rust/tests/compile-fail/transmute.rs
2016-03-24 15:48:38 -07:00

73 lines
2.6 KiB
Rust

#![feature(plugin)]
#![plugin(clippy)]
extern crate core;
use std::mem::transmute as my_transmute;
use std::vec::Vec as MyVec;
fn my_vec() -> MyVec<i32> {
vec![]
}
#[allow(needless_lifetimes)]
#[deny(useless_transmute)]
unsafe fn _generic<'a, T, U: 'a>(t: &'a T) {
let _: &'a T = core::intrinsics::transmute(t);
//~^ ERROR transmute from a type (`&'a T`) to itself
let _: &'a U = core::intrinsics::transmute(t);
}
#[deny(useless_transmute)]
fn useless() {
unsafe {
let _: Vec<i32> = core::intrinsics::transmute(my_vec());
//~^ ERROR transmute from a type (`collections::vec::Vec<i32>`) to itself
let _: Vec<i32> = core::mem::transmute(my_vec());
//~^ ERROR transmute from a type (`collections::vec::Vec<i32>`) to itself
let _: Vec<i32> = std::intrinsics::transmute(my_vec());
//~^ ERROR transmute from a type (`collections::vec::Vec<i32>`) to itself
let _: Vec<i32> = std::mem::transmute(my_vec());
//~^ ERROR transmute from a type (`collections::vec::Vec<i32>`) to itself
let _: Vec<i32> = my_transmute(my_vec());
//~^ ERROR transmute from a type (`collections::vec::Vec<i32>`) to itself
let _: Vec<u32> = core::intrinsics::transmute(my_vec());
let _: Vec<u32> = core::mem::transmute(my_vec());
let _: Vec<u32> = std::intrinsics::transmute(my_vec());
let _: Vec<u32> = std::mem::transmute(my_vec());
let _: Vec<u32> = my_transmute(my_vec());
}
}
#[deny(crosspointer_transmute)]
fn crosspointer() {
let mut vec: Vec<i32> = vec![];
let vec_const_ptr: *const Vec<i32> = &vec as *const Vec<i32>;
let vec_mut_ptr: *mut Vec<i32> = &mut vec as *mut Vec<i32>;
unsafe {
let _: Vec<i32> = core::intrinsics::transmute(vec_const_ptr);
//~^ ERROR transmute from a type (`*const collections::vec::Vec<i32>`) to the type that it points to (`collections::vec::Vec<i32>`)
let _: Vec<i32> = core::intrinsics::transmute(vec_mut_ptr);
//~^ ERROR transmute from a type (`*mut collections::vec::Vec<i32>`) to the type that it points to (`collections::vec::Vec<i32>`)
let _: *const Vec<i32> = core::intrinsics::transmute(my_vec());
//~^ ERROR transmute from a type (`collections::vec::Vec<i32>`) to a pointer to that type (`*const collections::vec::Vec<i32>`)
let _: *mut Vec<i32> = core::intrinsics::transmute(my_vec());
//~^ ERROR transmute from a type (`collections::vec::Vec<i32>`) to a pointer to that type (`*mut collections::vec::Vec<i32>`)
}
}
fn main() {
useless();
crosspointer();
}