avoid &mut on the read path since it now allows concurrent readers

the8472 · the8472 · commit 2200cf10d805 · 2021-02-08T23:31:49.000+01:00
diff --git a/library/std/src/sys/unix/os.rs b/library/std/src/sys/unix/os.rs
@@ -491,7 +491,7 @@ pub unsafe fn environ() -> *mut *const *const c_char {
     extern "C" {
         static mut environ: *const *const c_char;
     }
-    &mut environ
+    ptr::addr_of_mut!(environ)
 }
 
 pub unsafe fn env_rwlock(readonly: bool) -> RWLockGuard {

Original file line number	Diff line number	Diff line change
`@@ -491,7 +491,7 @@ pub unsafe fn environ() -> mut const *const c_char {`
`491`	`491`	`extern "C" {`
`492`	`492`	`static mut environ: const const c_char;`
`493`	`493`	`}`
`494`		`- &mut environ`
	`494`	`+ ptr::addr_of_mut!(environ)`
`495`	`495`	`}`
`496`	`496`
`497`	`497`	`pub unsafe fn env_rwlock(readonly: bool) -> RWLockGuard {`