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monads: Add 'lift0'.

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* guix/monads.scm (lift0): New variable.
This commit is contained in:
Ludovic Courtès 2014-12-02 10:10:51 +01:00
parent 21caa6deeb
commit b307c06456
1 changed files with 2 additions and 1 deletions
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3
guix/monads.scm
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@ -41,7 +41,7 @@
mbegin
mwhen
munless
lift1 lift2 lift3 lift4 lift5 lift6 lift7 lift
lift0 lift1 lift2 lift3 lift4 lift5 lift6 lift7 lift
listm
foldm
mapm
@ -222,6 +222,7 @@ CONDITION is true, return *unspecified* in the current monad."
(with-monad monad
(return (proc args ...))))))))
(define-lift lift0 ())
(define-lift lift1 (a))
(define-lift lift2 (a b))
(define-lift lift3 (a b c))