Improve the namespacing selected by rustc used for gencode types in errors.

protobuf-github-bot · copybara-github · commit ce2eb733c7cb · 2026-03-26T13:37:29.000-07:00
We create an 'entry point' .rs file which collects all of the other files (one .rs per input .proto file) and re-emits them. Today this causes error messages that have an `internal_do_not_use` in the namespace. By pulling it in as not-pub it causes the compiler to not use the implementation-detail module in the spelling of the types in error messages.

PiperOrigin-RevId: 890019733
diff --git a/src/google/protobuf/compiler/rust/generator.cc b/src/google/protobuf/compiler/rust/generator.cc
@@ -138,10 +138,12 @@ void EmitEntryPointRsFile(GeneratorContext* generator_context,
               {"mod_name", RustInternalModuleName(*file)}},
              R"rs(
               #[path="$file_path$"]
-              #[allow(nonstandard_style, unused)]
-              pub mod internal_do_not_use_$mod_name$;
+              #[allow(nonstandard_style, unused, unreachable_pub)]
+              #[doc(hidden)]
+              mod internal_do_not_use_$mod_name$;
 
               #[allow(nonstandard_style, unused)]
+              #[doc(inline)]
               pub use internal_do_not_use_$mod_name$::*;
             )rs");
   }
