tests/ui/transmute/unnecessary-transmutation.rs

//@ run-rustfix
#![deny(unnecessary_transmutes)]
#![allow(unused_unsafe, unused_imports, unused_variables, unused_parens)]
use std::mem::transmute;

pub fn bytes_at_home(x: u32) -> [u8; 4] {
    unsafe { transmute(x) }
    //~^ ERROR
}

pub const fn intinator_const(from: bool) -> u8 {
    unsafe { transmute(from) }
    //~^ ERROR
}

pub static X: u8 = unsafe { transmute(true) };
//~^ ERROR
pub const Y: u8 = unsafe { transmute(true) };
//~^ ERROR

pub struct Z {}
impl Z {
    pub const fn intinator_assoc(x: bool) -> u8 {
        unsafe { transmute(x) }
        //~^ ERROR
    }
}

fn main() {
    const { unsafe { transmute::<_, u8>(true) } };
    //~^ ERROR
    unsafe {
        let x: u16 = transmute(*b"01");
        //~^ ERROR
        let x: [u8; 2] = transmute(x);
        //~^ ERROR
        let x: u32 = transmute(*b"0123");
        //~^ ERROR
        let x: [u8; 4] = transmute(x);
        //~^ ERROR
        let x: u64 = transmute(*b"feriscat");
        //~^ ERROR
        let x: [u8; 8] = transmute(x);
        //~^ ERROR

        let y: i16 = transmute(*b"01");
        //~^ ERROR
        let y: [u8; 2] = transmute(y);
        //~^ ERROR
        let y: i32 = transmute(*b"0123");
        //~^ ERROR
        let y: [u8; 4] = transmute(y);
        //~^ ERROR
        let y: i64 = transmute(*b"feriscat");
        //~^ ERROR
        let y: [u8; 8] = transmute(y);
        //~^ ERROR

        let z: f32 = transmute(*b"0123");
        //~^ ERROR
        let z: [u8; 4] = transmute(z);
        //~^ ERROR
        let z: f64 = transmute(*b"feriscat");
        //~^ ERROR
        let z: [u8; 8] = transmute(z);
        //~^ ERROR

        let y: u32 = transmute('🦀');
        //~^ ERROR
        let y: char = transmute(y);
        //~^ ERROR
        let y: i32 = transmute('🐱');
        //~^ ERROR
        let y: char = transmute(y);
        //~^ ERROR

        let x: u16 = transmute(8i16);
        //~^ ERROR
        let x: i16 = transmute(x);
        //~^ ERROR
        let x: u32 = transmute(4i32);
        //~^ ERROR
        let x: i32 = transmute(x);
        //~^ ERROR
        let x: u64 = transmute(7i64);
        //~^ ERROR
        let x: i64 = transmute(x);
        //~^ ERROR

        let y: f32 = transmute(1u32);
        //~^ ERROR
        let y: u32 = transmute(y);
        //~^ ERROR
        let y: f64 = transmute(3u64);
        //~^ ERROR
        let y: u64 = transmute(2.0);
        //~^ ERROR

        let y: f64 = transmute(1i64);
        //~^ ERROR
        let y: i64 = transmute(1f64);
        //~^ ERROR

        let z: bool = transmute(1u8);
        // clippy
        let z: u8 = transmute(z);
        //~^ ERROR

        let z: bool = transmute(1i8);
        // clippy
        let z: i8 = transmute(z);
        //~^ ERROR
    }
}