auto merge of #13184 : alexcrichton/rust/priv-fields, r=brson

This is an implementation of a portion of [RFC #4](https://github.com/rust-lang/rfcs/blob/master/active/0004-private-fields.md). This PR makes named struct fields private by default (as opposed to inherited by default).

The only real meaty change is the first commit to `rustc`, all other commits are just fallout of that change.

Summary of changes made:

* Named fields are private by default *everywhere*
* The `priv` keyword is now default-deny on named fields (done in a "lint" pass in privacy)

Changes yet to be done (before the RFC is closed)

* Change tuple structs to have private fields by default
* Remove `priv` enum variants
* Make `priv` a reserved keyword

1 files changed, 3 insertions, 3 deletions

diff --git a/src/libstd/rt/thread.rs b/src/libstd/rt/thread.rs
index 1802016e3b3..c35ffac064c 100644
--- a/src/libstd/rt/thread.rs
+++ b/src/libstd/rt/thread.rs
@@ -28,9 +28,9 @@ type StartFn = extern "C" fn(*libc::c_void) -> imp::rust_thread_return;
 /// This struct represents a native thread's state. This is used to join on an
 /// existing thread created in the join-able state.
 pub struct Thread<T> {
-    priv native: imp::rust_thread,
-    priv joined: bool,
-    priv packet: ~Option<T>,
+    native: imp::rust_thread,
+    joined: bool,
+    packet: ~Option<T>,
 }
 
 static DEFAULT_STACK_SIZE: uint = 1024 * 1024;