From c42c9a4e57526c1b16065ad3f6c908b87bb94811 Mon Sep 17 00:00:00 2001
From: dukc <ajieskola@gmail.com>
Date: Fri, 21 Feb 2020 18:00:19 +0200
Subject: [PATCH] Allowed copying of tagged unions containing unit values

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

diff --git a/source/taggedalgebraic/taggedunion.d b/source/taggedalgebraic/taggedunion.d
index 90bf434..9c446cb 100644
--- a/source/taggedalgebraic/taggedunion.d
+++ b/source/taggedalgebraic/taggedunion.d
@@ -39,6 +39,7 @@ align(commonAlignment!(UnionKindTypes!(UnionFieldEnum!U))) struct TaggedUnion
 {
 	import std.traits : FieldTypeTuple, FieldNameTuple, Largest,
 		hasElaborateCopyConstructor, hasElaborateDestructor, isCopyable;
+	import std.meta : templateOr;
 	import std.ascii : toUpper;
 
 	alias FieldDefinitionType = U;
@@ -104,7 +105,7 @@ align(commonAlignment!(UnionKindTypes!(UnionFieldEnum!U))) struct TaggedUnion
 	}
 
 	// postblit constructor
-	static if (!allSatisfy!(isCopyable, FieldTypes)) {
+	static if (!allSatisfy!(templateOr!(isCopyable, isUnitType), FieldTypes)) {
 		@disable this(this);
 	} else static if (anySatisfy!(hasElaborateCopyConstructor, FieldTypes)) {
 		this(this)