De-pub some rustc_expand modules.

Author: nnethercote

compiler/rustc_expand/src/lib.rs

@@ -17,25 +17,23 @@
 
 extern crate proc_macro as pm;
 
+mod build;
+mod errors;
+// FIXME(Nilstrieb) Translate macro_rules diagnostics
+#[allow(rustc::untranslatable_diagnostic)]
+mod mbe;
 mod placeholders;
 mod proc_macro_server;
 
 pub use mbe::macro_rules::compile_declarative_macro;
 pub mod base;
-pub mod build;
 pub mod config;
-pub mod errors;
 pub mod expand;
 pub mod module;
-
 // FIXME(Nilstrieb) Translate proc_macro diagnostics
 #[allow(rustc::untranslatable_diagnostic)]
 pub mod proc_macro;
 
-// FIXME(Nilstrieb) Translate macro_rules diagnostics
-#[allow(rustc::untranslatable_diagnostic)]
-pub(crate) mod mbe;
-
 // HACK(Centril, #64197): These shouldn't really be here.
 // Rather, they should be with their respective modules which are defined in other crates.
 // However, since for now constructing a `ParseSess` sorta requires `config` from this crate,