Auto merge of #46196 - projektir:rbe-submodule, r=steveklabnik

Adding RBE as a submodule #46194

Adding RBE as a submodule to start issue #46194.

Author: bors

.gitmodules

@@ -48,3 +48,6 @@
 [submodule "src/binaryen"]
 	path = src/binaryen
 	url = https://github.com/alexcrichton/binaryen.git
+[submodule "src/doc/rust-by-example"]
+	path = src/doc/rust-by-example
+	url = https://github.com/rust-lang/rust-by-example

src/bootstrap/builder.rs

@@ -258,7 +258,7 @@ impl<'a> Builder<'a> {
             Kind::Bench => describe!(check::Crate, check::CrateLibrustc),
             Kind::Doc => describe!(doc::UnstableBook, doc::UnstableBookGen, doc::TheBook,
                 doc::Standalone, doc::Std, doc::Test, doc::Rustc, doc::ErrorIndex, doc::Nomicon,
-                doc::Reference, doc::Rustdoc, doc::CargoBook),
+                doc::Reference, doc::Rustdoc, doc::RustByExample, doc::CargoBook),
             Kind::Dist => describe!(dist::Docs, dist::Mingw, dist::Rustc, dist::DebuggerScripts,
                 dist::Std, dist::Analysis, dist::Src, dist::PlainSourceTarball, dist::Cargo,
                 dist::Rls, dist::Rustfmt, dist::Extended, dist::HashSign,

src/bootstrap/doc.rs

@@ -12,7 +12,7 @@
 //!
 //! This module implements generation for all bits and pieces of documentation
 //! for the Rust project. This notably includes suites like the rust book, the
-//! nomicon, standalone documentation, etc.
+//! nomicon, rust by example, standalone documentation, etc.
 //!
 //! Everything here is basically just a shim around calling either `rustbook` or
 //! `rustdoc`.
@@ -69,6 +69,7 @@ book!(
     Nomicon, "src/doc/nomicon", "nomicon";
     Reference, "src/doc/reference", "reference";
     Rustdoc, "src/doc/rustdoc", "rustdoc";
+    RustByExample, "src/doc/rust-by-example", "rust-by-example";
 );
 
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]