refactor

- try to avoid warnings when compiled on Windows

Author: Byron

tests/tools/tests/umask.rs

@@ -1,12 +1,11 @@
-use std::fs::File;
-use std::io::{BufRead, BufReader};
-
-use bstr::ByteSlice;
-
 #[test]
 #[cfg(unix)]
 #[cfg_attr(not(target_os = "linux"), ignore = "The test itself uses /proc")]
 fn umask() {
+    use std::fs::File;
+    use std::io::{BufRead, BufReader};
+
+    use bstr::ByteSlice;
     // Check against the umask obtained via a less portable but also completely safe method.
     let less_portable = BufReader::new(File::open("/proc/self/status").expect("can open"))
         .split(b'\n')