Auto merge of #56626 - alexcrichton:update-beta, r=pietroalbini

[beta] Swith to released bootstrap compiler

* Also update the Cargo submodule to the 1.32 branch at the same time for
a few beta fixes.
* Include beta-nominated https://github.com/rust-lang/rust/pull/56519

src/bootstrap/builder.rs

@@ -442,7 +442,8 @@ impl<'a> Builder<'a> {
                 doc::RustdocBook,
                 doc::RustByExample,
                 doc::RustcBook,
-                doc::CargoBook
+                doc::CargoBook,
+                doc::EditionGuide,
             ),
             Kind::Dist => describe!(
                 dist::Docs,

src/doc/edition-guide

@@ -1 +1 @@
-Subproject commit 850ea159d0fcf44dfbff16148faf9b5162481f89
+Subproject commit 419edb885ec1a98c0747b3907003d79e3e6b93a9

src/stage0.txt

@@ -12,7 +12,7 @@
 # source tarball for a stable release you'll likely see `1.x.0` for rustc and
 # `0.x.0` for Cargo where they were released on `date`.
 
-date: 2018-12-03
+date: 2018-12-06
 rustc: 1.31.0
 cargo: 0.32.0
 
@@ -34,4 +34,4 @@ cargo: 0.32.0
 # looking at a beta source tarball and it's uncommented we'll shortly comment it
 # out.
 
-dev: 1
+#dev: 1

src/tools/cargo

@@ -1 +1 @@
-Subproject commit 5e85ba14aaa20f8133863373404cb0af69eeef2c
+Subproject commit 1b6702f22a0dd54847684f29acd6617dd31a8479