From 4241376379993e0d4713df80d6c37973ed202440 Mon Sep 17 00:00:00 2001
From: Kishikawa Katsumi <kishikawakatsumI@mac.com>
Date: Wed, 12 Apr 2023 15:46:36 +0900
Subject: [PATCH] =?UTF-8?q?Fix=20escape=20handling=20to=20include=20the=20?=
 =?UTF-8?q?emoji=20`#=EF=B8=8F=E2=83=A3`=20when=20counting=20`#`=20charact?=
 =?UTF-8?q?ers=20in=20string=20literals?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 Sources/SwiftSyntaxBuilder/ConvenienceInitializers.swift | 2 +-
 Tests/SwiftSyntaxBuilderTest/StringLiteralTests.swift    | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/Sources/SwiftSyntaxBuilder/ConvenienceInitializers.swift b/Sources/SwiftSyntaxBuilder/ConvenienceInitializers.swift
index 745f9e8a545..0d1335fd36e 100644
--- a/Sources/SwiftSyntaxBuilder/ConvenienceInitializers.swift
+++ b/Sources/SwiftSyntaxBuilder/ConvenienceInitializers.swift
@@ -249,7 +249,7 @@ extension StringLiteralExprSyntax {
         continue
 
       // Special mode: counting a sequence of pounds until we reach its end.
-      case (true, "#"):
+      case (true, _) where c.unicodeScalars.contains("#"):
         consecutivePounds += 1
         maxPounds = max(maxPounds, consecutivePounds)
       case (true, _):
diff --git a/Tests/SwiftSyntaxBuilderTest/StringLiteralTests.swift b/Tests/SwiftSyntaxBuilderTest/StringLiteralTests.swift
index 2311fbcd50a..76da43a3cf3 100644
--- a/Tests/SwiftSyntaxBuilderTest/StringLiteralTests.swift
+++ b/Tests/SwiftSyntaxBuilderTest/StringLiteralTests.swift
@@ -71,6 +71,15 @@ final class StringLiteralTests: XCTestCase {
     )
   }
 
+  func testEscapePoundEmojis() {
+    assertBuildResult(
+      StringLiteralExprSyntax(content: ##"foo"#️⃣"bar"##),
+      """
+      ##"foo"#️⃣"bar"##
+      """
+    )
+  }
+
   func testEscapeInteropolation() {
     assertBuildResult(
       StringLiteralExprSyntax(content: ###"\##(foobar)\#(foobar)"###),