Move predicate normalization in constraint solver for better debugging

Author: vl0w

prusti-viper/src/encoder/mir/specifications/constraints.rs

@@ -161,15 +161,7 @@ pub mod trait_bounds {
         let all_bounds_satisfied = param_env_constraint
             .caller_bounds()
             .iter()
-            .all(|predicate| {
-                // Normalize any associated type projections.
-                // This needs to be done because ghost constraints might contain "deeply nested"
-                // associated types, e.g. `T: A<SomeAssocType = <Self as B>::OtherAssocType`
-                // where `<Self as B>::OtherAssocType` can be normalized to some concrete type.
-                let normalized_predicate = env.normalize_to(predicate);
-
-                env.evaluate_predicate(normalized_predicate, param_env_lookup)
-            });
+            .all(|predicate| env.evaluate_predicate(predicate, param_env_lookup));
 
         trace!("Constraint fulfilled: {all_bounds_satisfied}");
         all_bounds_satisfied
@@ -208,6 +200,14 @@ pub mod trait_bounds {
             param_env
         );
 
+        // Normalize any associated type projections.
+        // This needs to be done because ghost constraints might contain "deeply nested"
+        // associated types, e.g. `T: A<SomeAssocType = <Self as B>::OtherAssocType`
+        // where `<Self as B>::OtherAssocType` can be normalized to some concrete type.
+        let param_env = env.normalize_to(param_env);
+
+        trace!("Constraints after normalization: {:#?}", param_env);
+
         param_env
     }