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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/cast_ref_to_mut.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/cast_ref_to_mut.rs | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/cast_ref_to_mut.rs b/src/tools/clippy/tests/ui/cast_ref_to_mut.rs new file mode 100644 index 000000000..c48a734ba --- /dev/null +++ b/src/tools/clippy/tests/ui/cast_ref_to_mut.rs @@ -0,0 +1,31 @@ +#![warn(clippy::cast_ref_to_mut)] +#![allow(clippy::no_effect, clippy::borrow_as_ptr)] + +extern "C" { + // N.B., mutability can be easily incorrect in FFI calls -- as + // in C, the default is mutable pointers. + fn ffi(c: *mut u8); + fn int_ffi(c: *mut i32); +} + +fn main() { + let s = String::from("Hello"); + let a = &s; + unsafe { + let num = &3i32; + let mut_num = &mut 3i32; + // Should be warned against + (*(a as *const _ as *mut String)).push_str(" world"); + *(a as *const _ as *mut _) = String::from("Replaced"); + *(a as *const _ as *mut String) += " world"; + // Shouldn't be warned against + println!("{}", *(num as *const _ as *const i16)); + println!("{}", *(mut_num as *mut _ as *mut i16)); + ffi(a.as_ptr() as *mut _); + int_ffi(num as *const _ as *mut _); + int_ffi(&3 as *const _ as *mut _); + let mut value = 3; + let value: *const i32 = &mut value; + *(value as *const i16 as *mut i16) = 42; + } +} |