fix patch assignment to pointer values

change_value.go

@@ -108,8 +108,10 @@ func (c *ChangeValue) Set(value reflect.Value, convertCompatibleTypes bool) {
 			if r := recover(); r != nil {
 				c.AddError(NewError(r.(string)))
 				c.SetFlag(FlagFailed)
+
 			}
 		}()
+
 		if c.HasFlag(OptionImmutable) {
 			c.SetFlag(FlagIgnored)
 			return
@@ -124,7 +126,13 @@ func (c *ChangeValue) Set(value reflect.Value, convertCompatibleTypes bool) {
 			c.target.Set(value.Convert(c.target.Type()))
 		} else {
 			if value.IsValid() {
-				c.target.Set(value)
+				if c.target.Kind() == reflect.Ptr && value.Kind() != reflect.Ptr {
+					tv := reflect.New(value.Type())
+					tv.Elem().Set(value)
+					c.target.Set(tv)
+				} else {
+					c.target.Set(value)
+				}
 			} else if !c.target.IsZero() {
 				t := c.target.Elem()
 				t.Set(reflect.Zero(t.Type()))

patch_test.go

@@ -285,3 +285,21 @@ func TestPatch(t *testing.T) {
 		require.Equal(t, len(cl), len(pl))
 	})
 }
+
+func TestPatchPointer(t *testing.T) {
+	type tps struct {
+		S *string
+	}
+
+	str1 := "before"
+	str2 := "after"
+
+	t1 := tps{S: &str1}
+	t2 := tps{S: &str2}
+
+	changelog, err := diff.Diff(t1, t2)
+	assert.NoError(t, err)
+
+	patchLog := diff.Patch(changelog, &t1)
+	assert.False(t, patchLog.HasErrors())
+}