Fix parsing of walrus operator in complex with statements (#4630)

CHANGES.md

@@ -10,6 +10,8 @@
 
 <!-- Changes that affect Black's stable style -->
 - Fix crash while formatting a long `del` statement containing tuples (#4628)
+- Fix crash while formatting expressions using the walrus operator in complex
+  `with` statements (#4630)
 
 ### Preview style
 

src/black/linegen.py

@@ -1649,6 +1649,7 @@ def maybe_make_parens_invisible_in_atom(
             syms.except_clause,
             syms.funcdef,
             syms.with_stmt,
+            syms.testlist_gexp,
             syms.tname,
             # these ones aren't useful to end users, but they do please fuzzers
             syms.for_stmt,

tests/data/cases/pep_572_py310.py

@@ -14,3 +14,8 @@
 f((a := b + c for c in range(10)), x)
 f(y=(a := b + c for c in range(10)))
 f(x, (a := b + c for c in range(10)), y=z, **q)
+
+
+# Don't remove parens when assignment expr is one of the exprs in a with statement
+with x, (a := b):
+    pass