Add some comments on potential improvements.

Cython/Compiler/ParseTreeTransforms.pxd

@@ -70,6 +70,9 @@ cdef class CreateClosureClasses(CythonTransform):
     cdef create_class_from_scope(self, node, target_module_scope, inner_node=*)
     cdef find_entries_used_in_closures(self, node)
 
+#cdef class InjectGilHandling(VisitorTransform, SkipDeclarations):
+#    cdef bint nogil
+
 cdef class GilCheck(VisitorTransform):
     cdef list env_stack
     cdef bint nogil

Cython/Compiler/ParseTreeTransforms.py

@@ -2795,6 +2795,10 @@ class InjectGilHandling(VisitorTransform, SkipDeclarations):
             node = Nodes.GILStatNode(node.pos, state='gil', body=node)
         return node
 
+    # further candidates:
+    # def visit_AssertStatNode(self, node):
+    # def visit_ReraiseStatNode(self, node):
+
     # nogil tracking
 
     def visit_GILStatNode(self, node):