diff --git a/compiler/rustc_data_structures/src/obligation_forest/mod.rs b/compiler/rustc_data_structures/src/obligation_forest/mod.rs
index d477b86da74e8..c9e9e7e52aaec 100644
--- a/compiler/rustc_data_structures/src/obligation_forest/mod.rs
+++ b/compiler/rustc_data_structures/src/obligation_forest/mod.rs
@@ -146,7 +146,25 @@ pub enum ProcessResult<O, E> {
 #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 struct ObligationTreeId(usize);
 
-type ObligationTreeIdGenerator = impl Iterator<Item = ObligationTreeId>;
+use uwu::*;
+
+mod uwu {
+    use super::*;
+    pub type ObligationTreeIdGenerator = impl Iterator<Item = ObligationTreeId>;
+
+    impl<O: ForestObligation> ObligationForest<O> {
+        pub fn new() -> ObligationForest<O> {
+            ObligationForest {
+                nodes: vec![],
+                done_cache: Default::default(),
+                active_cache: Default::default(),
+                reused_node_vec: vec![],
+                obligation_tree_id_generator: (0..).map(ObligationTreeId),
+                error_cache: Default::default(),
+            }
+        }
+    }
+}
 
 pub struct ObligationForest<O: ForestObligation> {
     /// The list of obligations. In between calls to [Self::process_obligations],
@@ -311,17 +329,6 @@ pub struct Error<O, E> {
 }
 
 impl<O: ForestObligation> ObligationForest<O> {
-    pub fn new() -> ObligationForest<O> {
-        ObligationForest {
-            nodes: vec![],
-            done_cache: Default::default(),
-            active_cache: Default::default(),
-            reused_node_vec: vec![],
-            obligation_tree_id_generator: (0..).map(ObligationTreeId),
-            error_cache: Default::default(),
-        }
-    }
-
     /// Returns the total number of nodes in the forest that have not
     /// yet been fully resolved.
     pub fn len(&self) -> usize {
diff --git a/compiler/rustc_trait_selection/src/solve/assembly/mod.rs b/compiler/rustc_trait_selection/src/solve/assembly/mod.rs
index 84bf79ba6879a..c1a8fd033fa79 100644
--- a/compiler/rustc_trait_selection/src/solve/assembly/mod.rs
+++ b/compiler/rustc_trait_selection/src/solve/assembly/mod.rs
@@ -846,12 +846,16 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
         if let Some(result) = self.try_merge_responses(&responses) {
             return Ok(result);
         } else {
-            let param_env_candidates = candidates.iter().filter(|c| matches!(c.source, CandidateSource::ParamEnv(_))).map(|c| c.result).collect::<Vec<_>>();
+            let param_env_candidates = candidates
+                .iter()
+                .filter(|c| matches!(c.source, CandidateSource::ParamEnv(_)))
+                .map(|c| c.result)
+                .collect::<Vec<_>>();
             if let Some(result) = self.try_merge_responses(&param_env_candidates) {
                 return Ok(result);
             } else {
                 self.flounder(&responses)
             }
-        }   
+        }
     }
 }
diff --git a/compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs b/compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs
index f40a69282d4de..168a7a68da9ad 100644
--- a/compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs
+++ b/compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs
@@ -19,8 +19,8 @@ use rustc_infer::infer::canonical::query_response::make_query_region_constraints
 use rustc_infer::infer::canonical::CanonicalVarValues;
 use rustc_infer::infer::canonical::{CanonicalExt, QueryRegionConstraints};
 use rustc_infer::infer::resolve::EagerResolver;
+use rustc_infer::infer::InferCtxt;
 use rustc_infer::infer::RegionVariableOrigin;
-use rustc_infer::infer::{InferCtxt,};
 use rustc_infer::traits::solve::NestedNormalizationGoals;
 use rustc_middle::infer::canonical::Canonical;
 use rustc_middle::traits::query::NoSolution;
diff --git a/compiler/rustc_trait_selection/src/traits/mod.rs b/compiler/rustc_trait_selection/src/traits/mod.rs
index 4f5d7b9edce38..cf5af5592c124 100644
--- a/compiler/rustc_trait_selection/src/traits/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/mod.rs
@@ -395,7 +395,12 @@ pub fn normalize_param_env_or_error<'tcx>(
                 let infcx = tcx.infer_ctxt().build();
                 let ocx = ObligationCtxt::new(&infcx);
                 let param_env = ty::ParamEnv::empty();
-                ocx.register_obligation(Obligation::new(tcx, ObligationCause::dummy(), param_env, p));
+                ocx.register_obligation(Obligation::new(
+                    tcx,
+                    ObligationCause::dummy(),
+                    param_env,
+                    p,
+                ));
                 if !ocx.select_all_or_error().is_empty() {
                     true
                 } else if ocx.resolve_regions(&OutlivesEnvironment::new(param_env)).is_empty() {