winapi-rs invalid handle in union

Cargo.toml

[package]
name = "handletest"
version = "0.1.0"
authors = ["Peter Atashian <retep998@gmail.com>"]

[dependencies.winapi]
git = "https://github.com/retep998/winapi-rs"
branch = "dev"
features = ["minwinbase", "minwindef", "processthreadsapi", "winbase", "winnt"]

main.rs

extern crate winapi;

use std::mem::zeroed;
use std::ptr::null_mut;
use winapi::shared::minwindef::{BOOL, DWORD, LPVOID};
use winapi::um::minwinbase::{DEBUG_EVENT, EXIT_PROCESS_DEBUG_EVENT, LPDEBUG_EVENT, LPSECURITY_ATTRIBUTES, LOAD_DLL_DEBUG_EVENT};
use winapi::um::processthreadsapi::{LPPROCESS_INFORMATION, LPSTARTUPINFOW, PROCESS_INFORMATION, STARTUPINFOW};
use winapi::um::winbase::{CREATE_NEW_CONSOLE, DEBUG_PROCESS, INFINITE};
use winapi::um::winnt::{DBG_CONTINUE, LPCWSTR, LPWSTR};

use wide::ToWide;

extern "system" {
    pub fn CreateProcessW(
        lpApplicationName: LPCWSTR, lpCommandLine: LPWSTR,
        lpProcessAttributes: LPSECURITY_ATTRIBUTES, lpThreadAttributes: LPSECURITY_ATTRIBUTES,
        bInheritHandles: BOOL, dwCreationFlags: DWORD, lpEnvironment: LPVOID,
        lpCurrentDirectory: LPCWSTR, lpStartupInfo: LPSTARTUPINFOW,
        lpProcessInformation: LPPROCESS_INFORMATION,
    ) -> BOOL;
    pub fn WaitForDebugEvent(lpDebugEvent: LPDEBUG_EVENT, dwMilliseconds: DWORD) -> BOOL;
    pub fn ContinueDebugEvent(
        dwProcessId: DWORD, dwThreadId: DWORD, dwContinueStatus: DWORD,
    ) -> BOOL;
}

unsafe fn foo() {
    let mut si: STARTUPINFOW = zeroed();
    let mut pi: PROCESS_INFORMATION = zeroed();
    let err = CreateProcessW(r"C:\windows\system32\cmd.exe".to_wide_null().as_ptr(), null_mut(), null_mut(), null_mut(), 0, DEBUG_PROCESS | CREATE_NEW_CONSOLE, null_mut(), null_mut(), &mut si, &mut pi);
    assert!(err != 0);
    loop {
        let mut de: DEBUG_EVENT = zeroed();
        let err = WaitForDebugEvent(&mut de, INFINITE);
        assert!(err != 0);
        match de.dwDebugEventCode {
            EXIT_PROCESS_DEBUG_EVENT => {
                if de.dwProcessId == pi.dwProcessId {
                    break;
                }
            },
            LOAD_DLL_DEBUG_EVENT => {
                let handle = de.u.LoadDll().hFile;
                println!("{:08X}", handle as usize);
            },
            _ => {},
        }
        let err = ContinueDebugEvent(de.dwProcessId, de.dwThreadId, DBG_CONTINUE);
        assert!(err != 0);
    }
}
fn main() {
    unsafe { foo() }
}

mod wide {
    use std::ffi::OsStr;
    use std::os::windows::ffi::OsStrExt;

    pub trait ToWide {
        fn to_wide(&self) -> Vec<u16>;
        fn to_wide_null(&self) -> Vec<u16>;
    }
    impl<T> ToWide for T where T: AsRef<OsStr> {
        fn to_wide(&self) -> Vec<u16> {
            self.as_ref().encode_wide().collect()
        }
        fn to_wide_null(&self) -> Vec<u16> {
            self.as_ref().encode_wide().chain(Some(0)).collect()
        }
    }
}