mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-24 22:17:08 +00:00
37849643c6
Foreign maps are used to cache external DefIds, typically backed by metadata decoding. In the future we might skip caching `V` there (since loading from metadata usually is already cheap enough), but for now this cuts down on the impact to memory usage and time to None-init a bunch of memory. Foreign data is usually much sparser, since we're not usually loading *all* entries from the foreign crate(s).