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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/tools/clippy/tests/ui/uninit.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 '')
-rw-r--r-- | src/tools/clippy/tests/ui/uninit.rs | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/uninit.rs b/src/tools/clippy/tests/ui/uninit.rs new file mode 100644 index 000000000..dac5ce272 --- /dev/null +++ b/src/tools/clippy/tests/ui/uninit.rs @@ -0,0 +1,26 @@ +#![feature(stmt_expr_attributes)] +#![allow(clippy::let_unit_value)] + +use std::mem::{self, MaybeUninit}; + +fn main() { + let _: usize = unsafe { MaybeUninit::uninit().assume_init() }; + + // edge case: For now we lint on empty arrays + let _: [u8; 0] = unsafe { MaybeUninit::uninit().assume_init() }; + + // edge case: For now we accept unit tuples + let _: () = unsafe { MaybeUninit::uninit().assume_init() }; + + // This is OK, because `MaybeUninit` allows uninitialized data. + let _: MaybeUninit<usize> = unsafe { MaybeUninit::uninit().assume_init() }; + + // This is OK, because all constitutent types are uninit-compatible. + let _: (MaybeUninit<usize>, MaybeUninit<bool>) = unsafe { MaybeUninit::uninit().assume_init() }; + + // This is OK, because all constitutent types are uninit-compatible. + let _: (MaybeUninit<usize>, [MaybeUninit<bool>; 2]) = unsafe { MaybeUninit::uninit().assume_init() }; + + // Was a false negative. + let _: usize = unsafe { mem::MaybeUninit::uninit().assume_init() }; +} |