fix: #[doc(hidden)] plumbing module (#781)

Author: Veykril

src/lib.rs

@@ -64,6 +64,7 @@ pub mod prelude {
 /// # WARNING
 ///
 /// The contents of this module are NOT subject to semver.
+#[doc(hidden)]
 pub mod plumbing {
     pub use std::any::TypeId;
     pub use std::option::Option::{self, None, Some};

tests/compile-fail/specify-does-not-work-if-the-key-is-a-salsa-input.stderr

@@ -5,7 +5,7 @@ error[E0277]: the trait bound `MyInput: TrackedStructInDb` is not satisfied
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `TrackedStructInDb` is not implemented for `MyInput`
    |
    = help: the trait `TrackedStructInDb` is implemented for `MyTracked<'_>`
-note: required by a bound in `salsa::function::specify::<impl salsa::plumbing::function::IngredientImpl<C>>::specify_and_record`
+note: required by a bound in `salsa::function::specify::<impl salsa::function::IngredientImpl<C>>::specify_and_record`
   --> src/function/specify.rs
    |
    |     pub fn specify_and_record<'db>(&'db self, db: &'db C::DbView, key: Id, value: C::Output<'db>)

tests/compile-fail/specify-does-not-work-if-the-key-is-a-salsa-interned.stderr

@@ -5,7 +5,7 @@ error[E0277]: the trait bound `MyInterned<'_>: TrackedStructInDb` is not satisfi
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `TrackedStructInDb` is not implemented for `MyInterned<'_>`
    |
    = help: the trait `TrackedStructInDb` is implemented for `MyTracked<'_>`
-note: required by a bound in `salsa::function::specify::<impl salsa::plumbing::function::IngredientImpl<C>>::specify_and_record`
+note: required by a bound in `salsa::function::specify::<impl salsa::function::IngredientImpl<C>>::specify_and_record`
   --> src/function/specify.rs
    |
    |     pub fn specify_and_record<'db>(&'db self, db: &'db C::DbView, key: Id, value: C::Output<'db>)