From aa73a7c961a941b8dfaac01ea8f14577011fb942 Mon Sep 17 00:00:00 2001
From: Ali Mohammad Pur <ali.mpfard@gmail.com>
Date: Fri, 17 Nov 2023 21:39:56 +0330
Subject: [PATCH] Shell: Accept null heredocs in POSIX mode

Fixes #21837.
---
 Userland/Shell/AST.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Userland/Shell/AST.cpp b/Userland/Shell/AST.cpp
index 54850e0cab..fc7e836245 100644
--- a/Userland/Shell/AST.cpp
+++ b/Userland/Shell/AST.cpp
@@ -1425,6 +1425,10 @@ ErrorOr<void> Heredoc::dump(int level) const
 
 ErrorOr<RefPtr<Value>> Heredoc::run(RefPtr<Shell> shell)
 {
+    if (shell && shell->posix_mode() && !m_contents) {
+        m_contents = make_ref_counted<StringLiteral>(position(), ""_string, StringLiteral::EnclosureType::None);
+    }
+
     if (!m_contents) {
         if (shell)
             shell->raise_error(Shell::ShellError::EvaluatedSyntaxError, "Attempt to evaluate an unresolved heredoc"sv, position());