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| author | Ludovic Courtès <ludo@gnu.org> | 2017-09-03 23:29:11 +0200 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2017-09-03 23:36:17 +0200 |
| commit | e3c83a7cd3618a87d74e58973dcd82e560e2da97 (patch) | |
| tree | c0e3aaa4db8c59eba64f045478ed08be8cfa17ab | |
| parent | 43637673944226412a27967c235046546d7771ed (diff) | |
| download | patches-e3c83a7cd3618a87d74e58973dcd82e560e2da97.tar patches-e3c83a7cd3618a87d74e58973dcd82e560e2da97.tar.gz | |
memoization: (mlambda () ...) allows for inner 'define'.
Previously (mlambda () (define foo 2) bar) would trigger a syntax error.
* guix/memoization.scm (%mlambda): In the zero-argument case, move
BODY... to a lambda to allow for inner 'define' and such.
| -rw-r--r-- | guix/memoization.scm | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/guix/memoization.scm b/guix/memoization.scm index 5cae283610..bf3b73d806 100644 --- a/guix/memoization.scm +++ b/guix/memoization.scm @@ -76,10 +76,11 @@ the result is returned via (apply values results)." exactly one value." ((_ cached () body ...) ;; The zero-argument case is equivalent to a promise. - (let ((result #f) (cached? #f)) + (let ((result #f) (cached? #f) + (compute (lambda () body ...))) (lambda () (unless cached? - (set! result (begin body ...)) + (set! result (compute)) (set! cached? #t)) result))) |