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-rw-r--r--ext/psych/yaml/yaml_private.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/ext/psych/yaml/yaml_private.h b/ext/psych/yaml/yaml_private.h
index 21fc5e4326..cd3d3a56c4 100644
--- a/ext/psych/yaml/yaml_private.h
+++ b/ext/psych/yaml/yaml_private.h
@@ -433,7 +433,8 @@ yaml_queue_extend(void **start, void **head, void **tail, void **end);
(stack).start = (stack).top = (stack).end = 0)
#define STACK_EMPTY(context,stack) \
- ((stack).start == (stack).top)
+ ((void)(context), \
+ ((stack).start == (stack).top))
#define STACK_LIMIT(context,stack,size) \
((stack).top - (stack).start < (size) ? \