std: Second pass stabilization of `default`

This commit performs a second pass stabilization of the `std::default` module.
The module was already marked `#[stable]`, and the inheritance of `#[stable]`
was removed since this attribute was applied. This commit adds the `#[stable]`
attribute to the trait definition and one method name, along with all
implementations found in the standard distribution.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 4baeaabc6c6..b9139c5d0e2 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -1911,7 +1911,9 @@ bitflags! {
 }
 
 
+#[stable]
 impl Default for FilePermission {
+    #[stable]
     #[inline]
     fn default() -> FilePermission { FilePermission::empty() }
 }