Don't set FILE_ATTRIBUTE_HIDDEN

If this attribute is set, we cannot close and reopen the file and then
write to it. Attempting to open the file a second time in write mode
results in `ERROR_ACCESS_DENIED`.

For reference, see the CreateFile MSDN docs:

    If CREATE_ALWAYS and FILE_ATTRIBUTE_NORMAL are specified, CreateFile
    fails and sets the last error to ERROR_ACCESS_DENIED if the file
    exists and has the FILE_ATTRIBUTE_HIDDEN or FILE_ATTRIBUTE_SYSTEM
    attribute. To avoid the error, specify the same attributes as the
    existing file.

src/file/imp/windows.rs

@@ -10,7 +10,7 @@ use winapi::um::fileapi::{CreateFileW, SetFileAttributesW, CREATE_NEW};
 use winapi::um::handleapi::INVALID_HANDLE_VALUE;
 use winapi::um::winbase::{FILE_FLAG_DELETE_ON_CLOSE, MOVEFILE_REPLACE_EXISTING};
 use winapi::um::winbase::{MoveFileExW, ReOpenFile};
-use winapi::um::winnt::{FILE_ATTRIBUTE_HIDDEN, FILE_ATTRIBUTE_NORMAL, FILE_ATTRIBUTE_TEMPORARY};
+use winapi::um::winnt::{FILE_ATTRIBUTE_NORMAL, FILE_ATTRIBUTE_TEMPORARY};
 use winapi::um::winnt::{FILE_GENERIC_READ, FILE_GENERIC_WRITE, HANDLE};
 use winapi::um::winnt::{FILE_SHARE_DELETE, FILE_SHARE_READ, FILE_SHARE_WRITE};
 
@@ -24,8 +24,7 @@ const SHARE_MODE: DWORD = FILE_SHARE_DELETE
                         | FILE_SHARE_READ
                         | FILE_SHARE_WRITE;
 #[cfg_attr(irustfmt, rustfmt_skip)]
-const FLAGS: DWORD      = FILE_ATTRIBUTE_HIDDEN
-                        | FILE_ATTRIBUTE_TEMPORARY;
+const FLAGS: DWORD      = FILE_ATTRIBUTE_TEMPORARY;
 
 fn to_utf16(s: &Path) -> Vec<u16> {
     s.as_os_str()

tests/namedtempfile.rs

@@ -201,3 +201,9 @@ fn test_temppath_persist_noclobber() {
     assert_eq!("abcde", buf);
     std::fs::remove_file(&persist_path).unwrap();
 }
+
+#[test]
+fn test_write_after_close() {
+    let path = NamedTempFile::new().unwrap().into_temp_path();
+    File::create(path).unwrap().write_all(b"test").unwrap();
+}