Establishing New Variable Bindings

CLtL2 Reference 

macro CLET : (bindings &body body)

The SubL construct CLET can be used to introduce new local variables or bind special variables. The variables are initialized in order just like LET* in Common Lisp. Since it is procedural, it does not return a value.

SubL has no counterpart to Common Lisp's LET construct. 

macro CPROGV : (special-vars bindings &body body)

CPROGV is procedural and therefore does not return a value. Otherwise, it is equivalent to progv in Common Lisp.