mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-13 08:27:14 +00:00
111 lines
3.8 KiB
Rust
111 lines
3.8 KiB
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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extern crate core;
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use std::mem::transmute as my_transmute;
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use std::vec::Vec as MyVec;
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fn my_vec() -> MyVec<i32> {
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vec![]
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}
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#[allow(needless_lifetimes)]
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#[deny(useless_transmute)]
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unsafe fn _generic<'a, T, U: 'a>(t: &'a T) {
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let _: &'a T = core::intrinsics::transmute(t);
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//~^ ERROR transmute from a type (`&'a T`) to itself
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let _: &'a U = core::intrinsics::transmute(t);
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}
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#[deny(transmute_ptr_to_ref)]
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unsafe fn _ptr_to_ref<T, U>(p: *const T, m: *mut T, o: *const U, om: *mut U) {
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let _: &T = std::mem::transmute(p);
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//~^ ERROR transmute from a pointer type (`*const T`) to a reference type (`&T`)
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//~| HELP try
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//~| SUGGESTION = &*p;
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let _: &T = &*p;
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let _: &mut T = std::mem::transmute(m);
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//~^ ERROR transmute from a pointer type (`*mut T`) to a reference type (`&mut T`)
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//~| HELP try
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//~| SUGGESTION = &mut *m;
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let _: &mut T = &mut *m;
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let _: &T = std::mem::transmute(m);
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//~^ ERROR transmute from a pointer type (`*mut T`) to a reference type (`&T`)
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//~| HELP try
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//~| SUGGESTION = &*m;
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let _: &T = &*m;
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let _: &T = std::mem::transmute(o);
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//~^ ERROR transmute from a pointer type (`*const U`) to a reference type (`&T`)
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//~| HELP try
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//~| SUGGESTION = &*(o as *const T);
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let _: &T = &*(o as *const T);
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let _: &mut T = std::mem::transmute(om);
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//~^ ERROR transmute from a pointer type (`*mut U`) to a reference type (`&mut T`)
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//~| HELP try
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//~| SUGGESTION = &mut *(om as *mut T);
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let _: &mut T = &mut *(om as *mut T);
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let _: &T = std::mem::transmute(om);
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//~^ ERROR transmute from a pointer type (`*mut U`) to a reference type (`&T`)
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//~| HELP try
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//~| SUGGESTION = &*(om as *const T);
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let _: &T = &*(om as *const T);
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}
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#[deny(useless_transmute)]
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fn useless() {
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unsafe {
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let _: Vec<i32> = core::intrinsics::transmute(my_vec());
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//~^ ERROR transmute from a type (`std::vec::Vec<i32>`) to itself
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let _: Vec<i32> = core::mem::transmute(my_vec());
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//~^ ERROR transmute from a type (`std::vec::Vec<i32>`) to itself
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let _: Vec<i32> = std::intrinsics::transmute(my_vec());
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//~^ ERROR transmute from a type (`std::vec::Vec<i32>`) to itself
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let _: Vec<i32> = std::mem::transmute(my_vec());
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//~^ ERROR transmute from a type (`std::vec::Vec<i32>`) to itself
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let _: Vec<i32> = my_transmute(my_vec());
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//~^ ERROR transmute from a type (`std::vec::Vec<i32>`) to itself
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let _: Vec<u32> = core::intrinsics::transmute(my_vec());
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let _: Vec<u32> = core::mem::transmute(my_vec());
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let _: Vec<u32> = std::intrinsics::transmute(my_vec());
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let _: Vec<u32> = std::mem::transmute(my_vec());
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let _: Vec<u32> = my_transmute(my_vec());
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}
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}
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#[deny(crosspointer_transmute)]
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fn crosspointer() {
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let mut vec: Vec<i32> = vec![];
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let vec_const_ptr: *const Vec<i32> = &vec as *const Vec<i32>;
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let vec_mut_ptr: *mut Vec<i32> = &mut vec as *mut Vec<i32>;
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unsafe {
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let _: Vec<i32> = core::intrinsics::transmute(vec_const_ptr);
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//~^ ERROR transmute from a type (`*const std::vec::Vec<i32>`) to the type that it points to (`std::vec::Vec<i32>`)
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let _: Vec<i32> = core::intrinsics::transmute(vec_mut_ptr);
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//~^ ERROR transmute from a type (`*mut std::vec::Vec<i32>`) to the type that it points to (`std::vec::Vec<i32>`)
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let _: *const Vec<i32> = core::intrinsics::transmute(my_vec());
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//~^ ERROR transmute from a type (`std::vec::Vec<i32>`) to a pointer to that type (`*const std::vec::Vec<i32>`)
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let _: *mut Vec<i32> = core::intrinsics::transmute(my_vec());
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//~^ ERROR transmute from a type (`std::vec::Vec<i32>`) to a pointer to that type (`*mut std::vec::Vec<i32>`)
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}
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}
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fn main() {
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useless();
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crosspointer();
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}
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