fn vertices_awaiting_deps_len(&self) -> u64 {
        self.vertices_awaiting_deps
            .iter()
            .map(|(_, pv)| pv.len())
            .sum()
    }
// Returns number of elements in `vertex_deps` queue.
Returns number of elements in `vertex_deps` queue.
Returns number of elements in ` vertex_deps ` queue .
fn vertices_awaiting_deps_len(&self) -> u64 {
        self.vertices_awaiting_deps
            .iter()
            .map(|(_, pv)| pv.len())
            .sum()
    }
fn vertices_awaiting_deps_len ( & self ) -> u64 { self . vertices_awaiting_deps . iter ( ) . map ( | ( _ , pv ) | pv . len ( ) ) . sum ( ) }
Returns number of elements in `vertex_deps` queue.
Returns number of elements in ` vertex_deps ` queue .
&self
&self