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| author | Chris Marusich <cmmarusich@gmail.com> | 2017-04-06 02:28:35 -0700 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2017-04-08 14:40:51 +0200 |
| commit | 60a9fcb1377e4acc78a930904ef80b69a1c63f25 (patch) | |
| tree | d82276055478fe01a529080443273e5214ace344 /guix/monads.scm | |
| parent | d922c8e4b773407ca525360e8c564484db34db07 (diff) | |
monads, doc: Improve mwhen and munless documentation.
* doc/guix.texi (The Store Monad) <mwhen, munless>: Document them.
* guix/monads.scm (mwhen, munless): Clarify their intended use.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
Diffstat (limited to 'guix/monads.scm')
| -rw-r--r-- | guix/monads.scm | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/guix/monads.scm b/guix/monads.scm index 6933f7f151..fe3d5d78f1 100644 --- a/guix/monads.scm +++ b/guix/monads.scm @@ -204,8 +204,10 @@ the last one." (define-syntax mwhen (syntax-rules () - "When CONDITION is true, evaluate MEXP0..MEXP* as in an 'mbegin'. When -CONDITION is false, return *unspecified* in the current monad." + "When CONDITION is true, evaluate the sequence of monadic expressions +MEXP0..MEXP* as in an 'mbegin'. When CONDITION is false, return *unspecified* +in the current monad. Every expression in the sequence must be a monadic +expression." ((_ condition mexp0 mexp* ...) (if condition (mbegin %current-monad @@ -214,8 +216,10 @@ CONDITION is false, return *unspecified* in the current monad." (define-syntax munless (syntax-rules () - "When CONDITION is false, evaluate MEXP0..MEXP* as in an 'mbegin'. When -CONDITION is true, return *unspecified* in the current monad." + "When CONDITION is false, evaluate the sequence of monadic expressions +MEXP0..MEXP* as in an 'mbegin'. When CONDITION is true, return *unspecified* +in the current monad. Every expression in the sequence must be a monadic +expression." ((_ condition mexp0 mexp* ...) (if condition (return *unspecified*) |