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peval: Clarify `pure-expression?'.

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* module/language/tree-il/optimize.scm (peval)[pure-expression?]:
  Clarify the comment.
This commit is contained in:
Ludovic Courtès 2011-09-13 23:30:22 +02:00
parent 735249513a
commit af1c6e424f
1 changed files with 3 additions and 2 deletions
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5
module/language/tree-il/optimize.scm
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@ -99,8 +99,9 @@ it should be called before `fix-letrec'."
(define (pure-expression? x)
;; Return true if X is pure---i.e., if it is known to have no
;; effects and does not allocate new storage. Note: <module-ref> is
;; not "pure" because it loads a module as a side-effect.
;; effects and does not allocate storage for a mutable object.
;; Note: <module-ref> is not "pure" because it loads a module as a
;; side-effect.
(let loop ((x x))
(match x
(($ <void>) #t)