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-
(let ((v
e) (v
e))
. body) 
(progn . body)
where body is evaluated in the context of the
local variables 
, created in parallel, i.e. first
all 
are evaluated, then the 
are (single-)
assigned (bound)
-
(let* ((v e) (v e))
. body)
(progn . body)
where body is evaluated in the context of the
local variables 
, created sequentially
-
(psetq var expr var expr)
nil
with the parallel (re-)assignment of var
to
expr
, 
, via side effect
-
(setq var expr var expr)
with the sequential (re-)assignment of var to
expr, , via side effect