Ensure match/case are recognized as statements (#2665)

CHANGES.md

@@ -13,6 +13,7 @@
   `match a, *b:` (#2639) (#2659)
 - Fix `match`/`case` statements that contain `match`/`case` soft keywords multiple
   times, like `match re.match()` (#2661)
+- Fix `case` statements with an inline body (#2665)
 - Fix assignment to environment variables in Jupyter Notebooks (#2642)
 - Add `flake8-simplify` and `flake8-comprehensions` plugins (#2653)
 - Fix determination of f-string expression spans (#2654)

src/black/nodes.py

@@ -52,6 +52,8 @@
     syms.with_stmt,
     syms.funcdef,
     syms.classdef,
+    syms.match_stmt,
+    syms.case_block,
 }
 STANDALONE_COMMENT: Final = 153
 token.tok_name[STANDALONE_COMMENT] = "STANDALONE_COMMENT"

tests/data/pattern_matching_style.py

@@ -0,0 +1,27 @@
+match something:
+    case b(): print(1+1)
+    case c(
+        very_complex=True,
+        perhaps_even_loooooooooooooooooooooooooooooooooooooong=-   1
+    ): print(1)
+    case c(
+        very_complex=True,
+        perhaps_even_loooooooooooooooooooooooooooooooooooooong=-1
+    ): print(2)
+    case a: pass
+
+# output
+
+match something:
+    case b():
+        print(1 + 1)
+    case c(
+        very_complex=True, perhaps_even_loooooooooooooooooooooooooooooooooooooong=-1
+    ):
+        print(1)
+    case c(
+        very_complex=True, perhaps_even_loooooooooooooooooooooooooooooooooooooong=-1
+    ):
+        print(2)
+    case a:
+        pass

tests/test_format.py

@@ -74,6 +74,7 @@
     "pattern_matching_simple",
     "pattern_matching_complex",
     "pattern_matching_extras",
+    "pattern_matching_style",
     "parenthesized_context_managers",
 ]