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Fix feature detection for positional-only arguments in lambdas (#2532)
authorZac Hatfield-Dodds <zac.hatfield.dodds@gmail.com>
Tue, 12 Oct 2021 04:45:58 +0000 (15:45 +1100)
committerGitHub <noreply@github.com>
Tue, 12 Oct 2021 04:45:58 +0000 (21:45 -0700)
CHANGES.md
src/black/__init__.py
tests/test_black.py

index f5b11de48032bfb2712a52593b3495bfe1ef76a4..864f0a54410b33cadeaa8ee9b2a5d3817aa9c9d1 100644 (file)
@@ -5,6 +5,7 @@
 ### _Black_
 
 - Add new `--workers` parameter (#2514)
+- Fixed feature detection for positional-only arguments in lambdas (#2532)
 - Bumped typed-ast version minimum to 1.4.3 for 3.10 compatiblity (#2519)
 
 ### _Blackd_
index 83a39234d38d1fd0ac3e506f187b022cb31d542b..fdbaf040d642b0a41d15d0f98112090971425643 100644 (file)
@@ -1123,7 +1123,11 @@ def get_features_used(node: Node) -> Set[Feature]:
                 features.add(Feature.NUMERIC_UNDERSCORES)
 
         elif n.type == token.SLASH:
-            if n.parent and n.parent.type in {syms.typedargslist, syms.arglist}:
+            if n.parent and n.parent.type in {
+                syms.typedargslist,
+                syms.arglist,
+                syms.varargslist,
+            }:
                 features.add(Feature.POS_ONLY_ARGUMENTS)
 
         elif n.type == token.COLONEQUAL:
index f25db1b73d1ef9b102cce37ae1c89fe3566efbb4..beb56cf1fdb24bde7256366f0aa1ebf7acb23f60 100644 (file)
@@ -805,6 +805,10 @@ class BlackTestCase(BlackBaseTestCase):
         self.assertEqual(black.get_features_used(node), set())
         node = black.lib2to3_parse(expected)
         self.assertEqual(black.get_features_used(node), set())
+        node = black.lib2to3_parse("lambda a, /, b: ...")
+        self.assertEqual(black.get_features_used(node), {Feature.POS_ONLY_ARGUMENTS})
+        node = black.lib2to3_parse("def fn(a, /, b): ...")
+        self.assertEqual(black.get_features_used(node), {Feature.POS_ONLY_ARGUMENTS})
 
     def test_get_future_imports(self) -> None:
         node = black.lib2to3_parse("\n")