revert one change from rustc_next_trait_solver

Author: estebank

compiler/rustc_next_trait_solver/src/lib.rs

@@ -8,7 +8,6 @@
 #![allow(rustc::direct_use_of_rustc_type_ir)]
 #![allow(rustc::usage_of_type_ir_inherent)]
 #![allow(rustc::usage_of_type_ir_traits)]
-#![deny(clippy::manual_let_else)]
 // tidy-alphabetical-end
 
 pub mod canonical;

compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs

@@ -810,16 +810,18 @@ where
     pub(super) fn term_is_fully_unconstrained(&self, goal: Goal<I, ty::NormalizesTo<I>>) -> bool {
         let universe_of_term = match goal.predicate.term.kind() {
             ty::TermKind::Ty(ty) => {
-                let ty::Infer(ty::TyVar(vid)) = ty.kind() else {
+                if let ty::Infer(ty::TyVar(vid)) = ty.kind() {
+                    self.delegate.universe_of_ty(vid).unwrap()
+                } else {
                     return false;
-                };
-                self.delegate.universe_of_ty(vid).unwrap()
+                }
             }
             ty::TermKind::Const(ct) => {
-                let ty::ConstKind::Infer(ty::InferConst::Var(vid)) = ct.kind() else {
+                if let ty::ConstKind::Infer(ty::InferConst::Var(vid)) = ct.kind() {
+                    self.delegate.universe_of_ct(vid).unwrap()
+                } else {
                     return false;
-                };
-                self.delegate.universe_of_ct(vid).unwrap()
+                }
             }
         };