
|
LL | impl<T> !Sync for WithLifetime<'static, Option<T>> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `Option<T>` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/suspicious-negative-impls-lint.rs:16:1
|
LL | pub struct WithLifetime<'a, T>(&'a (), T);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 3 previous errors

2
tests/ui/coherence/coherence-conflicting-negative-trait-impl.rs
View file

@ -13,7 +13,5 @@ impl<T: MyTrait> !Send for TestType<T> {} //~ ERROR found both positive and nega
unsafe impl<T: 'static> Send for TestType<T> {} //~ ERROR conflicting implementations
impl !Send for TestType<i32> {}
//~^ WARNING
//~| WARNING this will change its meaning
fn main() {}

18
tests/ui/coherence/coherence-conflicting-negative-trait-impl.stderr
View file

@ -16,23 +16,7 @@ LL | unsafe impl<T: MyTrait + 'static> Send for TestType<T> {}
LL | unsafe impl<T: 'static> Send for TestType<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `TestType<_>`
warning: cross-crate traits with a default impl, like `Send`, should not be specialized
--> $DIR/coherence-conflicting-negative-trait-impl.rs:15:1
|
LL | impl !Send for TestType<i32> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `i32` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/coherence-conflicting-negative-trait-impl.rs:7:1
|
LL | struct TestType<T>(::std::marker::PhantomData<T>);
| ^^^^^^^^^^^^^^^^^^
= note: `#[warn(suspicious_auto_trait_impls)]` on by default
error: aborting due to 2 previous errors; 1 warning emitted
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0119, E0751.
For more information about an error, try `rustc --explain E0119`.

12
tests/ui/coherence/coherence-orphan.rs
View file

@ -7,18 +7,16 @@ use lib::TheTrait;
struct TheType;
impl TheTrait<usize> for isize { }
impl TheTrait<usize> for isize {}
//~^ ERROR E0117
//~| ERROR not all trait items implemented
impl TheTrait<TheType> for isize { }
impl TheTrait<TheType> for isize {}
//~^ ERROR not all trait items implemented
impl TheTrait<isize> for TheType { }
impl TheTrait<isize> for TheType {}
//~^ ERROR not all trait items implemented
impl !Send for Vec<isize> { } //~ ERROR E0117
//~^ WARNING
//~| WARNING this will change its meaning
impl !Send for Vec<isize> {} //~ ERROR E0117
fn main() { }
fn main() {}

25
tests/ui/coherence/coherence-orphan.stderr
View file

@ -1,7 +1,7 @@
error[E0117]: only traits defined in the current crate can be implemented for primitive types
--> $DIR/coherence-orphan.rs:10:1
|
LL | impl TheTrait<usize> for isize { }
LL | impl TheTrait<usize> for isize {}
| ^^^^^---------------^^^^^-----
| | | |
| | | `isize` is not defined in the current crate
@ -13,7 +13,7 @@ LL | impl TheTrait<usize> for isize { }
error[E0117]: only traits defined in the current crate can be implemented for types defined outside of the crate
--> $DIR/coherence-orphan.rs:20:1
|
LL | impl !Send for Vec<isize> { }
LL | impl !Send for Vec<isize> {}
| ^^^^^^^^^^^^^^^----------
| | |
| | `Vec` is not defined in the current crate
@ -21,23 +21,10 @@ LL | impl !Send for Vec<isize> { }
|
= note: define and implement a trait or new type instead
warning: cross-crate traits with a default impl, like `Send`, should not be specialized
--> $DIR/coherence-orphan.rs:20:1
|
LL | impl !Send for Vec<isize> { }
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `isize` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
= note: `#[warn(suspicious_auto_trait_impls)]` on by default
error[E0046]: not all trait items implemented, missing: `the_fn`
--> $DIR/coherence-orphan.rs:10:1
|
LL | impl TheTrait<usize> for isize { }
LL | impl TheTrait<usize> for isize {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `the_fn` in implementation
|
= help: implement the missing item: `fn the_fn(&self) { todo!() }`
@ -45,7 +32,7 @@ LL | impl TheTrait<usize> for isize { }
error[E0046]: not all trait items implemented, missing: `the_fn`
--> $DIR/coherence-orphan.rs:14:1
|
LL | impl TheTrait<TheType> for isize { }
LL | impl TheTrait<TheType> for isize {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `the_fn` in implementation
|
= help: implement the missing item: `fn the_fn(&self) { todo!() }`
@ -53,12 +40,12 @@ LL | impl TheTrait<TheType> for isize { }
error[E0046]: not all trait items implemented, missing: `the_fn`
--> $DIR/coherence-orphan.rs:17:1
|
LL | impl TheTrait<isize> for TheType { }
LL | impl TheTrait<isize> for TheType {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `the_fn` in implementation
|
= help: implement the missing item: `fn the_fn(&self) { todo!() }`
error: aborting due to 5 previous errors; 1 warning emitted
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0046, E0117.
For more information about an error, try `rustc --explain E0046`.

13
tests/ui/coherence/coherence-overlap-negative-impls.rs
View file

@ -15,16 +15,20 @@ struct Test;
trait Fold<F> {}
impl<T, F> Fold<F> for Cons<T> // 0
impl<T, F> Fold<F> for Cons<T>
// 0
where
T: Fold<Nil>,
{}
{
}
impl<T, F> Fold<F> for Cons<T> // 1
impl<T, F> Fold<F> for Cons<T>
// 1
where
T: Fold<F>,
private::Is<T>: private::NotNil,
{}
{
}
impl<F> Fold<F> for Test {} // 2
@ -34,7 +38,6 @@ mod private {
pub struct Is<T>(T);
pub auto trait NotNil {}
#[allow(suspicious_auto_trait_impls)]
impl !NotNil for Is<Nil> {}
}

2
tests/ui/issues/issue-106755.rs
View file

@ -15,7 +15,5 @@ impl<T: MyTrait> !Send for TestType<T> {} //~ ERROR found both positive and nega
unsafe impl<T: 'static> Send for TestType<T> {} //~ ERROR conflicting implementations
impl !Send for TestType<i32> {}
//~^ WARNING
//~| WARNING this will change its meaning
fn main() {}

18
tests/ui/issues/issue-106755.stderr
View file

@ -16,23 +16,7 @@ LL | unsafe impl<T: MyTrait + 'static> Send for TestType<T> {}
LL | unsafe impl<T: 'static> Send for TestType<T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `TestType<_>`
warning: cross-crate traits with a default impl, like `Send`, should not be specialized
--> $DIR/issue-106755.rs:17:1
|
LL | impl !Send for TestType<i32> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= warning: this will change its meaning in a future release!
= note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
= note: `i32` is not a generic parameter
note: try using the same sequence of generic parameters as the struct definition
--> $DIR/issue-106755.rs:9:1
|
LL | struct TestType<T>(::std::marker::PhantomData<T>);
| ^^^^^^^^^^^^^^^^^^
= note: `#[warn(suspicious_auto_trait_impls)]` on by default
error: aborting due to 2 previous errors; 1 warning emitted
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0119, E0751.
For more information about an error, try `rustc --explain E0119`.

13
tests/ui/typeck/typeck-default-trait-impl-cross-crate-coherence.rs
View file

@ -1,5 +1,4 @@
//@ aux-build:tdticc_coherence_lib.rs
#![allow(suspicious_auto_trait_impls)]
// Test that we do not consider associated types to be sendable without
// some applicable trait bound (and we don't ICE).
@ -11,15 +10,15 @@ extern crate tdticc_coherence_lib as lib;
use lib::DefaultedTrait;
struct A;
impl DefaultedTrait for (A,) { } //~ ERROR E0117
impl DefaultedTrait for (A,) {} //~ ERROR E0117
struct B;
impl !DefaultedTrait for (B,) { } //~ ERROR E0117
impl !DefaultedTrait for (B,) {} //~ ERROR E0117
struct C;
struct D<T>(T);
impl DefaultedTrait for Box<C> { } //~ ERROR E0321
impl DefaultedTrait for lib::Something<C> { } //~ ERROR E0117
impl DefaultedTrait for D<C> { } // OK
impl DefaultedTrait for Box<C> {} //~ ERROR E0321
impl DefaultedTrait for lib::Something<C> {} //~ ERROR E0117
impl DefaultedTrait for D<C> {} // OK
fn main() { }
fn main() {}

16
tests/ui/typeck/typeck-default-trait-impl-cross-crate-coherence.stderr
View file

@ -1,7 +1,7 @@
error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
--> $DIR/typeck-default-trait-impl-cross-crate-coherence.rs:14:1
--> $DIR/typeck-default-trait-impl-cross-crate-coherence.rs:13:1
|
LL | impl DefaultedTrait for (A,) { }
LL | impl DefaultedTrait for (A,) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^----
| | |
| | this is not defined in the current crate because tuples are always foreign
@ -10,9 +10,9 @@ LL | impl DefaultedTrait for (A,) { }
= note: define and implement a trait or new type instead
error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
--> $DIR/typeck-default-trait-impl-cross-crate-coherence.rs:17:1
--> $DIR/typeck-default-trait-impl-cross-crate-coherence.rs:16:1
|
LL | impl !DefaultedTrait for (B,) { }
LL | impl !DefaultedTrait for (B,) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^----
| | |
| | this is not defined in the current crate because tuples are always foreign
@ -21,15 +21,15 @@ LL | impl !DefaultedTrait for (B,) { }
= note: define and implement a trait or new type instead
error[E0321]: cross-crate traits with a default impl, like `DefaultedTrait`, can only be implemented for a struct/enum type defined in the current crate
--> $DIR/typeck-default-trait-impl-cross-crate-coherence.rs:21:1
--> $DIR/typeck-default-trait-impl-cross-crate-coherence.rs:20:1
|
LL | impl DefaultedTrait for Box<C> { }
LL | impl DefaultedTrait for Box<C> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't implement cross-crate trait for type in another crate
error[E0117]: only traits defined in the current crate can be implemented for types defined outside of the crate
--> $DIR/typeck-default-trait-impl-cross-crate-coherence.rs:22:1
--> $DIR/typeck-default-trait-impl-cross-crate-coherence.rs:21:1
|
LL | impl DefaultedTrait for lib::Something<C> { }
LL | impl DefaultedTrait for lib::Something<C> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^-----------------
| | |
| | `Something` is not defined in the current crate