Add missing newline to error message of the default OOM hook

Author: hyd-dev

library/std/src/alloc.rs

@@ -316,7 +316,7 @@ pub fn take_alloc_error_hook() -> fn(Layout) {
 }
 
 fn default_alloc_error_hook(layout: Layout) {
-    dumb_print(format_args!("memory allocation of {} bytes failed", layout.size()));
+    dumb_print(format_args!("memory allocation of {} bytes failed\n", layout.size()));
 }
 
 #[cfg(not(test))]

src/test/ui/default-alloc-error-hook.rs

@@ -16,5 +16,5 @@ fn main() {
     let me = env::current_exe().unwrap();
     let output = Command::new(&me).arg("next").output().unwrap();
     assert!(!output.status.success(), "{:?} is a success", output.status);
-    assert_eq!(str::from_utf8(&output.stderr).unwrap(), "memory allocation of 42 bytes failed");
+    assert_eq!(str::from_utf8(&output.stderr).unwrap(), "memory allocation of 42 bytes failed\n");
 }