pub trait HashStableContext:
    HashStableContext
    + HashStableContext
    + HashStableContext {
    // Required method
    fn hash_attr_id(
        &mut self,
        id: &HashIgnoredAttrId,
        hasher: &mut StableHasher,
    );
}Expand description
Requirements for a StableHashingContext to be used in this crate.
This is a hack to allow using the HashStable_Generic derive macro
instead of implementing everything in rustc_middle.