From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- src/tools/clippy/tests/ui/cast_ref_to_mut.rs | 31 ++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 src/tools/clippy/tests/ui/cast_ref_to_mut.rs (limited to 'src/tools/clippy/tests/ui/cast_ref_to_mut.rs') 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; + } +} -- cgit v1.2.3