Auto merge of #38499 - alexcrichton:rollup, r=alexcrichton

Rollup of 29 pull requests

- Successful merges: #37761, #38006, #38131, #38150, #38158, #38171, #38208, #38215, #38236, #38245, #38289, #38302, #38315, #38346, #38388, #38395, #38398, #38418, #38432, #38451, #38463, #38468, #38470, #38471, #38472, #38478, #38486, #38493, #38498
- Failed merges: #38271, #38483

2 files changed, 32 insertions, 1 deletions

diff --git a/src/libstd/thread/local.rs b/src/libstd/thread/local.rs
index f74dd592495..01584979aab 100644
--- a/src/libstd/thread/local.rs
+++ b/src/libstd/thread/local.rs
@@ -13,6 +13,7 @@
 #![unstable(feature = "thread_local_internals", issue = "0")]
 
 use cell::UnsafeCell;
+use fmt;
 use mem;
 
 /// A thread local storage key which owns its contents.
@@ -98,6 +99,13 @@ pub struct LocalKey<T: 'static> {
     init: fn() -> T,
 }
 
+#[stable(feature = "std_debug", since = "1.15.0")]
+impl<T: 'static> fmt::Debug for LocalKey<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("LocalKey { .. }")
+    }
+}
+
 /// Declare a new thread local storage key of type `std::thread::LocalKey`.
 ///
 /// # Syntax
@@ -184,7 +192,7 @@ macro_rules! __thread_local_inner {
 #[unstable(feature = "thread_local_state",
            reason = "state querying was recently added",
            issue = "27716")]
-#[derive(Eq, PartialEq, Copy, Clone)]
+#[derive(Debug, Eq, PartialEq, Copy, Clone)]
 pub enum LocalKeyState {
     /// All keys are in this state whenever a thread starts. Keys will
     /// transition to the `Valid` state once the first call to `with` happens
@@ -313,6 +321,7 @@ impl<T: 'static> LocalKey<T> {
 #[doc(hidden)]
 pub mod os {
     use cell::{Cell, UnsafeCell};
+    use fmt;
     use marker;
     use ptr;
     use sys_common::thread_local::StaticKey as OsStaticKey;
@@ -323,6 +332,13 @@ pub mod os {
         marker: marker::PhantomData<Cell<T>>,
     }
 
+    #[stable(feature = "std_debug", since = "1.15.0")]
+    impl<T> fmt::Debug for Key<T> {
+        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+            f.pad("Key { .. }")
+        }
+    }
+
     unsafe impl<T> ::marker::Sync for Key<T> { }
 
     struct Value<T: 'static> {
diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index 55adc3dabf4..2a3fb5ec43f 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -217,6 +217,7 @@ pub use self::local::{LocalKey, LocalKeyState};
 /// Thread configuration. Provides detailed control over the properties
 /// and behavior of new threads.
 #[stable(feature = "rust1", since = "1.0.0")]
+#[derive(Debug)]
 pub struct Builder {
     // A name for the thread-to-be, for identification in panic messages
     name: Option<String>,
@@ -587,6 +588,13 @@ impl ThreadId {
     }
 }
 
+#[stable(feature = "std_debug", since = "1.15.0")]
+impl fmt::Debug for ThreadId {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("ThreadId { .. }")
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Thread
 ////////////////////////////////////////////////////////////////////////////////
@@ -802,6 +810,13 @@ impl<T> IntoInner<imp::Thread> for JoinHandle<T> {
     fn into_inner(self) -> imp::Thread { self.0.native.unwrap() }
 }
 
+#[stable(feature = "std_debug", since = "1.15.0")]
+impl<T> fmt::Debug for JoinHandle<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("JoinHandle { .. }")
+    }
+}
+
 fn _assert_sync_and_send() {
     fn _assert_both<T: Send + Sync>() {}
     _assert_both::<JoinHandle<()>>();