1 files changed, 15 insertions, 6 deletions
diff --git a/compiler/rustc_hir_analysis/src/variance/constraints.rs b/compiler/rustc_hir_analysis/src/variance/constraints.rs
index 23223de918c..8123326a47f 100644
--- a/compiler/rustc_hir_analysis/src/variance/constraints.rs
+++ b/compiler/rustc_hir_analysis/src/variance/constraints.rs
@@ -251,12 +251,7 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
             }
 
             ty::Pat(typ, pat) => {
-                match *pat {
-                    ty::PatternKind::Range { start, end } => {
-                        self.add_constraints_from_const(current, start, variance);
-                        self.add_constraints_from_const(current, end, variance);
-                    }
-                }
+                self.add_constraints_from_pat(current, variance, pat);
                 self.add_constraints_from_ty(current, typ, variance);
             }
 
@@ -334,6 +329,20 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
         }
     }
 
+    fn add_constraints_from_pat(
+        &mut self,
+        current: &CurrentItem,
+        variance: VarianceTermPtr<'a>,
+        pat: ty::Pattern<'tcx>,
+    ) {
+        match *pat {
+            ty::PatternKind::Range { start, end } => {
+                self.add_constraints_from_const(current, start, variance);
+                self.add_constraints_from_const(current, end, variance);
+            }
+        }
+    }
+
     /// Adds constraints appropriate for a nominal type (enum, struct,
     /// object, etc) appearing in a context with ambient variance `variance`
     fn add_constraints_from_args(