From 56a724644b1ad9cb03745c10cca732715cdc79e9 Mon Sep 17 00:00:00 2001
From: Sigurd Spieckermann <sigurd.spieckermann@gmail.com>
Date: Fri, 26 May 2023 14:32:36 +0200
Subject: [PATCH] fix f-string syntax error in code generation

---
 src/jinja2/compiler.py |  7 ++++++-
 tests/test_compile.py  | 19 +++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

Index: Jinja2-3.1.2/src/jinja2/compiler.py
===================================================================
--- Jinja2-3.1.2.orig/src/jinja2/compiler.py
+++ Jinja2-3.1.2/src/jinja2/compiler.py
@@ -1122,9 +1122,14 @@ class CodeGenerator(NodeVisitor):
             )
             self.writeline(f"if {frame.symbols.ref(alias)} is missing:")
             self.indent()
+            # The position will contain the template name, and will be formatted
+            # into a string that will be compiled into an f-string. Curly braces
+            # in the name must be replaced with escapes so that they will not be
+            # executed as part of the f-string.
+            position = self.position(node).replace("{", "{{").replace("}", "}}")
             message = (
                 "the template {included_template.__name__!r}"
-                f" (imported on {self.position(node)})"
+                f" (imported on {position})"
                 f" does not export the requested name {name!r}"
             )
             self.writeline(
Index: Jinja2-3.1.2/tests/test_compile.py
===================================================================
--- Jinja2-3.1.2.orig/tests/test_compile.py
+++ Jinja2-3.1.2/tests/test_compile.py
@@ -1,6 +1,9 @@
 import os
 import re
 
+import pytest
+
+from jinja2 import UndefinedError
 from jinja2.environment import Environment
 from jinja2.loaders import DictLoader
 
@@ -26,3 +29,19 @@ def test_import_as_with_context_determin
     expect = [f"'bar{i}': " for i in range(10)]
     found = re.findall(r"'bar\d': ", content)[:10]
     assert found == expect
+
+
+def test_undefined_import_curly_name():
+    env = Environment(
+        loader=DictLoader(
+            {
+                "{bad}": "{% from 'macro' import m %}{{ m() }}",
+                "macro": "",
+            }
+        )
+    )
+
+    # Must not raise `NameError: 'bad' is not defined`, as that would indicate
+    # that `{bad}` is being interpreted as an f-string. It must be escaped.
+    with pytest.raises(UndefinedError):
+        env.get_template("{bad}").render()