From a0a641bad3d0091ce74c4245ac56f188b7aa9d13 Mon Sep 17 00:00:00 2001
From: Allan Shortlidge <shortlidge@apple.com>
Date: Tue, 29 Sep 2026 13:57:23 -0700
Subject: [PATCH] Mark RegexComponent conformances of stdlib types @retroactive

Silences warnings about retroactive conformances of `String`, `Substring`,
`Character`, and `Unicode.Scalar` to `RegexComponent` in `RegexBuilder`. These
conformances are intentionally located in a separate module from the
`RegexComponent` protocol, so explicitly annotating them as retroactive is
appropriate.
---
 Sources/RegexBuilder/DSL.swift | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Sources/RegexBuilder/DSL.swift b/Sources/RegexBuilder/DSL.swift
index 7e19caae2..42266466f 100644
--- a/Sources/RegexBuilder/DSL.swift
+++ b/Sources/RegexBuilder/DSL.swift
@@ -32,21 +32,21 @@ internal protocol _BuiltinRegexComponent: RegexComponent {
 // MARK: - Primitive regex components
 
 @available(SwiftStdlib 5.7, *)
-extension String: RegexComponent {
+extension String: @retroactive RegexComponent {
   public typealias Output = Substring
 
   public var regex: Regex<Output> { .init(verbatim: self) }
 }
 
 @available(SwiftStdlib 5.7, *)
-extension Substring: RegexComponent {
+extension Substring: @retroactive RegexComponent {
   public typealias Output = Substring
 
   public var regex: Regex<Output> { String(self).regex }
 }
 
 @available(SwiftStdlib 5.7, *)
-extension Character: RegexComponent {
+extension Character: @retroactive RegexComponent {
   public typealias Output = Substring
 
   public var regex: Regex<Output> {
@@ -55,7 +55,7 @@ extension Character: RegexComponent {
 }
 
 @available(SwiftStdlib 5.7, *)
-extension UnicodeScalar: RegexComponent {
+extension UnicodeScalar: @retroactive RegexComponent {
   public typealias Output = Substring
 
   public var regex: Regex<Output> {