auto merge of #16074 : nham/rust/bitflags_traits, r=alexcrichton

I wanted to add an implementation of `Default` inside the bitflags macro, but `Default` isn't in the prelude, which means anyone who wants to use `bitflags!` needs to import it. This seems not nice, so I've just implemented for `FilePermission` instead.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 4277b509962..f1b92b973c8 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -223,6 +223,7 @@ responding to errors that may occur while attempting to read the numbers.
 
 use char::Char;
 use collections::Collection;
+use default::Default;
 use fmt;
 use int;
 use iter::Iterator;
@@ -1795,7 +1796,6 @@ pub struct UnstableFileStat {
 bitflags!(
     #[doc="A set of permissions for a file or directory is represented
 by a set of flags which are or'd together."]
-    #[deriving(Hash)]
     #[deriving(Show)]
     flags FilePermission: u32 {
         static UserRead     = 0o400,
@@ -1830,6 +1830,11 @@ on unix-like systems."]
     }
 )
 
+impl Default for FilePermission {
+    #[inline]
+    fn default() -> FilePermission { FilePermission::empty() }
+}
+
 #[cfg(test)]
 mod tests {
     use super::{IoResult, Reader, MemReader, NoProgress, InvalidInput};