Fix an infinite recursion error exposed by #3440 (#3444)

diff --git a/src/black/linegen.py b/src/black/linegen.py
index 91223747618ea0c700318a6a00fb2621a7007597..fe6ea11c501abba9f2116f15a08c40d8880ac1af 100644 (file)
--- a/src/black/linegen.py
+++ b/src/black/linegen.py
@@ -1417,8 +1417,10 @@ def run_transformer(
 
         result.extend(transform_line(transformed_line, mode=mode, features=features))
 
+    features_set = set(features)
     if (
-        transform.__class__.__name__ != "rhs"
+        Feature.FORCE_OPTIONAL_PARENTHESES in features_set
+        or transform.__class__.__name__ != "rhs"
         or not line.bracket_tracker.invisible
         or any(bracket.value for bracket in line.bracket_tracker.invisible)
         or line.contains_multiline_strings()
@@ -1435,7 +1437,7 @@ def run_transformer(
 
     line_copy = line.clone()
     append_leaves(line_copy, line, line.leaves)
-    features_fop = set(features) | {Feature.FORCE_OPTIONAL_PARENTHESES}
+    features_fop = features_set | {Feature.FORCE_OPTIONAL_PARENTHESES}
     second_opinion = run_transformer(
         line_copy, transform, mode, features_fop, line_str=line_str
     )

diff --git a/tests/data/preview/long_dict_values.py b/tests/data/preview/long_dict_values.py
index f23c5d3dad154113362c999781613117f842b724..4c515180028f1300a52f51a9298e1d1f11fce172 100644 (file)
--- a/tests/data/preview/long_dict_values.py
+++ b/tests/data/preview/long_dict_values.py
@@ -17,6 +17,24 @@ my_dict = {
     "a key in my dict": MyClass.some_attribute.first_call().second_call().third_call(some_args="some value")
 }
 
+{
+    'xxxxxx':
+        xxxxxxxxxxxxxxxxxxx.xxxxxxxxxxxxxx(
+            xxxxxxxxxxxxxx={
+                'x':
+                    xxxxxxxxxxxxxxxxxxxxxxxxxx.xxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
+                        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=(
+                            xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+                            .xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
+                                xxxxxxxxxxxxx=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+                                .xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
+                                    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx={
+                                        'x': x.xx,
+                                        'x': x.x,
+                                    }))))
+            }),
+}
+
 
 # output
 
@@ -51,3 +69,22 @@ my_dict = {
         .third_call(some_args="some value")
     )
 }
+
+{
+    "xxxxxx": xxxxxxxxxxxxxxxxxxx.xxxxxxxxxxxxxx(
+        xxxxxxxxxxxxxx={
+            "x": xxxxxxxxxxxxxxxxxxxxxxxxxx.xxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
+                xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=(
+                    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
+                        xxxxxxxxxxxxx=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
+                            xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx={
+                                "x": x.xx,
+                                "x": x.x,
+                            }
+                        )
+                    )
+                )
+            )
+        }
+    ),
+}