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Fix later-bindings-win logic in with-fluids.

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Based on a patch by David Kastrup <dak@gnu.org>.
Fixes <http://bugs.gnu.org/13843>.

* libguile/fluids.c (scm_i_make_with_fluids): Reverse direction of inner
  loop that checks for duplicates, to properly handle more than two
  bindings to the same fluid.
This commit is contained in:
Mark H Weaver 2013-02-28 18:43:09 -05:00
parent b8d8f8b929
commit 8dd01861a9
2 changed files with 9 additions and 7 deletions
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6
libguile/fluids.c
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@ -319,10 +319,10 @@ scm_i_make_with_fluids (size_t n, SCM *fluids, SCM *vals)
/* Ensure that there are no duplicates in the fluids set -- an N^2 operation, /* Ensure that there are no duplicates in the fluids set -- an N^2 operation,
but N will usually be small, so perhaps that's OK. */ but N will usually be small, so perhaps that's OK. */
{ {
size_t i, j = n; size_t i, j;
while (j--) for (j = n; j--;)
for (i = 0; i < j; i++) for (i = j; i--;)
if (scm_is_eq (fluids[i], fluids[j])) if (scm_is_eq (fluids[i], fluids[j]))
{ {
vals[i] = vals[j]; /* later bindings win */ vals[i] = vals[j]; /* later bindings win */

10
test-suite/tests/fluids.test
View file

@ -85,15 +85,17 @@
(pass-if "last value wins" (pass-if "last value wins"
(compile '(with-fluids ((a 1) (compile '(with-fluids ((a 1)
(a 2)) (a 2)
(eqv? (fluid-ref a) 2)) (a 3))
(eqv? (fluid-ref a) 3))
#:env (current-module))) #:env (current-module)))
(pass-if "remove the duplicate, not the last binding" (pass-if "remove the duplicate, not the last binding"
(compile '(with-fluids ((a 1) (compile '(with-fluids ((a 1)
(a 2) (a 2)
(b 3)) (a 3)
(eqv? (fluid-ref b) 3)) (b 4))
(eqv? (fluid-ref b) 4))
#:env (current-module))) #:env (current-module)))
(pass-if "original value restored" (pass-if "original value restored"