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Succeed or Fail
(define (seval sexp succeed fail env)
(cond ((primitive? sexp) sexp)
((symbol? sexp) (succeed (lookup-environment env sexp) fail))
; Special forms
((define? sexp) (seval-define sexp env))
((if? sexp) (succeed (seval-if sexp env) fail)
((lambda? sexp) (succeed (seval-lambda sexp env) fail))
; Procedure application
((list? sexp) (sapply sexp env))
(else (error "Bad expression")))))
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