---

yaml
---
r: 233519
b: refs/heads/beta
c: 288edec
h: refs/heads/master
i:
  233517: f800b4b
  233515: 25c2a82
  233511: 353603b
  233503: 964cb94
v: v3

Author: steveklabnik

[refs]

@@ -23,7 +23,7 @@ refs/tags/0.9: 36870b185fc5f5486636d4515f0e22677493f225
 refs/tags/0.10: ac33f2b15782272ae348dbd7b14b8257b2148b5a
 refs/tags/0.11.0: e1247cb1d0d681be034adb4b558b5a0c0d5720f9
 refs/tags/0.12.0: f0c419429ef30723ceaf6b42f9b5a2aeb5d2e2d1
-refs/heads/beta: 572526be2742e368cd522709eccd35df6428fd64
+refs/heads/beta: 288edec968441254d42b38ec3d8dec76767f0f24
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: 370fe2786109360f7c35b8ba552b83b773dd71d6
 refs/tags/1.0.0-alpha.2: 4c705f6bc559886632d3871b04f58aab093bfa2f

branches/beta/src/doc/reference.md

@@ -2059,6 +2059,11 @@ The following configurations must be defined by the implementation:
   `"mips"`, `"powerpc"`, `"arm"`, or `"aarch64"`.
 * `target_endian = "..."`. Endianness of the target CPU, either `"little"` or
   `"big"`.
+* `target_env = ".."` - an option provided by the compiler by default
+  describing the runtime environment of the target platform. Some examples of
+  this are `musl` for builds targeting the MUSL libc implementation, `msvc` for
+  Windows builds targeting MSVC, and `gnu` frequently the rest of the time. This
+  option may also be blank on some platforms.
 * `target_family = "..."`. Operating system family of the target, e. g.
   `"unix"` or `"windows"`. The value of this configuration option is defined
   as a configuration itself, like `unix` or `windows`.

branches/beta/src/doc/trpl/functions.md

@@ -214,61 +214,11 @@ fn diverges() -> ! {
 
 `panic!` is a macro, similar to `println!()` that we’ve already seen. Unlike
 `println!()`, `panic!()` causes the current thread of execution to crash with
-the given message. Because this function will cause a crash, it will never
-return, and so it has the type ‘`!`’, which is read ‘diverges’.
+the given message.
 
-If you add a main function that calls `diverges()` and run it, you’ll get
-some output that looks like this:
-
-```text
-thread ‘<main>’ panicked at ‘This function never returns!’, hello.rs:2
-```
-
-If you want more information, you can get a backtrace by setting the
-`RUST_BACKTRACE` environment variable:
-
-```text
-$ RUST_BACKTRACE=1 ./diverges
-thread '<main>' panicked at 'This function never returns!', hello.rs:2
-stack backtrace:
-   1:     0x7f402773a829 - sys::backtrace::write::h0942de78b6c02817K8r
-   2:     0x7f402773d7fc - panicking::on_panic::h3f23f9d0b5f4c91bu9w
-   3:     0x7f402773960e - rt::unwind::begin_unwind_inner::h2844b8c5e81e79558Bw
-   4:     0x7f4027738893 - rt::unwind::begin_unwind::h4375279447423903650
-   5:     0x7f4027738809 - diverges::h2266b4c4b850236beaa
-   6:     0x7f40277389e5 - main::h19bb1149c2f00ecfBaa
-   7:     0x7f402773f514 - rt::unwind::try::try_fn::h13186883479104382231
-   8:     0x7f402773d1d8 - __rust_try
-   9:     0x7f402773f201 - rt::lang_start::ha172a3ce74bb453aK5w
-  10:     0x7f4027738a19 - main
-  11:     0x7f402694ab44 - __libc_start_main
-  12:     0x7f40277386c8 - <unknown>
-  13:                0x0 - <unknown>
-```
-
-`RUST_BACKTRACE` also works with Cargo’s `run` command:
-
-```text
-$ RUST_BACKTRACE=1 cargo run
-     Running `target/debug/diverges`
-thread '<main>' panicked at 'This function never returns!', hello.rs:2
-stack backtrace:
-   1:     0x7f402773a829 - sys::backtrace::write::h0942de78b6c02817K8r
-   2:     0x7f402773d7fc - panicking::on_panic::h3f23f9d0b5f4c91bu9w
-   3:     0x7f402773960e - rt::unwind::begin_unwind_inner::h2844b8c5e81e79558Bw
-   4:     0x7f4027738893 - rt::unwind::begin_unwind::h4375279447423903650
-   5:     0x7f4027738809 - diverges::h2266b4c4b850236beaa
-   6:     0x7f40277389e5 - main::h19bb1149c2f00ecfBaa
-   7:     0x7f402773f514 - rt::unwind::try::try_fn::h13186883479104382231
-   8:     0x7f402773d1d8 - __rust_try
-   9:     0x7f402773f201 - rt::lang_start::ha172a3ce74bb453aK5w
-  10:     0x7f4027738a19 - main
-  11:     0x7f402694ab44 - __libc_start_main
-  12:     0x7f40277386c8 - <unknown>
-  13:                0x0 - <unknown>
-```
-
-A diverging function can be used as any type:
+Because this function will cause a crash, it will never return, and so it has
+the type ‘`!`’, which is read ‘diverges’. A diverging function can be used
+as any type:
 
 ```should_panic
 # fn diverges() -> ! {

branches/beta/src/doc/trpl/trait-objects.md

@@ -300,41 +300,3 @@ let y = TraitObject {
 // y.method();
 (y.vtable.method)(y.data);
 ```
-
-## Object Safety
-
-Not every trait can be used to make a trait object. For example, vectors implement
-`Clone`, but if we try to make a trait object:
-
-```ignore
-let v = vec![1, 2, 3];
-let o = &v as &Clone;
-```
-
-We get an error:
-
-```text
-error: cannot convert to a trait object because trait `core::clone::Clone` is not object-safe [E0038]
-let o = &v as &Clone;
-        ^~
-note: the trait cannot require that `Self : Sized`
-let o = &v as &Clone;
-        ^~
-```
-
-The error says that `Clone` is not ‘object-safe’. Only traits that are
-object-safe can be made into trait objects. A trait is object-safe if both of
-these are true:
-
-* the trait does not require that `Self: Sized`
-* all of its methods are object-safe
-
-So what makes a method object-safe? Each method must require that `Self: Sized`
-or all of the following:
-
-* must not have any type parameters
-* must not use `Self`
-
-Whew! As we can see, almost all of these rules talk about `Self`. A good intuition
-is “except in special circumstances, if your trait’s method uses `Self`, it is not
-object-safe.”

branches/beta/src/libcollections/binary_heap.rs

@@ -112,7 +112,7 @@
 //!     //                  7
 //!     //          +-----------------+
 //!     //          |                 |
-//!     //          v   1        2    |  2
+//!     //          v   1        2    |
 //!     //          0 -----> 1 -----> 3 ---> 4
 //!     //          |        ^        ^      ^
 //!     //          |        | 1      |      |