From 9255707dd4a51ffdb308820b879675a7d19224d8 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Thu, 29 Dec 2022 20:16:30 -0500
Subject: [PATCH] Fix detecting multiple pattern defaults

---
 src/V3Width.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index 5d12744f7..94629c128 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -3732,13 +3732,14 @@ private:
                 }
             }
             AstPatMember* defaultp = nullptr;
-            for (AstPatMember* patp = VN_AS(nodep->itemsp(), PatMember); patp;
-                 patp = VN_AS(patp->nextp(), PatMember)) {
+            for (AstPatMember* patp = VN_AS(nodep->itemsp(), PatMember); patp;) {
+                AstPatMember* const nextp = VN_AS(patp->nextp(), PatMember);
                 if (patp->isDefault()) {
                     if (defaultp) nodep->v3error("Multiple '{ default: } clauses");
                     defaultp = patp;
                     patp->unlinkFrBack();
                 }
+                patp = nextp;
             }
             while (const AstConstDType* const vdtypep = VN_CAST(dtypep, ConstDType)) {
                 dtypep = vdtypep->subDTypep()->skipRefp();