From 3e14fe48d3c33f3f985e9a6d224772c6b1338b65 Mon Sep 17 00:00:00 2001
From: Ricardo Galli <gallir@gmail.com>
Date: Mon, 25 Oct 2021 14:54:49 +0200
Subject: [PATCH] Ignore if stringer IsZero() and w.ignorezerovalue

---
 hashstructure.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hashstructure.go b/hashstructure.go
index 3dc0eb7..9bcafcf 100644
--- a/hashstructure.go
+++ b/hashstructure.go
@@ -332,6 +332,9 @@ func (w *walker) visit(v reflect.Value, opts *visitOpts) (uint64, error) {
 				if tag == "string" || w.stringer {
 					if impl, ok := innerV.Interface().(fmt.Stringer); ok {
 						innerV = reflect.ValueOf(impl.String())
+						if w.ignorezerovalue && innerV.IsZero() {
+							continue
+						}
 					} else if tag == "string" {
 						// We only show this error if the tag explicitly
 						// requests a stringer.