From 0e297eb7fb09aef8da6e00427ab1df5d77b8c5d1 Mon Sep 17 00:00:00 2001
From: Pierre Sassoulas <pierre.sassoulas@gmail.com>
Date: Mon, 12 May 2025 22:43:05 +0200
Subject: [PATCH] [fix] Crash when parsing an empty arbitrary expression with
 ``extract_node`` (#2736)

Closes #2734

(cherry picked from commit 59f36e755d04765b2b623c7c51e84509c6b248f6)
---
 ChangeLog              | 2 ++
 astroid/builder.py     | 1 +
 tests/test_regrtest.py | 6 ++++++
 3 files changed, 9 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 94d8e482b0..912c9fe203 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -13,7 +13,9 @@ What's New in astroid 3.3.11?
 =============================
 Release date: TBA
 
+* Fix a crash when parsing an empty arbitrary expression with ``extract_node`` (``extract_node("__()")``).
 
+  Closes #2734
 
 What's New in astroid 3.3.10?
 =============================
diff --git a/astroid/builder.py b/astroid/builder.py
index f4be6972b8..22724fa9af 100644
--- a/astroid/builder.py
+++ b/astroid/builder.py
@@ -317,6 +317,7 @@ def _extract_expressions(node: nodes.NodeNG) -> Iterator[nodes.NodeNG]:
         isinstance(node, nodes.Call)
         and isinstance(node.func, nodes.Name)
         and node.func.name == _TRANSIENT_FUNCTION
+        and node.args
     ):
         real_expr = node.args[0]
         assert node.parent
diff --git a/tests/test_regrtest.py b/tests/test_regrtest.py
index f7383d25fb..a7a091b93e 100644
--- a/tests/test_regrtest.py
+++ b/tests/test_regrtest.py
@@ -497,3 +497,9 @@ def _get_option(self, option):
         )
     )
     assert node.inferred()[0].value == "mystr"
+
+
+def test_regression_no_crash_during_build() -> None:
+    node: nodes.Attribute = extract_node("__()")
+    assert node.args == []
+    assert node.as_string() == "__()"