As seen in hashbrown:
#[cfg(feature = "raw")]
/// Experimental and unsafe `RawTable` API. This module is only available if the
/// `raw` feature is enabled.
pub mod raw {
// The RawTable API is still experimental and is not properly documented yet.
#[allow(missing_docs)]
#[path = "mod.rs"]
mod inner;
pub use inner::*;
#[cfg(feature = "rayon")]
pub mod rayon {
pub use crate::external_trait_impls::rayon::raw::*;
}
}
Ideally we'd just do this when we need it, but the ostream derivation
will be controlled by both global config and per-structure config, so
it's hard to know exactly when we need it and when we don't.
By checking the recursion depth in the crate we are currently parsing,
we can decide on the right module directory to find submodules in. The
added `mod_2018` test fails without the changes to `parser.rs`.