Remove unnecessary Rc

src/util.rs

@@ -5,30 +5,28 @@ use std::thread_local;
 use std::{
     cell::UnsafeCell,
     path::{Path, PathBuf},
-    rc::Rc,
 };
 use std::{io, str};
 
 use crate::error::IoResultExt;
 
 thread_local! {
-    static THREAD_RNG_KEY: Rc<UnsafeCell<SmallRng>> = Rc::new(UnsafeCell::new(SmallRng::from_entropy()));
+    static THREAD_RNG: UnsafeCell<SmallRng> = UnsafeCell::new(SmallRng::from_entropy());
 }
 
 fn tmpname(prefix: &OsStr, suffix: &OsStr, rand_len: usize) -> OsString {
-    let rng = THREAD_RNG_KEY.with(|t| t.clone());
     let mut buf = OsString::with_capacity(prefix.len() + suffix.len() + rand_len);
     buf.push(prefix);
 
     // Push each character in one-by-one. Unfortunately, this is the only
     // safe(ish) simple way to do this without allocating a temporary
     // String/Vec.
-    unsafe {
+    THREAD_RNG.with(|rng| unsafe {
         (&mut *rng.get())
             .sample_iter(&Alphanumeric)
             .take(rand_len)
             .for_each(|b| buf.push(str::from_utf8_unchecked(&[b as u8])))
-    }
+    });
     buf.push(suffix);
     buf
 }