-//testcase {
-// input "a*b*c";
-// output "times:{stringify:{{a}} times:{stringify:{{b}} stringify:{{c}}}}";
-// w = " "
-// l = id
-// s = l "=" r => "assign"
-// | r
-// r = l
-// | l "=" r => "assign"
-// | r "+" r => "plus"
-// | (r) "*" r => "times"
-// | "(" r ")"
-// | r r => "times"
-// id = idl++ => "stringify"
-// idl = [a-d]
-//}
-