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Check drop is trivial before checking ty needs drop

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This commit is contained in:
Michael Goulet 2024-11-21 23:20:59 +00:00
parent af0d566e76
commit 69a38de977
12 changed files with 57 additions and 180 deletions
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7
compiler/rustc_const_eval/src/check_consts/qualifs.rs
View File

@ -175,6 +175,11 @@ impl Qualif for NeedsNonConstDrop {
return false;
}
// If this doesn't need drop at all, then don't select `~const Destruct`.
if !ty.needs_drop(cx.tcx, cx.typing_env) {
return false;
}
// We check that the type is `~const Destruct` since that will verify that
// the type is both `~const Drop` (if a drop impl exists for the adt), *and*
// that the components of this type are also `~const Destruct`. This
@ -203,7 +208,7 @@ impl Qualif for NeedsNonConstDrop {
// in its value since:
// 1. The destructor may have `~const` bounds which are not present on the type.
// Someone needs to check that those are satisfied.
// While this could be done instead satisfied by checking that the `~const Drop`
// While this could be instead satisfied by checking that the `~const Drop`
// impl holds (i.e. replicating part of the `in_any_value_of_ty` logic above),
// even in this case, we have another problem, which is,
// 2. The destructor may *modify* the operand being dropped, so even if we

2
compiler/rustc_feature/src/unstable.rs
View File

@ -426,7 +426,7 @@ declare_features! (
(unstable, const_async_blocks, "1.53.0", Some(85368)),
/// Allows `const || {}` closures in const contexts.
(incomplete, const_closures, "1.68.0", Some(106003)),
/// Uwu
/// Allows using `~const Destruct` bounds and calling drop impls in const contexts.
(unstable, const_destruct, "CURRENT_RUSTC_VERSION", Some(133214)),
/// Allows `for _ in _` loops in const contexts.
(unstable, const_for, "1.56.0", Some(87575)),

5
compiler/rustc_middle/src/ty/context.rs
View File

@ -4,7 +4,7 @@
pub mod tls;
use std::assert_matches::assert_matches;
use std::assert_matches::{assert_matches, debug_assert_matches};
use std::borrow::Borrow;
use std::cmp::Ordering;
use std::hash::{Hash, Hasher};
@ -377,14 +377,17 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
}
fn impl_is_const(self, def_id: DefId) -> bool {
debug_assert_matches!(self.def_kind(def_id), DefKind::Impl { of_trait: true });
self.is_conditionally_const(def_id)
}
fn fn_is_const(self, def_id: DefId) -> bool {
debug_assert_matches!(self.def_kind(def_id), DefKind::Fn | DefKind::AssocFn);
self.is_conditionally_const(def_id)
}
fn alias_has_const_conditions(self, def_id: DefId) -> bool {
debug_assert_matches!(self.def_kind(def_id), DefKind::AssocTy | DefKind::OpaqueTy);
self.is_conditionally_const(def_id)
}

2
tests/ui/consts/const-block-const-bound.rs
View File

@ -1,7 +1,7 @@
//@ known-bug: #103507
#![allow(unused)]
#![feature(const_trait_impl, negative_impls)]
#![feature(const_trait_impl, negative_impls, const_destruct)]
use std::marker::Destruct;

25
tests/ui/consts/const-block-const-bound.stderr
View File

@ -1,23 +1,3 @@
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/const-block-const-bound.rs:6:5
|
LL | use std::marker::Destruct;
| ^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/const-block-const-bound.rs:8:22
|
LL | const fn f<T: ~const Destruct>(x: T) {}
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/const-block-const-bound.rs:8:15
|
@ -40,7 +20,6 @@ LL | const fn f<T: ~const Destruct>(x: T) {}
| |
| the destructor for this type cannot be evaluated in constant functions
error: aborting due to 5 previous errors
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0493, E0658.
For more information about an error, try `rustc --explain E0493`.
For more information about this error, try `rustc --explain E0493`.

1
tests/ui/consts/fn_trait_refs.rs
View File

@ -5,6 +5,7 @@
#![feature(unboxed_closures)]
#![feature(const_trait_impl)]
#![feature(const_cmp)]
#![feature(const_destruct)]
use std::marker::Destruct;

118
tests/ui/consts/fn_trait_refs.stderr
View File

@ -1,53 +1,3 @@
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/fn_trait_refs.rs:9:5
|
LL | use std::marker::Destruct;
| ^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/fn_trait_refs.rs:13:31
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/fn_trait_refs.rs:20:34
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/fn_trait_refs.rs:34:31
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/fn_trait_refs.rs:48:34
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0635]: unknown feature `const_fn_trait_ref_impls`
--> $DIR/fn_trait_refs.rs:3:12
|
@ -61,19 +11,19 @@ LL | #![feature(const_cmp)]
| ^^^^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:13:8
--> $DIR/fn_trait_refs.rs:14:8
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:13:24
--> $DIR/fn_trait_refs.rs:14:24
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:13:8
--> $DIR/fn_trait_refs.rs:14:8
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
@ -81,7 +31,7 @@ LL | T: ~const Fn<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:13:8
--> $DIR/fn_trait_refs.rs:14:8
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
@ -89,7 +39,7 @@ LL | T: ~const Fn<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:13:24
--> $DIR/fn_trait_refs.rs:14:24
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
@ -97,19 +47,19 @@ LL | T: ~const Fn<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:20:8
--> $DIR/fn_trait_refs.rs:21:8
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:20:27
--> $DIR/fn_trait_refs.rs:21:27
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:20:8
--> $DIR/fn_trait_refs.rs:21:8
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
@ -117,7 +67,7 @@ LL | T: ~const FnMut<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:20:8
--> $DIR/fn_trait_refs.rs:21:8
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
@ -125,7 +75,7 @@ LL | T: ~const FnMut<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:20:27
--> $DIR/fn_trait_refs.rs:21:27
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
@ -133,13 +83,13 @@ LL | T: ~const FnMut<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:27:8
--> $DIR/fn_trait_refs.rs:28:8
|
LL | T: ~const FnOnce<()>,
| ^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:27:8
--> $DIR/fn_trait_refs.rs:28:8
|
LL | T: ~const FnOnce<()>,
| ^^^^^^
@ -147,7 +97,7 @@ LL | T: ~const FnOnce<()>,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:27:8
--> $DIR/fn_trait_refs.rs:28:8
|
LL | T: ~const FnOnce<()>,
| ^^^^^^
@ -155,19 +105,19 @@ LL | T: ~const FnOnce<()>,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:34:8
--> $DIR/fn_trait_refs.rs:35:8
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:34:24
--> $DIR/fn_trait_refs.rs:35:24
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:34:8
--> $DIR/fn_trait_refs.rs:35:8
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
@ -175,7 +125,7 @@ LL | T: ~const Fn<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:34:8
--> $DIR/fn_trait_refs.rs:35:8
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
@ -183,7 +133,7 @@ LL | T: ~const Fn<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:34:24
--> $DIR/fn_trait_refs.rs:35:24
|
LL | T: ~const Fn<()> + ~const Destruct,
| ^^^^^^
@ -191,19 +141,19 @@ LL | T: ~const Fn<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:48:8
--> $DIR/fn_trait_refs.rs:49:8
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:48:27
--> $DIR/fn_trait_refs.rs:49:27
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:48:8
--> $DIR/fn_trait_refs.rs:49:8
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
@ -211,7 +161,7 @@ LL | T: ~const FnMut<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:48:8
--> $DIR/fn_trait_refs.rs:49:8
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
@ -219,7 +169,7 @@ LL | T: ~const FnMut<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/fn_trait_refs.rs:48:27
--> $DIR/fn_trait_refs.rs:49:27
|
LL | T: ~const FnMut<()> + ~const Destruct,
| ^^^^^^
@ -227,7 +177,7 @@ LL | T: ~const FnMut<()> + ~const Destruct,
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error[E0015]: cannot call non-const operator in constants
--> $DIR/fn_trait_refs.rs:70:17
--> $DIR/fn_trait_refs.rs:71:17
|
LL | assert!(test_one == (1, 1, 1));
| ^^^^^^^^^^^^^^^^^^^^^
@ -235,7 +185,7 @@ LL | assert!(test_one == (1, 1, 1));
= note: calls in constants are limited to constant functions, tuple structs and tuple variants
error[E0015]: cannot call non-const operator in constants
--> $DIR/fn_trait_refs.rs:73:17
--> $DIR/fn_trait_refs.rs:74:17
|
LL | assert!(test_two == (2, 2));
| ^^^^^^^^^^^^^^^^^^
@ -243,7 +193,7 @@ LL | assert!(test_two == (2, 2));
= note: calls in constants are limited to constant functions, tuple structs and tuple variants
error[E0015]: cannot call non-const closure in constant functions
--> $DIR/fn_trait_refs.rs:15:5
--> $DIR/fn_trait_refs.rs:16:5
|
LL | f()
| ^^^
@ -255,7 +205,7 @@ LL | T: ~const Fn<()> + ~const Destruct + ~const Fn(),
| +++++++++++++
error[E0493]: destructor of `T` cannot be evaluated at compile-time
--> $DIR/fn_trait_refs.rs:11:23
--> $DIR/fn_trait_refs.rs:12:23
|
LL | const fn tester_fn<T>(f: T) -> T::Output
| ^ the destructor for this type cannot be evaluated in constant functions
@ -264,7 +214,7 @@ LL | }
| - value is dropped here
error[E0015]: cannot call non-const closure in constant functions
--> $DIR/fn_trait_refs.rs:22:5
--> $DIR/fn_trait_refs.rs:23:5
|
LL | f()
| ^^^
@ -276,7 +226,7 @@ LL | T: ~const FnMut<()> + ~const Destruct + ~const FnMut(),
| ++++++++++++++++
error[E0493]: destructor of `T` cannot be evaluated at compile-time
--> $DIR/fn_trait_refs.rs:18:27
--> $DIR/fn_trait_refs.rs:19:27
|
LL | const fn tester_fn_mut<T>(mut f: T) -> T::Output
| ^^^^^ the destructor for this type cannot be evaluated in constant functions
@ -285,7 +235,7 @@ LL | }
| - value is dropped here
error[E0015]: cannot call non-const closure in constant functions
--> $DIR/fn_trait_refs.rs:29:5
--> $DIR/fn_trait_refs.rs:30:5
|
LL | f()
| ^^^
@ -297,7 +247,7 @@ LL | T: ~const FnOnce<()> + ~const FnOnce(),
| +++++++++++++++++
error[E0493]: destructor of `T` cannot be evaluated at compile-time
--> $DIR/fn_trait_refs.rs:32:21
--> $DIR/fn_trait_refs.rs:33:21
|
LL | const fn test_fn<T>(mut f: T) -> (T::Output, T::Output, T::Output)
| ^^^^^ the destructor for this type cannot be evaluated in constant functions
@ -306,7 +256,7 @@ LL | }
| - value is dropped here
error[E0493]: destructor of `T` cannot be evaluated at compile-time
--> $DIR/fn_trait_refs.rs:46:25
--> $DIR/fn_trait_refs.rs:47:25
|
LL | const fn test_fn_mut<T>(mut f: T) -> (T::Output, T::Output)
| ^^^^^ the destructor for this type cannot be evaluated in constant functions
@ -314,7 +264,7 @@ LL | const fn test_fn_mut<T>(mut f: T) -> (T::Output, T::Output)
LL | }
| - value is dropped here
error: aborting due to 39 previous errors
error: aborting due to 34 previous errors
Some errors have detailed explanations: E0015, E0493, E0635, E0658.
Some errors have detailed explanations: E0015, E0493, E0635.
For more information about an error, try `rustc --explain E0015`.

2
tests/ui/traits/const-traits/const-drop-bound.rs
View File

@ -2,7 +2,7 @@
// FIXME check-pass
#![feature(const_trait_impl)]
#![feature(const_precise_live_drops)]
#![feature(const_precise_live_drops, const_destruct)]
use std::marker::Destruct;

45
tests/ui/traits/const-traits/const-drop-bound.stderr
View File

@ -1,43 +1,3 @@
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/const-drop-bound.rs:7:5
|
LL | use std::marker::Destruct;
| ^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/const-drop-bound.rs:9:68
|
LL | const fn foo<T, E>(res: Result<T, E>) -> Option<T> where E: ~const Destruct {
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/const-drop-bound.rs:20:15
|
LL | T: ~const Destruct,
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/const-drop-bound.rs:21:15
|
LL | E: ~const Destruct,
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error: `~const` can only be applied to `#[const_trait]` traits
--> $DIR/const-drop-bound.rs:9:61
|
@ -88,7 +48,6 @@ LL | Err(_e) => None,
| |
| the destructor for this type cannot be evaluated in constant functions
error: aborting due to 11 previous errors
error: aborting due to 7 previous errors
Some errors have detailed explanations: E0493, E0658.
For more information about an error, try `rustc --explain E0493`.
For more information about this error, try `rustc --explain E0493`.

2
tests/ui/traits/const-traits/const-drop-fail-2.rs
View File

@ -1,5 +1,5 @@
//@ known-bug: #110395
#![feature(const_trait_impl)]
#![feature(const_trait_impl, const_destruct)]
// #![cfg_attr(precise, feature(const_precise_live_drops))]
use std::marker::{Destruct, PhantomData};

24
tests/ui/traits/const-traits/const-drop-fail-2.stderr
View File

@ -1,23 +1,3 @@
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/const-drop-fail-2.rs:5:19
|
LL | use std::marker::{Destruct, PhantomData};
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0658]: use of unstable library feature `const_destruct`
--> $DIR/const-drop-fail-2.rs:20:26
|
LL | const fn check<T: ~const Destruct>(_: T) {}
| ^^^^^^^^
|
= note: see issue #133214 <https://github.com/rust-lang/rust/issues/133214> for more information
= help: add `#![feature(const_destruct)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error: const `impl` for trait `Drop` which is not marked with `#[const_trait]`
--> $DIR/const-drop-fail-2.rs:39:25
|
@ -55,7 +35,7 @@ LL | const fn check<T: ~const Destruct>(_: T) {}
| |
| the destructor for this type cannot be evaluated in constant functions
error: aborting due to 7 previous errors
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0277, E0493, E0658.
Some errors have detailed explanations: E0277, E0493.
For more information about an error, try `rustc --explain E0277`.

4
tests/ui/traits/const-traits/effects/auxiliary/minicore.rs
View File

@ -12,7 +12,7 @@
fundamental,
marker_trait_attr,
const_trait_impl,
const_destruct,
const_destruct
)]
#![allow(internal_features, incomplete_features)]
#![no_std]
@ -450,7 +450,7 @@ pub trait Clone: Sized {
fn clone(&self) -> Self;
fn clone_from(&mut self, source: &Self)
where
Self: ~const Destruct,
Self: ~const Destruct,
{
*self = source.clone()
}