class Prism::Translation::Parser::Compiler

def procarg0?(parameters)

other parameters.
when given arrays if they have a single required parameter and no
Blocks can have a special set of parameters that automatically expand 
def procarg0?(parameters)
  parameters &&
    parameters.requireds.length == 1 &&
    parameters.optionals.empty? &&
    parameters.rest.nil? &&
    parameters.posts.empty? &&
    parameters.keywords.empty? &&
    parameters.keyword_rest.nil? &&
    parameters.block.nil?
end