Required files
treetop/compiler/node_classes/parsing_expression
treetop/compiler/node_classes/atomic_expression
treetop/compiler/node_classes/inline_module
treetop/compiler/node_classes/predicate_block
treetop/compiler/node_classes/treetop_file
treetop/compiler/node_classes/grammar
treetop/compiler/node_classes/declaration_sequence
treetop/compiler/node_classes/parsing_rule
treetop/compiler/node_classes/parenthesized_expression
treetop/compiler/node_classes/nonterminal
treetop/compiler/node_classes/terminal
treetop/compiler/node_classes/anything_symbol
treetop/compiler/node_classes/character_class
treetop/compiler/node_classes/sequence
treetop/compiler/node_classes/choice
treetop/compiler/node_classes/repetition
treetop/compiler/node_classes/optional
treetop/compiler/node_classes/predicate
treetop/compiler/node_classes/transient_prefix