diff options
| -rw-r--r-- | compiler/rustc_query_impl/src/on_disk_cache.rs | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/compiler/rustc_query_impl/src/on_disk_cache.rs b/compiler/rustc_query_impl/src/on_disk_cache.rs index f9456a6f2cd..cb50c851e9a 100644 --- a/compiler/rustc_query_impl/src/on_disk_cache.rs +++ b/compiler/rustc_query_impl/src/on_disk_cache.rs @@ -86,8 +86,10 @@ pub struct OnDiskCache<'sess> { expn_data: UnhashMap<ExpnHash, AbsoluteBytePos>, // Additional information used when decoding hygiene data. hygiene_context: HygieneDecodeContext, - // FIXME(mw): Update this comment: - // Likewise for ExpnId. + // Maps `ExpnHash`es to their raw value from the *previous* + // compilation session. This is used as an initial 'guess' when + // we try to map an `ExpnHash` to its value in the current + // compilation session. foreign_expn_data: UnhashMap<ExpnHash, u32>, } |