Rollup merge of rust-lang#24212 - alexcrichton:destabilize-begin-unwind, r=huonw

 Now that we have a `#[allow_internal_unstable]` attribute for macros there's no
need for these two `begin_unwind` functions to be stable. Right now the `panic!`
interface is the only one we wish to stabilize, so remove the stability markers
from these functions.

While this is a breaking change, it is highly unlikely to break any actual code.
It is recommended to use the `panic!` macro instead if it breaks explicit calls
into `std::rt`.

[breaking-change]
cc rust-lang#24208

Author: Manishearth

src/libstd/macros.rs

@@ -37,6 +37,7 @@
 /// ```
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[allow_internal_unstable]
 macro_rules! panic {
     () => ({
         panic!("explicit panic")

src/libstd/rt/unwind.rs

@@ -495,7 +495,6 @@ pub extern fn rust_begin_unwind(msg: fmt::Arguments,
 /// on (e.g.) the inlining of other functions as possible), by moving
 /// the actual formatting into this shared place.
 #[inline(never)] #[cold]
-#[stable(since = "1.0.0", feature = "rust1")]
 pub fn begin_unwind_fmt(msg: fmt::Arguments, file_line: &(&'static str, usize)) -> ! {
     use fmt::Write;
 
@@ -511,7 +510,6 @@ pub fn begin_unwind_fmt(msg: fmt::Arguments, file_line: &(&'static str, usize))
 
 /// This is the entry point of unwinding for panic!() and assert!().
 #[inline(never)] #[cold] // avoid code bloat at the call sites as much as possible
-#[stable(since = "1.0.0", feature = "rust1")]
 pub fn begin_unwind<M: Any + Send>(msg: M, file_line: &(&'static str, usize)) -> ! {
     // Note that this should be the only allocation performed in this code path.
     // Currently this means that panic!() on OOM will invoke this code path,
@@ -598,7 +596,6 @@ fn begin_unwind_inner(msg: Box<Any + Send>,
 /// Only a limited number of callbacks can be registered, and this function
 /// returns whether the callback was successfully registered or not. It is not
 /// currently possible to unregister a callback once it has been registered.
-#[unstable(feature = "std_misc")]
 pub unsafe fn register(f: Callback) -> bool {
     match CALLBACK_CNT.fetch_add(1, Ordering::SeqCst) {
         // The invocation code has knowledge of this window where the count has

src/test/run-pass-fulldeps/rename-directory.rs

@@ -12,7 +12,6 @@
 // because it needs TempDir, which is in extra
 
 // ignore-android
-// pretty-expanded FIXME #23616
 
 #![feature(rustc_private, path_ext)]
 

src/test/run-pass/argument-passing.rs

@@ -9,7 +9,6 @@
 // except according to those terms.
 
 
-// pretty-expanded FIXME #23616
 
 struct X {
     x: isize

src/test/run-pass/arith-2.rs

@@ -10,7 +10,6 @@
 
 
 
-// pretty-expanded FIXME #23616
 
 pub fn main() {
     let i32_c: isize = 0x10101010;

src/test/run-pass/arith-unsigned.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// pretty-expanded FIXME #23616
 
 #![allow(type_limits)]
 

src/test/run-pass/artificial-block.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// pretty-expanded FIXME #23616
 
 fn f() -> isize { { return 3; } }
 

src/test/run-pass/as-precedence.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// pretty-expanded FIXME #23616
 
 fn main() {
     assert_eq!(3 as usize * 3, 9);

src/test/run-pass/asm-in-out-operand.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// pretty-expanded FIXME #23616
 
 #![feature(asm)]
 

src/test/run-pass/asm-out-assign.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// pretty-expanded FIXME #23616
 
 #![feature(asm)]