[Compiler.saveMono] size: 7
    def foo b a.1 : EStateM.Result IO.Error PUnit PUnit :=
      cases b : EStateM.Result IO.Error PUnit PUnit
      | Bool.false =>
        let _x.2 := 1;
        let _x.3 := print _x.2 a.1;
        return _x.3
      | Bool.true =>
        let _x.4 := 0;
        let _x.5 := print _x.4 a.1;
        return _x.5