diff options
| -rw-r--r-- | compiler/rustc_middle/src/query/keys.rs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/query/keys.rs b/compiler/rustc_middle/src/query/keys.rs index a96bc115e3b..e4bb3ce3d5a 100644 --- a/compiler/rustc_middle/src/query/keys.rs +++ b/compiler/rustc_middle/src/query/keys.rs @@ -15,6 +15,14 @@ use rustc_span::{Span, DUMMY_SP}; /// The `Key` trait controls what types can legally be used as the key /// for a query. pub trait Key: Sized { + // N.B. Most of the keys down below have `type CacheSelector = DefaultCacheSelector<Self>;`, + // it would be reasonable to use associated type defaults, to remove the duplication... + // + // ...But r-a doesn't support them yet and using a default here causes r-a to not infer + // return types of queries which is very annoying. Thus, until r-a support associated + // type defaults, plese restrain from using them here <3 + // + // r-a issue: <https://github.com/rust-lang/rust-analyzer/issues/13693> type CacheSelector; /// Given an instance of this key, what crate is it referring to? |