Common Lisp

What is the rationale for progn, progv, block, let, flet, let* and return-from being special forms? They all could be simulated with TAGBODY and a few SETQs. C/C++ goes well with just {} being tagbody.

Common Lisp is stupid.

>>4
You can implement tagbody using continuations, which themselves could be represented by just lambda. A good enough compiler could optimize continuations back to gotos.

the only other fundamental form, besides lambda, is set!

you can implement set! with just lambda.