Rollup merge of rust-lang#107168 - Nilstrieb:if-a-tait-falls-in-the-f…

…orest,can-we-know-it-wasnt-revealed, r=oli-obk Use a type-alias-impl-trait in `ObligationForest`
matthiaskrgr · Jan 26, 2023 · bde6876 · bde6876
2 parents 4d0bd4a + f74ca88
commit bde6876
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/compiler/rustc_data_structures/src/obligation_forest/mod.rs b/compiler/rustc_data_structures/src/obligation_forest/mod.rs
@@ -139,8 +139,7 @@ pub enum ProcessResult<O, E> {
 #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 struct ObligationTreeId(usize);
 
-type ObligationTreeIdGenerator =
-    std::iter::Map<std::ops::RangeFrom<usize>, fn(usize) -> ObligationTreeId>;
+type ObligationTreeIdGenerator = impl Iterator<Item = ObligationTreeId>;
 
 pub struct ObligationForest<O: ForestObligation> {
     /// The list of obligations. In between calls to [Self::process_obligations],