diff options
Diffstat (limited to 'compiler/rustc_next_trait_solver/src/solve/mod.rs')
| -rw-r--r-- | compiler/rustc_next_trait_solver/src/solve/mod.rs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/rustc_next_trait_solver/src/solve/mod.rs b/compiler/rustc_next_trait_solver/src/solve/mod.rs index a2db21796a2..91b83e6cbbe 100644 --- a/compiler/rustc_next_trait_solver/src/solve/mod.rs +++ b/compiler/rustc_next_trait_solver/src/solve/mod.rs @@ -418,6 +418,11 @@ pub struct GoalEvaluation<I: Interner> { pub has_changed: HasChanged, /// If the [`Certainty`] was `Maybe`, then keep track of whether the goal has changed /// before rerunning it. + /// + /// We knowingly ignore the `sub_root` of our inference variables here. This means we + /// may not reevaluate a goal even though a change to the `sub_root` could cause a goal + /// to make progress. Tracking them adds additional complexity for an incredibly minor + /// type inference improvement. We could look into properly handling this in the future. pub stalled_on: Option<GoalStalledOn<I>>, } |