From 853358890b15cb9e809e2d4aecf731ee24508807 Mon Sep 17 00:00:00 2001
From: Georg Reinke <guelfey@gmail.com>
Date: Wed, 5 Jan 2022 19:51:37 +0100
Subject: [PATCH] fix: better error for struct without exported fields

Fixes #289.
---
 sig.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sig.go b/sig.go
index 41a0398..6b9cadb 100644
--- a/sig.go
+++ b/sig.go
@@ -102,7 +102,7 @@ func getSignature(t reflect.Type, depth *depthCounter) (sig string) {
 			}
 		}
 		if len(s) == 0 {
-			panic("empty struct")
+			panic(InvalidTypeError{t})
 		}
 		return "(" + s + ")"
 	case reflect.Array, reflect.Slice: