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-rw-r--r--compiler/rustc_trait_selection/src/solve/opaques.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/rustc_trait_selection/src/solve/opaques.rs b/compiler/rustc_trait_selection/src/solve/opaques.rs
index 2e537d1c358..f08adc0208b 100644
--- a/compiler/rustc_trait_selection/src/solve/opaques.rs
+++ b/compiler/rustc_trait_selection/src/solve/opaques.rs
@@ -1,3 +1,6 @@
+//! Computes a normalizes-to (projection) goal for opaque types. This goal
+//! behaves differently depending on the param-env's reveal mode and whether
+//! the opaque is in a defining scope.
 use rustc_middle::traits::query::NoSolution;
 use rustc_middle::traits::solve::{Certainty, Goal, QueryResult};
 use rustc_middle::traits::Reveal;