nvim-treesitter/runtime/queries/pony/folds.scm

[
  (use_statement)
  (actor_definition)
  (class_definition)
  (primitive_definition)
  (interface_definition)
  (trait_definition)
  (struct_definition)
  (constructor)
  (method)
  (behavior)
  (parameters)
  (type)
  (if_statement)
  (iftype_statement)
  (elseif_block)
  (elseiftype_block)
  (else_block)
  (for_statement)
  (while_statement)
  (try_statement)
  (with_statement)
  (repeat_statement)
  (recover_statement)
  (match_statement)
  (case_statement)
  (parenthesized_expression)
  (tuple_expression)
  (array_literal)
  (object_literal)
  (string)
  (block_comment)
] @fold