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This commit is contained in:
b-naber 2022-06-07 19:29:13 +02:00
parent 8093db6e2b
commit 060acc97db
10 changed files with 118 additions and 44 deletions
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3
compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
View file

@ -703,7 +703,8 @@ fn push_const_param<'tcx>(tcx: TyCtxt<'tcx>, ct: ty::Const<'tcx>, output: &mut S
// but we get a deterministic, virtually unique value for the constant. // but we get a deterministic, virtually unique value for the constant.
let hcx = &mut tcx.create_stable_hashing_context(); let hcx = &mut tcx.create_stable_hashing_context();
let mut hasher = StableHasher::new(); let mut hasher = StableHasher::new();
hcx.while_hashing_spans(false, |hcx| ct.kind().hash_stable(hcx, &mut hasher)); let ct = ct.eval(tcx, ty::ParamEnv::reveal_all());
hcx.while_hashing_spans(false, |hcx| ct.to_valtree().hash_stable(hcx, &mut hasher));
// Let's only emit 64 bits of the hash value. That should be plenty for // Let's only emit 64 bits of the hash value. That should be plenty for
// avoiding collisions and will make the emitted type names shorter. // avoiding collisions and will make the emitted type names shorter.
let hash: u64 = hasher.finish(); let hash: u64 = hasher.finish();

2
compiler/rustc_middle/src/ty/mod.rs
View file

@ -42,8 +42,8 @@ use rustc_query_system::ich::StableHashingContext;
use rustc_session::cstore::CrateStoreDyn; use rustc_session::cstore::CrateStoreDyn;
use rustc_span::symbol::{kw, sym, Ident, Symbol}; use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::Span; use rustc_span::Span;
pub use subst::*;
use rustc_target::abi::{Align, VariantIdx}; use rustc_target::abi::{Align, VariantIdx};
pub use subst::*;
pub use vtable::*; pub use vtable::*;
use std::fmt::Debug; use std::fmt::Debug;

3
compiler/rustc_mir_build/src/build/mod.rs
View file

@ -3,8 +3,9 @@ pub(crate) use crate::build::expr::as_constant::lit_to_mir_constant;
use crate::build::expr::as_place::PlaceBuilder; use crate::build::expr::as_place::PlaceBuilder;
use crate::build::scope::DropKind; use crate::build::scope::DropKind;
use crate::thir::pattern::pat_from_hir; use crate::thir::pattern::pat_from_hir;
use rustc_data_structures::fx::FxHashMap;
use rustc_apfloat::ieee::{Double, Single}; use rustc_apfloat::ieee::{Double, Single};
use rustc_apfloat::Float;
use rustc_data_structures::fx::FxHashMap;
use rustc_errors::ErrorGuaranteed; use rustc_errors::ErrorGuaranteed;
use rustc_hir as hir; use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId}; use rustc_hir::def_id::{DefId, LocalDefId};

6
src/test/ui/associated-consts/defaults-cyclic-fail.stderr
View file

@ -11,10 +11,10 @@ LL | const B: u8 = Self::A;
| ^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^
= note: ...which again requires const-evaluating + checking `Tr::A`, completing the cycle = note: ...which again requires const-evaluating + checking `Tr::A`, completing the cycle
note: cycle used when const-evaluating + checking `main::promoted[1]` note: cycle used when const-evaluating + checking `main::promoted[1]`
--> $DIR/defaults-cyclic-fail.rs:14:1 --> $DIR/defaults-cyclic-fail.rs:16:16
| |
LL | fn main() { LL | assert_eq!(<() as Tr>::A, 0);
| ^^^^^^^^^ | ^^^^^^^^^^^^^
error: aborting due to previous error error: aborting due to previous error

4
src/test/ui/associated-consts/issue-24949-assoc-const-static-recursion-impl.stderr
View file

@ -1,8 +1,8 @@
error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-24949-assoc-const-static-recursion-impl.rs:11:1: 13:2>::BAR` error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-24949-assoc-const-static-recursion-impl.rs:11:1: 13:2>::BAR`
--> $DIR/issue-24949-assoc-const-static-recursion-impl.rs:12:5 --> $DIR/issue-24949-assoc-const-static-recursion-impl.rs:12:22
| |
LL | const BAR: u32 = IMPL_REF_BAR; LL | const BAR: u32 = IMPL_REF_BAR;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^
| |
note: ...which requires const-evaluating + checking `IMPL_REF_BAR`... note: ...which requires const-evaluating + checking `IMPL_REF_BAR`...
--> $DIR/issue-24949-assoc-const-static-recursion-impl.rs:7:1 --> $DIR/issue-24949-assoc-const-static-recursion-impl.rs:7:1

4
src/test/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait-default.stderr
View file

@ -1,8 +1,8 @@
error[E0391]: cycle detected when elaborating drops for `FooDefault::BAR` error[E0391]: cycle detected when elaborating drops for `FooDefault::BAR`
--> $DIR/issue-24949-assoc-const-static-recursion-trait-default.rs:8:5 --> $DIR/issue-24949-assoc-const-static-recursion-trait-default.rs:8:22
| |
LL | const BAR: u32 = DEFAULT_REF_BAR; LL | const BAR: u32 = DEFAULT_REF_BAR;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^
| |
note: ...which requires const-evaluating + checking `DEFAULT_REF_BAR`... note: ...which requires const-evaluating + checking `DEFAULT_REF_BAR`...
--> $DIR/issue-24949-assoc-const-static-recursion-trait-default.rs:11:1 --> $DIR/issue-24949-assoc-const-static-recursion-trait-default.rs:11:1

4
src/test/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait.stderr
View file

@ -1,8 +1,8 @@
error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-24949-assoc-const-static-recursion-trait.rs:11:1: 13:2>::BAR` error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-24949-assoc-const-static-recursion-trait.rs:11:1: 13:2>::BAR`
--> $DIR/issue-24949-assoc-const-static-recursion-trait.rs:12:5 --> $DIR/issue-24949-assoc-const-static-recursion-trait.rs:12:22
| |
LL | const BAR: u32 = TRAIT_REF_BAR; LL | const BAR: u32 = TRAIT_REF_BAR;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
| |
note: ...which requires const-evaluating + checking `TRAIT_REF_BAR`... note: ...which requires const-evaluating + checking `TRAIT_REF_BAR`...
--> $DIR/issue-24949-assoc-const-static-recursion-trait.rs:7:1 --> $DIR/issue-24949-assoc-const-static-recursion-trait.rs:7:1

65
src/test/ui/consts/const-eval/ub-wide-ptr.32bit.stderr
View file

@ -149,8 +149,19 @@ LL | const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
╾─allocN─╼ │ ╾──╼ ╾─allocN─╼ │ ╾──╼
} }
error: any use of this value will cause an error
--> $DIR/ub-wide-ptr.rs:87:40
|
LL | const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
| ---------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| |
| referenced constant has errors
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:93:1 --> $DIR/ub-wide-ptr.rs:95:1
| |
LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]); LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.0: encountered 0x03, but expected a boolean | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.0: encountered 0x03, but expected a boolean
@ -160,8 +171,19 @@ LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3
╾allocN─╼ │ ╾──╼ ╾allocN─╼ │ ╾──╼
} }
error: any use of this value will cause an error
--> $DIR/ub-wide-ptr.rs:95:42
|
LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]);
| -----------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| |
| referenced constant has errors
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:96:1 --> $DIR/ub-wide-ptr.rs:100:1
| |
LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]); LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.1[0]: encountered 0x03, but expected a boolean | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.1[0]: encountered 0x03, but expected a boolean
@ -171,8 +193,19 @@ LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::tran
╾allocN─╼ │ ╾──╼ ╾allocN─╼ │ ╾──╼
} }
error: any use of this value will cause an error
--> $DIR/ub-wide-ptr.rs:100:42
|
LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]);
| -----------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| |
| referenced constant has errors
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:103:1 --> $DIR/ub-wide-ptr.rs:109:1
| |
LL | / const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe { LL | / const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe {
LL | | LL | |
@ -187,7 +220,7 @@ LL | | };
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:111:1 --> $DIR/ub-wide-ptr.rs:117:1
| |
LL | const TRAIT_OBJ_SHORT_VTABLE_1: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u8))) }; LL | const TRAIT_OBJ_SHORT_VTABLE_1: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u8))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered too small vtable | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered too small vtable
@ -198,7 +231,7 @@ LL | const TRAIT_OBJ_SHORT_VTABLE_1: W<&dyn Trait> = unsafe { mem::transmute(W((
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:114:1 --> $DIR/ub-wide-ptr.rs:120:1
| |
LL | const TRAIT_OBJ_SHORT_VTABLE_2: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u64))) }; LL | const TRAIT_OBJ_SHORT_VTABLE_2: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u64))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered too small vtable | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered too small vtable
@ -209,7 +242,7 @@ LL | const TRAIT_OBJ_SHORT_VTABLE_2: W<&dyn Trait> = unsafe { mem::transmute(W((
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:117:1 --> $DIR/ub-wide-ptr.rs:123:1
| |
LL | const TRAIT_OBJ_INT_VTABLE: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, 4usize))) }; LL | const TRAIT_OBJ_INT_VTABLE: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, 4usize))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered dangling vtable pointer in wide pointer | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered dangling vtable pointer in wide pointer
@ -220,7 +253,7 @@ LL | const TRAIT_OBJ_INT_VTABLE: W<&dyn Trait> = unsafe { mem::transmute(W((&92u
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:119:1 --> $DIR/ub-wide-ptr.rs:125:1
| |
LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, &[0u8; 128])) }; LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, &[0u8; 128])) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered unaligned vtable pointer in wide pointer | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered unaligned vtable pointer in wide pointer
@ -231,7 +264,7 @@ LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:121:1 --> $DIR/ub-wide-ptr.rs:127:1
| |
LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92u8, &[0usize; 8])) }; LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92u8, &[0usize; 8])) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function)
@ -242,7 +275,7 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:123:1 --> $DIR/ub-wide-ptr.rs:129:1
| |
LL | const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u8, &[1usize; 8])) }; LL | const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u8, &[1usize; 8])) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function)
@ -253,7 +286,7 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:125:1 --> $DIR/ub-wide-ptr.rs:131:1
| |
LL | const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &[&42u8; 8]))) }; LL | const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &[&42u8; 8]))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered invalid drop function pointer in vtable (not pointing to a function) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered invalid drop function pointer in vtable (not pointing to a function)
@ -264,7 +297,7 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: W<&dyn Trait> = unsafe { mem::trans
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:129:1 --> $DIR/ub-wide-ptr.rs:135:1
| |
LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) }; LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.<dyn-downcast>: encountered 0x03, but expected a boolean | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.<dyn-downcast>: encountered 0x03, but expected a boolean
@ -275,7 +308,7 @@ LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_,
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:133:1 --> $DIR/ub-wide-ptr.rs:139:1
| |
LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute((&92u8, 0usize)) }; LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute((&92u8, 0usize)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling vtable pointer in wide pointer | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling vtable pointer in wide pointer
@ -286,7 +319,7 @@ LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:135:1 --> $DIR/ub-wide-ptr.rs:141:1
| |
LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) }; LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered too small vtable | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered too small vtable
@ -297,17 +330,17 @@ LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transm
} }
error[E0080]: could not evaluate static initializer error[E0080]: could not evaluate static initializer
--> $DIR/ub-wide-ptr.rs:141:5 --> $DIR/ub-wide-ptr.rs:147:5
| |
LL | mem::transmute::<_, &dyn Trait>((&92u8, 0usize)) LL | mem::transmute::<_, &dyn Trait>((&92u8, 0usize))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is not a valid pointer | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is not a valid pointer
error[E0080]: could not evaluate static initializer error[E0080]: could not evaluate static initializer
--> $DIR/ub-wide-ptr.rs:145:5 --> $DIR/ub-wide-ptr.rs:151:5
| |
LL | mem::transmute::<_, &dyn Trait>((&92u8, &3u64)) LL | mem::transmute::<_, &dyn Trait>((&92u8, &3u64))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: allocN has size N, so pointer to 12 bytes starting at offset N is out-of-bounds | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: allocN has size N, so pointer to 12 bytes starting at offset N is out-of-bounds
error: aborting due to 29 previous errors error: aborting due to 32 previous errors
For more information about this error, try `rustc --explain E0080`. For more information about this error, try `rustc --explain E0080`.

65
src/test/ui/consts/const-eval/ub-wide-ptr.64bit.stderr
View file

@ -149,8 +149,19 @@ LL | const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
╾───────allocN───────╼ │ ╾──────╼ ╾───────allocN───────╼ │ ╾──────╼
} }
error: any use of this value will cause an error
--> $DIR/ub-wide-ptr.rs:87:40
|
LL | const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
| ---------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| |
| referenced constant has errors
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:93:1 --> $DIR/ub-wide-ptr.rs:95:1
| |
LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]); LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.0: encountered 0x03, but expected a boolean | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.0: encountered 0x03, but expected a boolean
@ -160,8 +171,19 @@ LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3
╾──────allocN───────╼ │ ╾──────╼ ╾──────allocN───────╼ │ ╾──────╼
} }
error: any use of this value will cause an error
--> $DIR/ub-wide-ptr.rs:95:42
|
LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]);
| -----------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| |
| referenced constant has errors
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:96:1 --> $DIR/ub-wide-ptr.rs:100:1
| |
LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]); LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.1[0]: encountered 0x03, but expected a boolean | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.1[0]: encountered 0x03, but expected a boolean
@ -171,8 +193,19 @@ LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::tran
╾──────allocN───────╼ │ ╾──────╼ ╾──────allocN───────╼ │ ╾──────╼
} }
error: any use of this value will cause an error
--> $DIR/ub-wide-ptr.rs:100:42
|
LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]);
| -----------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| |
| referenced constant has errors
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:103:1 --> $DIR/ub-wide-ptr.rs:109:1
| |
LL | / const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe { LL | / const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe {
LL | | LL | |
@ -187,7 +220,7 @@ LL | | };
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:111:1 --> $DIR/ub-wide-ptr.rs:117:1
| |
LL | const TRAIT_OBJ_SHORT_VTABLE_1: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u8))) }; LL | const TRAIT_OBJ_SHORT_VTABLE_1: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u8))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered too small vtable | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered too small vtable
@ -198,7 +231,7 @@ LL | const TRAIT_OBJ_SHORT_VTABLE_1: W<&dyn Trait> = unsafe { mem::transmute(W((
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:114:1 --> $DIR/ub-wide-ptr.rs:120:1
| |
LL | const TRAIT_OBJ_SHORT_VTABLE_2: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u64))) }; LL | const TRAIT_OBJ_SHORT_VTABLE_2: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u64))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered too small vtable | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered too small vtable
@ -209,7 +242,7 @@ LL | const TRAIT_OBJ_SHORT_VTABLE_2: W<&dyn Trait> = unsafe { mem::transmute(W((
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:117:1 --> $DIR/ub-wide-ptr.rs:123:1
| |
LL | const TRAIT_OBJ_INT_VTABLE: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, 4usize))) }; LL | const TRAIT_OBJ_INT_VTABLE: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, 4usize))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered dangling vtable pointer in wide pointer | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered dangling vtable pointer in wide pointer
@ -220,7 +253,7 @@ LL | const TRAIT_OBJ_INT_VTABLE: W<&dyn Trait> = unsafe { mem::transmute(W((&92u
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:119:1 --> $DIR/ub-wide-ptr.rs:125:1
| |
LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, &[0u8; 128])) }; LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, &[0u8; 128])) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered unaligned vtable pointer in wide pointer | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered unaligned vtable pointer in wide pointer
@ -231,7 +264,7 @@ LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:121:1 --> $DIR/ub-wide-ptr.rs:127:1
| |
LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92u8, &[0usize; 8])) }; LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92u8, &[0usize; 8])) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function)
@ -242,7 +275,7 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:123:1 --> $DIR/ub-wide-ptr.rs:129:1
| |
LL | const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u8, &[1usize; 8])) }; LL | const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u8, &[1usize; 8])) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function)
@ -253,7 +286,7 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:125:1 --> $DIR/ub-wide-ptr.rs:131:1
| |
LL | const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &[&42u8; 8]))) }; LL | const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &[&42u8; 8]))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered invalid drop function pointer in vtable (not pointing to a function) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .0: encountered invalid drop function pointer in vtable (not pointing to a function)
@ -264,7 +297,7 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: W<&dyn Trait> = unsafe { mem::trans
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:129:1 --> $DIR/ub-wide-ptr.rs:135:1
| |
LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) }; LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.<dyn-downcast>: encountered 0x03, but expected a boolean | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<deref>.<dyn-downcast>: encountered 0x03, but expected a boolean
@ -275,7 +308,7 @@ LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_,
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:133:1 --> $DIR/ub-wide-ptr.rs:139:1
| |
LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute((&92u8, 0usize)) }; LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute((&92u8, 0usize)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling vtable pointer in wide pointer | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling vtable pointer in wide pointer
@ -286,7 +319,7 @@ LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute
} }
error[E0080]: it is undefined behavior to use this value error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:135:1 --> $DIR/ub-wide-ptr.rs:141:1
| |
LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) }; LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered too small vtable | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered too small vtable
@ -297,17 +330,17 @@ LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transm
} }
error[E0080]: could not evaluate static initializer error[E0080]: could not evaluate static initializer
--> $DIR/ub-wide-ptr.rs:141:5 --> $DIR/ub-wide-ptr.rs:147:5
| |
LL | mem::transmute::<_, &dyn Trait>((&92u8, 0usize)) LL | mem::transmute::<_, &dyn Trait>((&92u8, 0usize))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is not a valid pointer | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is not a valid pointer
error[E0080]: could not evaluate static initializer error[E0080]: could not evaluate static initializer
--> $DIR/ub-wide-ptr.rs:145:5 --> $DIR/ub-wide-ptr.rs:151:5
| |
LL | mem::transmute::<_, &dyn Trait>((&92u8, &3u64)) LL | mem::transmute::<_, &dyn Trait>((&92u8, &3u64))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: allocN has size N, so pointer to 24 bytes starting at offset N is out-of-bounds | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: allocN has size N, so pointer to 24 bytes starting at offset N is out-of-bounds
error: aborting due to 29 previous errors error: aborting due to 32 previous errors
For more information about this error, try `rustc --explain E0080`. For more information about this error, try `rustc --explain E0080`.

6
src/test/ui/consts/const-eval/ub-wide-ptr.rs
View file

@ -86,15 +86,21 @@ const SLICE_LENGTH_PTR_BOX: Box<[u8]> = unsafe { mem::transmute((&42u8, &3)) };
// bad data *inside* the slice // bad data *inside* the slice
const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }]; const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
//~^ ERROR it is undefined behavior to use this value //~^ ERROR it is undefined behavior to use this value
//~| ERROR any use of this value will cause an error
//~| WARNING this was previously accepted
// good MySliceBool // good MySliceBool
const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]); const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]);
// bad: sized field is not okay // bad: sized field is not okay
const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]); const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]);
//~^ ERROR it is undefined behavior to use this value //~^ ERROR it is undefined behavior to use this value
//~| ERROR any use of this value will cause an error
//~| WARNING this was previously accepted
// bad: unsized part is not okay // bad: unsized part is not okay
const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]); const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]);
//~^ ERROR it is undefined behavior to use this value //~^ ERROR it is undefined behavior to use this value
//~| ERROR any use of this value will cause an error
//~| WARNING this was previously accepted
// # raw slice // # raw slice
const RAW_SLICE_VALID: *const [u8] = unsafe { mem::transmute((&42u8, 1usize)) }; // ok const RAW_SLICE_VALID: *const [u8] = unsafe { mem::transmute((&42u8, 1usize)) }; // ok