def _nt_eof
start_index = index
if node_cache[:eof].has_key?(index)
cached = node_cache[:eof][index]
@index = cached.interval.end if cached
return cached
end
i0 = index
if index < input_length
next_character = index + input[index..-1].match(/\A(.)/um).end(1)
r1 = instantiate_node(SyntaxNode,input, index...next_character)
@index = next_character
else
terminal_parse_failure("any character")
r1 = nil
end
if r1
r0 = nil
else
@index = i0
r0 = instantiate_node(SyntaxNode,input, index...index)
end
node_cache[:eof][start_index] = r0
r0
end