From 46919f80bb3cb7b396901b611ca0c0ea773d3663 Mon Sep 17 00:00:00 2001
From: Henri Holopainen <henri.i.holopainen@gmail.com>
Date: Tue, 31 Oct 2023 21:18:52 +0200
Subject: [PATCH] Don't toggle printables quotes in debug f-strings

---
 src/black/trans.py | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/src/black/trans.py b/src/black/trans.py
index a3f6467cc9e..71ffa3ed4d6 100644
--- a/src/black/trans.py
+++ b/src/black/trans.py
@@ -590,11 +590,20 @@ def make_naked(string: str, string_prefix: str) -> str:
             """
             assert_is_leaf_string(string)
             if "f" in string_prefix:
-                string = _toggle_fexpr_quotes(string, QUOTE)
-                # After quotes toggling, quotes in expressions won't be escaped
-                # because quotes can't be reused in f-strings. So we can simply
-                # let the escaping logic below run without knowing f-string
-                # expressions.
+                RE_QUOTES_IN_DEBUG_F_STRING = (
+                    r"{[^[]*\[\s*[\"\']\w*[\"\']\s*\][^=}]*=[^}]*}"
+                )
+                is_debug_f_string_with_quotes = re.search(
+                    RE_QUOTES_IN_DEBUG_F_STRING, string
+                )
+                if not is_debug_f_string_with_quotes:
+                    # We don't want to toggle debug f-string quotes in the printable
+                    # part, because that would modify the AST
+                    string = _toggle_fexpr_quotes(string, QUOTE)
+                    # After quotes toggling, quotes in expressions won't be escaped
+                    # because quotes can't be reused in f-strings. So we can simply
+                    # let the escaping logic below run without knowing f-string
+                    # expressions.
 
             RE_EVEN_BACKSLASHES = r"(?:(?<!\\)(?:\\\\)*)"
             naked_string = string[len(string_prefix) + 1 : -1]