Small fixes

Author: NathanRoyer

library/std/src/os/custom/mod.rs

@@ -46,7 +46,7 @@
 macro_rules! custom_os_impl {
     ($module:ident, $method:ident $(, $arg:expr)*) => {{
         let errmsg = concat!(
-            "std::os::", stringify!($module), "::IMPL",
+            "std::os::custom::", stringify!($module), "::IMPL",
             " has not been initialized at this point",
         );
 

library/std/src/sync/poison.rs

@@ -70,9 +70,7 @@ impl Guard {
     /// bypass the poison checks.
     pub fn no_check() -> Self {
         // by setting `panicking` to true, `poison::Flag::done` doesn't call `thread::panicking`
-        Self {
-            panicking: true,
-        }
+        Self { panicking: true }
     }
 }
 

library/std/src/sys/custom/thread_local_key.rs

@@ -1,5 +1,5 @@
-use crate::sync::{RwLock, Mutex};
 use crate::os::custom::thread::{ThreadId, IMPL};
+use crate::sync::{Mutex, RwLock};
 
 pub type Key = usize;