f_ = proc_self(lambda(v0)); t_ = proc(lambda(v1), f()); id_ = proc(v0, f()); pair_ = lambda3(op_if(v0, v1, v2));
[1] https://github.com/wedesoft/blc/blob/master/src/x.c#651
[1] https://github.com/wedesoft/blc/blob/master/src/x.c#651
For the moment I gave up on it though but maybe it might serve as inspiration ;)