PROGN$.html -- ACL2 Version 6.3

### PROGN$

execute a sequence of forms and return the value of the last one

    Major Section:  ACL2-BUILT-INS

This macro expands to a corresponding nest of calls of `prog2$`; see prog2$. The examples below show how this works: the first case below is typical, but we conclude with two special cases.

    ACL2 !>:trans1 (progn$ (f1 x) (f2 x) (f3 x))
     (PROG2$ (F1 X) (PROG2$ (F2 X) (F3 X)))
    ACL2 !>:trans1 (progn$ (f1 x) (f2 x))
     (PROG2$ (F1 X) (F2 X))
    ACL2 !>:trans1 (progn$ (f1 x))
     (F1 X)
    ACL2 !>:trans1 (progn$)
     NIL
    ACL2 !>