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https://github.com/rust-lang/rust/commit/263edd43c5255084292329423c61a9d69715ebfa.patch
https://github.com/rust-lang/rust/issues/102155
Issue seen on native builds on riscv64 across multiple Linux
Distributions. An alternative workaround appears to be building stage 1
with debug enabled.
From 27412d1e3e128349bc515c16ce882860e20f037d Mon Sep 17 00:00:00 2001
From: 5225225 <5225225@mailbox.org>
Date: Thu, 14 Jul 2022 22:42:47 +0100
Subject: [PATCH] Use constant eval to do strict validity checks
---
Cargo.lock | 1 +
.../src/intrinsics/mod.rs | 15 +----
compiler/rustc_codegen_ssa/Cargo.toml | 1 +
compiler/rustc_codegen_ssa/src/mir/block.rs | 9 ++-
.../src/const_eval/machine.rs | 2 +-
.../src/interpret/intrinsics.rs | 56 ++++++++--------
compiler/rustc_const_eval/src/lib.rs | 6 ++
.../src/might_permit_raw_init.rs | 40 +++++++++++
compiler/rustc_middle/src/query/mod.rs | 8 +++
compiler/rustc_middle/src/ty/query.rs | 1 +
compiler/rustc_query_impl/src/keys.rs | 12 +++-
compiler/rustc_target/src/abi/mod.rs | 38 +++++------
.../intrinsics/panic-uninitialized-zeroed.rs | 66 ++++++++++++-------
13 files changed, 161 insertions(+), 94 deletions(-)
create mode 100644 compiler/rustc_const_eval/src/might_permit_raw_init.rs
diff --git a/Cargo.lock b/Cargo.lock
index 147d47044078a..dd6f0345affd0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3664,6 +3664,7 @@ dependencies = [
"rustc_arena",
"rustc_ast",
"rustc_attr",
+ "rustc_const_eval",
"rustc_data_structures",
"rustc_errors",
"rustc_fs_util",
diff --git a/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs b/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs
index eafae1cdc8af0..4b2207f375879 100644
--- a/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs
+++ b/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs
@@ -58,7 +58,6 @@ pub(crate) use llvm::codegen_llvm_intrinsic_call;
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::subst::SubstsRef;
use rustc_span::symbol::{kw, sym, Symbol};
-use rustc_target::abi::InitKind;
use crate::prelude::*;
use cranelift_codegen::ir::AtomicRmwOp;
@@ -672,12 +671,7 @@ fn codegen_regular_intrinsic_call<'tcx>(
return;
}
- if intrinsic == sym::assert_zero_valid
- && !layout.might_permit_raw_init(
- fx,
- InitKind::Zero,
- fx.tcx.sess.opts.unstable_opts.strict_init_checks) {
-
+ if intrinsic == sym::assert_zero_valid && !fx.tcx.permits_zero_init(layout) {
with_no_trimmed_paths!({
crate::base::codegen_panic(
fx,
@@ -688,12 +682,7 @@ fn codegen_regular_intrinsic_call<'tcx>(
return;
}
- if intrinsic == sym::assert_uninit_valid
- && !layout.might_permit_raw_init(
- fx,
- InitKind::Uninit,
- fx.tcx.sess.opts.unstable_opts.strict_init_checks) {
-
+ if intrinsic == sym::assert_uninit_valid && !fx.tcx.permits_uninit_init(layout) {
with_no_trimmed_paths!({
crate::base::codegen_panic(
fx,
diff --git a/compiler/rustc_codegen_ssa/Cargo.toml b/compiler/rustc_codegen_ssa/Cargo.toml
index faabea92f5a6c..81c8b9ceb136e 100644
--- a/compiler/rustc_codegen_ssa/Cargo.toml
+++ b/compiler/rustc_codegen_ssa/Cargo.toml
@@ -40,6 +40,7 @@ rustc_metadata = { path = "../rustc_metadata" }
rustc_query_system = { path = "../rustc_query_system" }
rustc_target = { path = "../rustc_target" }
rustc_session = { path = "../rustc_session" }
+rustc_const_eval = { path = "../rustc_const_eval" }
[dependencies.object]
version = "0.29.0"
diff --git a/compiler/rustc_codegen_ssa/src/mir/block.rs b/compiler/rustc_codegen_ssa/src/mir/block.rs
index 745da821c9d76..773c55cf551d5 100644
--- a/compiler/rustc_codegen_ssa/src/mir/block.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/block.rs
@@ -22,7 +22,7 @@ use rustc_span::source_map::Span;
use rustc_span::{sym, Symbol};
use rustc_symbol_mangling::typeid_for_fnabi;
use rustc_target::abi::call::{ArgAbi, FnAbi, PassMode};
-use rustc_target::abi::{self, HasDataLayout, InitKind, WrappingRange};
+use rustc_target::abi::{self, HasDataLayout, WrappingRange};
use rustc_target::spec::abi::Abi;
/// Used by `FunctionCx::codegen_terminator` for emitting common patterns
@@ -528,7 +528,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
source_info: mir::SourceInfo,
target: Option<mir::BasicBlock>,
cleanup: Option<mir::BasicBlock>,
- strict_validity: bool,
) -> bool {
// Emit a panic or a no-op for `assert_*` intrinsics.
// These are intrinsics that compile to panics so that we can get a message
@@ -547,12 +546,13 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
});
if let Some(intrinsic) = panic_intrinsic {
use AssertIntrinsic::*;
+
let ty = instance.unwrap().substs.type_at(0);
let layout = bx.layout_of(ty);
let do_panic = match intrinsic {
Inhabited => layout.abi.is_uninhabited(),
- ZeroValid => !layout.might_permit_raw_init(bx, InitKind::Zero, strict_validity),
- UninitValid => !layout.might_permit_raw_init(bx, InitKind::Uninit, strict_validity),
+ ZeroValid => !bx.tcx().permits_zero_init(layout),
+ UninitValid => !bx.tcx().permits_uninit_init(layout),
};
if do_panic {
let msg_str = with_no_visible_paths!({
@@ -687,7 +687,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
source_info,
target,
cleanup,
- self.cx.tcx().sess.opts.unstable_opts.strict_init_checks,
) {
return;
}
diff --git a/compiler/rustc_const_eval/src/const_eval/machine.rs b/compiler/rustc_const_eval/src/const_eval/machine.rs
index 29ab1d187719c..e00e667fb71e2 100644
--- a/compiler/rustc_const_eval/src/const_eval/machine.rs
+++ b/compiler/rustc_const_eval/src/const_eval/machine.rs
@@ -104,7 +104,7 @@ pub struct CompileTimeInterpreter<'mir, 'tcx> {
}
impl<'mir, 'tcx> CompileTimeInterpreter<'mir, 'tcx> {
- pub(super) fn new(const_eval_limit: Limit, can_access_statics: bool) -> Self {
+ pub(crate) fn new(const_eval_limit: Limit, can_access_statics: bool) -> Self {
CompileTimeInterpreter {
steps_remaining: const_eval_limit.0,
stack: Vec::new(),
diff --git a/compiler/rustc_const_eval/src/interpret/intrinsics.rs b/compiler/rustc_const_eval/src/interpret/intrinsics.rs
index e2a8a9891f72f..7827fb8395b7f 100644
--- a/compiler/rustc_const_eval/src/interpret/intrinsics.rs
+++ b/compiler/rustc_const_eval/src/interpret/intrinsics.rs
@@ -15,7 +15,7 @@ use rustc_middle::ty::layout::LayoutOf as _;
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::{Ty, TyCtxt};
use rustc_span::symbol::{sym, Symbol};
-use rustc_target::abi::{Abi, Align, InitKind, Primitive, Size};
+use rustc_target::abi::{Abi, Align, Primitive, Size};
use super::{
util::ensure_monomorphic_enough, CheckInAllocMsg, ImmTy, InterpCx, Machine, OpTy, PlaceTy,
@@ -413,35 +413,33 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
),
)?;
}
- if intrinsic_name == sym::assert_zero_valid
- && !layout.might_permit_raw_init(
- self,
- InitKind::Zero,
- self.tcx.sess.opts.unstable_opts.strict_init_checks,
- )
- {
- M::abort(
- self,
- format!(
- "aborted execution: attempted to zero-initialize type `{}`, which is invalid",
- ty
- ),
- )?;
+
+ if intrinsic_name == sym::assert_zero_valid {
+ let should_panic = !self.tcx.permits_zero_init(layout);
+
+ if should_panic {
+ M::abort(
+ self,
+ format!(
+ "aborted execution: attempted to zero-initialize type `{}`, which is invalid",
+ ty
+ ),
+ )?;
+ }
}
- if intrinsic_name == sym::assert_uninit_valid
- && !layout.might_permit_raw_init(
- self,
- InitKind::Uninit,
- self.tcx.sess.opts.unstable_opts.strict_init_checks,
- )
- {
- M::abort(
- self,
- format!(
- "aborted execution: attempted to leave type `{}` uninitialized, which is invalid",
- ty
- ),
- )?;
+
+ if intrinsic_name == sym::assert_uninit_valid {
+ let should_panic = !self.tcx.permits_uninit_init(layout);
+
+ if should_panic {
+ M::abort(
+ self,
+ format!(
+ "aborted execution: attempted to leave type `{}` uninitialized, which is invalid",
+ ty
+ ),
+ )?;
+ }
}
}
sym::simd_insert => {
diff --git a/compiler/rustc_const_eval/src/lib.rs b/compiler/rustc_const_eval/src/lib.rs
index d65d4f7eb720e..72ac6af685dc4 100644
--- a/compiler/rustc_const_eval/src/lib.rs
+++ b/compiler/rustc_const_eval/src/lib.rs
@@ -33,11 +33,13 @@ extern crate rustc_middle;
pub mod const_eval;
mod errors;
pub mod interpret;
+mod might_permit_raw_init;
pub mod transform;
pub mod util;
use rustc_middle::ty;
use rustc_middle::ty::query::Providers;
+use rustc_target::abi::InitKind;
pub fn provide(providers: &mut Providers) {
const_eval::provide(providers);
@@ -59,4 +61,8 @@ pub fn provide(providers: &mut Providers) {
let (param_env, value) = param_env_and_value.into_parts();
const_eval::deref_mir_constant(tcx, param_env, value)
};
+ providers.permits_uninit_init =
+ |tcx, ty| might_permit_raw_init::might_permit_raw_init(tcx, ty, InitKind::Uninit);
+ providers.permits_zero_init =
+ |tcx, ty| might_permit_raw_init::might_permit_raw_init(tcx, ty, InitKind::Zero);
}
diff --git a/compiler/rustc_const_eval/src/might_permit_raw_init.rs b/compiler/rustc_const_eval/src/might_permit_raw_init.rs
new file mode 100644
index 0000000000000..f971c2238c7bb
--- /dev/null
+++ b/compiler/rustc_const_eval/src/might_permit_raw_init.rs
@@ -0,0 +1,40 @@
+use crate::const_eval::CompileTimeInterpreter;
+use crate::interpret::{InterpCx, MemoryKind, OpTy};
+use rustc_middle::ty::layout::LayoutCx;
+use rustc_middle::ty::{layout::TyAndLayout, ParamEnv, TyCtxt};
+use rustc_session::Limit;
+use rustc_target::abi::InitKind;
+
+pub fn might_permit_raw_init<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ ty: TyAndLayout<'tcx>,
+ kind: InitKind,
+) -> bool {
+ let strict = tcx.sess.opts.unstable_opts.strict_init_checks;
+
+ if strict {
+ let machine = CompileTimeInterpreter::new(Limit::new(0), false);
+
+ let mut cx = InterpCx::new(tcx, rustc_span::DUMMY_SP, ParamEnv::reveal_all(), machine);
+
+ let allocated = cx
+ .allocate(ty, MemoryKind::Machine(crate::const_eval::MemoryKind::Heap))
+ .expect("OOM: failed to allocate for uninit check");
+
+ if kind == InitKind::Zero {
+ cx.write_bytes_ptr(
+ allocated.ptr,
+ std::iter::repeat(0_u8).take(ty.layout.size().bytes_usize()),
+ )
+ .expect("failed to write bytes for zero valid check");
+ }
+
+ let ot: OpTy<'_, _> = allocated.into();
+
+ // Assume that if it failed, it's a validation failure.
+ cx.validate_operand(&ot).is_ok()
+ } else {
+ let layout_cx = LayoutCx { tcx, param_env: ParamEnv::reveal_all() };
+ ty.might_permit_raw_init(&layout_cx, kind)
+ }
+}
diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index bdae7e5fcd6b1..0581ef41f66c2 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -2053,4 +2053,12 @@ rustc_queries! {
desc { |tcx| "looking up generator diagnostic data of `{}`", tcx.def_path_str(key) }
separate_provide_extern
}
+
+ query permits_uninit_init(key: TyAndLayout<'tcx>) -> bool {
+ desc { "checking to see if {:?} permits being left uninit", key.ty }
+ }
+
+ query permits_zero_init(key: TyAndLayout<'tcx>) -> bool {
+ desc { "checking to see if {:?} permits being left zeroed", key.ty }
+ }
}
diff --git a/compiler/rustc_middle/src/ty/query.rs b/compiler/rustc_middle/src/ty/query.rs
index 3d662ed5de4ba..2452bcf6a61b8 100644
--- a/compiler/rustc_middle/src/ty/query.rs
+++ b/compiler/rustc_middle/src/ty/query.rs
@@ -28,6 +28,7 @@ use crate::traits::query::{
use crate::traits::specialization_graph;
use crate::traits::{self, ImplSource};
use crate::ty::fast_reject::SimplifiedType;
+use crate::ty::layout::TyAndLayout;
use crate::ty::subst::{GenericArg, SubstsRef};
use crate::ty::util::AlwaysRequiresDrop;
use crate::ty::GeneratorDiagnosticData;
diff --git a/compiler/rustc_query_impl/src/keys.rs b/compiler/rustc_query_impl/src/keys.rs
index 6fbafeb1d32b3..5477431431374 100644
--- a/compiler/rustc_query_impl/src/keys.rs
+++ b/compiler/rustc_query_impl/src/keys.rs
@@ -6,7 +6,7 @@ use rustc_middle::mir;
use rustc_middle::traits;
use rustc_middle::ty::fast_reject::SimplifiedType;
use rustc_middle::ty::subst::{GenericArg, SubstsRef};
-use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_middle::ty::{self, layout::TyAndLayout, Ty, TyCtxt};
use rustc_span::symbol::{Ident, Symbol};
use rustc_span::{Span, DUMMY_SP};
@@ -385,6 +385,16 @@ impl<'tcx> Key for Ty<'tcx> {
}
}
+impl<'tcx> Key for TyAndLayout<'tcx> {
+ #[inline(always)]
+ fn query_crate_is_local(&self) -> bool {
+ true
+ }
+ fn default_span(&self, _: TyCtxt<'_>) -> Span {
+ DUMMY_SP
+ }
+}
+
impl<'tcx> Key for (Ty<'tcx>, Ty<'tcx>) {
#[inline(always)]
fn query_crate_is_local(&self) -> bool {
diff --git a/compiler/rustc_target/src/abi/mod.rs b/compiler/rustc_target/src/abi/mod.rs
index d1eafd6ac5fb8..6f4d073d70486 100644
--- a/compiler/rustc_target/src/abi/mod.rs
+++ b/compiler/rustc_target/src/abi/mod.rs
@@ -1372,7 +1372,7 @@ pub struct PointeeInfo {
/// Used in `might_permit_raw_init` to indicate the kind of initialisation
/// that is checked to be valid
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum InitKind {
Zero,
Uninit,
@@ -1487,14 +1487,18 @@ impl<'a, Ty> TyAndLayout<'a, Ty> {
///
/// `init_kind` indicates if the memory is zero-initialized or left uninitialized.
///
- /// `strict` is an opt-in debugging flag added in #97323 that enables more checks.
+ /// This code is intentionally conservative, and will not detect
+ /// * zero init of an enum whose 0 variant does not allow zero initialization
+ /// * making uninitialized types who have a full valid range (ints, floats, raw pointers)
+ /// * Any form of invalid value being made inside an array (unless the value is uninhabited)
///
- /// This is conservative: in doubt, it will answer `true`.
+ /// A strict form of these checks that uses const evaluation exists in
+ /// `rustc_const_eval::might_permit_raw_init`, and a tracking issue for making these checks
+ /// stricter is <https://github.com/rust-lang/rust/issues/66151>.
///
- /// FIXME: Once we removed all the conservatism, we could alternatively
- /// create an all-0/all-undef constant and run the const value validator to see if
- /// this is a valid value for the given type.
- pub fn might_permit_raw_init<C>(self, cx: &C, init_kind: InitKind, strict: bool) -> bool
+ /// FIXME: Once all the conservatism is removed from here, and the checks are ran by default,
+ /// we can use the const evaluation checks always instead.
+ pub fn might_permit_raw_init<C>(self, cx: &C, init_kind: InitKind) -> bool
where
Self: Copy,
Ty: TyAbiInterface<'a, C>,
@@ -1507,13 +1511,8 @@ impl<'a, Ty> TyAndLayout<'a, Ty> {
s.valid_range(cx).contains(0)
}
InitKind::Uninit => {
- if strict {
- // The type must be allowed to be uninit (which means "is a union").
- s.is_uninit_valid()
- } else {
- // The range must include all values.
- s.is_always_valid(cx)
- }
+ // The range must include all values.
+ s.is_always_valid(cx)
}
}
};
@@ -1534,19 +1533,12 @@ impl<'a, Ty> TyAndLayout<'a, Ty> {
// If we have not found an error yet, we need to recursively descend into fields.
match &self.fields {
FieldsShape::Primitive | FieldsShape::Union { .. } => {}
- FieldsShape::Array { count, .. } => {
+ FieldsShape::Array { .. } => {
// FIXME(#66151): For now, we are conservative and do not check arrays by default.
- if strict
- && *count > 0
- && !self.field(cx, 0).might_permit_raw_init(cx, init_kind, strict)
- {
- // Found non empty array with a type that is unhappy about this kind of initialization
- return false;
- }
}
FieldsShape::Arbitrary { offsets, .. } => {
for idx in 0..offsets.len() {
- if !self.field(cx, idx).might_permit_raw_init(cx, init_kind, strict) {
+ if !self.field(cx, idx).might_permit_raw_init(cx, init_kind) {
// We found a field that is unhappy with this kind of initialization.
return false;
}
diff --git a/src/test/ui/intrinsics/panic-uninitialized-zeroed.rs b/src/test/ui/intrinsics/panic-uninitialized-zeroed.rs
index 3ffd35ecdb8da..255151a96032c 100644
--- a/src/test/ui/intrinsics/panic-uninitialized-zeroed.rs
+++ b/src/test/ui/intrinsics/panic-uninitialized-zeroed.rs
@@ -57,6 +57,13 @@ enum LR_NonZero {
struct ZeroSized;
+#[allow(dead_code)]
+#[repr(i32)]
+enum ZeroIsValid {
+ Zero(u8) = 0,
+ One(NonNull<()>) = 1,
+}
+
fn test_panic_msg<T>(op: impl (FnOnce() -> T) + panic::UnwindSafe, msg: &str) {
let err = panic::catch_unwind(op).err();
assert_eq!(
@@ -152,33 +159,12 @@ fn main() {
"attempted to zero-initialize type `*const dyn core::marker::Send`, which is invalid"
);
- /* FIXME(#66151) we conservatively do not error here yet.
- test_panic_msg(
- || mem::uninitialized::<LR_NonZero>(),
- "attempted to leave type `LR_NonZero` uninitialized, which is invalid"
- );
- test_panic_msg(
- || mem::zeroed::<LR_NonZero>(),
- "attempted to zero-initialize type `LR_NonZero`, which is invalid"
- );
-
- test_panic_msg(
- || mem::uninitialized::<ManuallyDrop<LR_NonZero>>(),
- "attempted to leave type `std::mem::ManuallyDrop<LR_NonZero>` uninitialized, \
- which is invalid"
- );
- test_panic_msg(
- || mem::zeroed::<ManuallyDrop<LR_NonZero>>(),
- "attempted to zero-initialize type `std::mem::ManuallyDrop<LR_NonZero>`, \
- which is invalid"
- );
- */
-
test_panic_msg(
|| mem::uninitialized::<(NonNull<u32>, u32, u32)>(),
"attempted to leave type `(core::ptr::non_null::NonNull<u32>, u32, u32)` uninitialized, \
which is invalid"
);
+
test_panic_msg(
|| mem::zeroed::<(NonNull<u32>, u32, u32)>(),
"attempted to zero-initialize type `(core::ptr::non_null::NonNull<u32>, u32, u32)`, \
@@ -196,11 +182,23 @@ fn main() {
which is invalid"
);
+ test_panic_msg(
+ || mem::uninitialized::<LR_NonZero>(),
+ "attempted to leave type `LR_NonZero` uninitialized, which is invalid"
+ );
+
+ test_panic_msg(
+ || mem::uninitialized::<ManuallyDrop<LR_NonZero>>(),
+ "attempted to leave type `core::mem::manually_drop::ManuallyDrop<LR_NonZero>` uninitialized, \
+ which is invalid"
+ );
+
test_panic_msg(
|| mem::uninitialized::<NoNullVariant>(),
"attempted to leave type `NoNullVariant` uninitialized, \
which is invalid"
);
+
test_panic_msg(
|| mem::zeroed::<NoNullVariant>(),
"attempted to zero-initialize type `NoNullVariant`, \
@@ -212,10 +210,12 @@ fn main() {
|| mem::uninitialized::<bool>(),
"attempted to leave type `bool` uninitialized, which is invalid"
);
+
test_panic_msg(
|| mem::uninitialized::<LR>(),
"attempted to leave type `LR` uninitialized, which is invalid"
);
+
test_panic_msg(
|| mem::uninitialized::<ManuallyDrop<LR>>(),
"attempted to leave type `core::mem::manually_drop::ManuallyDrop<LR>` uninitialized, which is invalid"
@@ -229,6 +229,7 @@ fn main() {
let _val = mem::zeroed::<Option<&'static i32>>();
let _val = mem::zeroed::<MaybeUninit<NonNull<u32>>>();
let _val = mem::zeroed::<[!; 0]>();
+ let _val = mem::zeroed::<ZeroIsValid>();
let _val = mem::uninitialized::<MaybeUninit<bool>>();
let _val = mem::uninitialized::<[!; 0]>();
let _val = mem::uninitialized::<()>();
@@ -259,12 +260,33 @@ fn main() {
|| mem::zeroed::<[NonNull<()>; 1]>(),
"attempted to zero-initialize type `[core::ptr::non_null::NonNull<()>; 1]`, which is invalid"
);
+
+ // FIXME(#66151) we conservatively do not error here yet (by default).
+ test_panic_msg(
+ || mem::zeroed::<LR_NonZero>(),
+ "attempted to zero-initialize type `LR_NonZero`, which is invalid"
+ );
+
+ test_panic_msg(
+ || mem::zeroed::<ManuallyDrop<LR_NonZero>>(),
+ "attempted to zero-initialize type `core::mem::manually_drop::ManuallyDrop<LR_NonZero>`, \
+ which is invalid"
+ );
} else {
// These are UB because they have not been officially blessed, but we await the resolution
// of <https://github.com/rust-lang/unsafe-code-guidelines/issues/71> before doing
// anything about that.
let _val = mem::uninitialized::<i32>();
let _val = mem::uninitialized::<*const ()>();
+
+ // These are UB, but best to test them to ensure we don't become unintentionally
+ // stricter.
+
+ // It's currently unchecked to create invalid enums and values inside arrays.
+ let _val = mem::zeroed::<LR_NonZero>();
+ let _val = mem::zeroed::<[LR_NonZero; 1]>();
+ let _val = mem::zeroed::<[NonNull<()>; 1]>();
+ let _val = mem::uninitialized::<[NonNull<()>; 1]>();
}
}
}
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