From 5c6e534ea901a16888b81c93d09cc86662ed353b Mon Sep 17 00:00:00 2001
From: Stephen Celis <stephen@stephencelis.com>
Date: Tue, 13 Dec 2022 11:42:11 -0500
Subject: [PATCH] Support `ExpressibleByNilLiteral`

Just for discussion for now. The use case seems appropriate, but given
optional promotion in the language, maybe it's best to avoid potential
type-checking issues.
---
 Sources/Tagged/Tagged.swift | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Sources/Tagged/Tagged.swift b/Sources/Tagged/Tagged.swift
index e3d57aa..c861b33 100644
--- a/Sources/Tagged/Tagged.swift
+++ b/Sources/Tagged/Tagged.swift
@@ -147,6 +147,12 @@ extension Tagged: ExpressibleByIntegerLiteral where RawValue: ExpressibleByInteg
   }
 }
 
+extension Tagged: ExpressibleByNilLiteral where RawValue: ExpressibleByNilLiteral {
+  public init(nilLiteral: ()) {
+    self.init(rawValue: RawValue(nilLiteral: nilLiteral))
+  }
+}
+
 extension Tagged: ExpressibleByStringLiteral where RawValue: ExpressibleByStringLiteral {
   public typealias StringLiteralType = RawValue.StringLiteralType