Trait HashStableContext 

pub trait HashStableContext {
    // Required methods
    fn span_hash_stable(&mut self, span: Span, hasher: &mut StableHasher);
    fn def_path_hash(&self, def_id: DefId) -> DefPathHash;
    fn assert_default_hashing_controls(&self, msg: &str);
}

This trait lets HashStable and derive(HashStable_Generic) be used in this crate (and other crates upstream of rustc_middle), while leaving certain operations to be defined in rustc_middle where more things are visible.

Required Methods

fn span_hash_stable(&mut self, span: Span, hasher: &mut StableHasher)

The main event: stable hashing of a span.

fn def_path_hash(&self, def_id: DefId) -> DefPathHash

Compute a DefPathHash.

fn assert_default_hashing_controls(&self, msg: &str)

Assert that the provided HashStableContext is configured with the default HashingControls. We should always have bailed out before getting to here with a

Implementors