param_table.P2 param_table.Q1
"p1"
"p2"
"p2"
"p2"
"p1"
"p2q1"
"p2q2"
variants {"p2q1"; "p2q2"}
"p2q1"
"p2q1"
"12"
"??"
\x -> case <x : param_table.Q> of {
        param_table.Q1 => "q1";
        param_table.Q2 => "q2"
      }
\x -> "p2"
\x -> case <x : param_table.Q> of {
        param_table.Q1 => "q1";
        param_table.Q2 => "q2"
      }