From 537f17f71a72dfae4a6c1799a7e12dc8d918108d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B6nke=20Ludwig?= <sludwig@rejectedsoftware.com>
Date: Mon, 21 Nov 2016 20:20:14 +0100
Subject: [PATCH] Add assertion error message.

---
 source/taggedalgebraic.d | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/source/taggedalgebraic.d b/source/taggedalgebraic.d
index 18a12d7..40e0ad9 100644
--- a/source/taggedalgebraic.d
+++ b/source/taggedalgebraic.d
@@ -603,7 +603,8 @@ unittest { // issue #1
 */
 ref inout(T) get(T, U)(ref inout(TaggedAlgebraic!U) ta)
 {
-	assert(hasType!(T, U)(ta));
+	import std.format : format;
+	assert(hasType!(T, U)(ta), () { scope (failure) assert(false); return format("Trying to get %s but have %s.", T.stringof, ta.kind); } ());
 	return ta.trustedGet!T;
 }