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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/consts/miri_unleashed/mutable_references.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/consts/miri_unleashed/mutable_references.rs')
-rw-r--r-- | src/test/ui/consts/miri_unleashed/mutable_references.rs | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/test/ui/consts/miri_unleashed/mutable_references.rs b/src/test/ui/consts/miri_unleashed/mutable_references.rs new file mode 100644 index 000000000..ca927ef4a --- /dev/null +++ b/src/test/ui/consts/miri_unleashed/mutable_references.rs @@ -0,0 +1,37 @@ +// compile-flags: -Zunleash-the-miri-inside-of-you +#![allow(const_err)] + +use std::cell::UnsafeCell; + +// a test demonstrating what things we could allow with a smarter const qualification + +// this is fine because is not possible to mutate through an immutable reference. +static FOO: &&mut u32 = &&mut 42; + +// this is fine because accessing an immutable static `BAR` is equivalent to accessing `*&BAR` +// which puts the mutable reference behind an immutable one. +static BAR: &mut () = &mut (); + +struct Foo<T>(T); + +// this is fine for the same reason as `BAR`. +static BOO: &mut Foo<()> = &mut Foo(()); + +// interior mutability is fine +struct Meh { + x: &'static UnsafeCell<i32>, +} +unsafe impl Sync for Meh {} +static MEH: Meh = Meh { + x: &UnsafeCell::new(42), +}; + +// this is fine for the same reason as `BAR`. +static OH_YES: &mut i32 = &mut 42; + +fn main() { + unsafe { + *MEH.x.get() = 99; + } + *OH_YES = 99; //~ ERROR cannot assign to `*OH_YES`, as `OH_YES` is an immutable static item +} |