process_call (R2CRewriter)

    # File lib/rewriter.rb, line 351
      def process_call(exp)
        lhs = process exp.shift
        name = exp.shift
        rhs = process exp.shift

        lhs_type = lhs.sexp_type rescue nil
        type_signature = [lhs_type, name]
        type_signature += rhs[1..-1].map { |sexp| sexp.sexp_type } unless rhs.nil?

        result = if REWRITES.has_key? type_signature then
                   REWRITES[type_signature].call(lhs, name, rhs)
                 else
                   t(:call, lhs, name, rhs, exp.sexp_type)
                 end

        return result
      end