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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:03 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:03 +0000 |
commit | 64d98f8ee037282c35007b64c2649055c56af1db (patch) | |
tree | 5492bcf97fce41ee1c0b1cc2add283f3e66cdab0 /tests/ui/consts/miri_unleashed/mutable_references.rs | |
parent | Adding debian version 1.67.1+dfsg1-1. (diff) | |
download | rustc-64d98f8ee037282c35007b64c2649055c56af1db.tar.xz rustc-64d98f8ee037282c35007b64c2649055c56af1db.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/consts/miri_unleashed/mutable_references.rs')
-rw-r--r-- | tests/ui/consts/miri_unleashed/mutable_references.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/tests/ui/consts/miri_unleashed/mutable_references.rs b/tests/ui/consts/miri_unleashed/mutable_references.rs new file mode 100644 index 000000000..4e9964647 --- /dev/null +++ b/tests/ui/consts/miri_unleashed/mutable_references.rs @@ -0,0 +1,36 @@ +// compile-flags: -Zunleash-the-miri-inside-of-you + +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 +} |