Update non_expressive_names for or patterns

Author: matthewjasper

clippy_lints/src/non_expressive_names.rs

@@ -136,6 +136,9 @@ impl<'a, 'tcx, 'b> Visitor<'tcx> for SimilarNamesNameVisitor<'a, 'tcx, 'b> {
                     }
                 }
             },
+            // just go through the first pattern, as either all patterns
+            // bind the same bindings or rustc would have errored much earlier
+            PatKind::Or(ref pats) => self.visit_pat(&pats[0]),
             _ => walk_pat(self, pat),
         }
     }
@@ -325,8 +328,6 @@ impl<'a, 'tcx> Visitor<'tcx> for SimilarNamesLocalVisitor<'a, 'tcx> {
         self.single_char_names.push(vec![]);
 
         self.apply(|this| {
-            // just go through the first pattern, as either all patterns
-            // bind the same bindings or rustc would have errored much earlier
             SimilarNamesNameVisitor(this).visit_pat(&arm.pat);
             this.apply(|this| walk_expr(this, &arm.body));
         });