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-rw-r--r--modules/mod-test/mod-test.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/modules/mod-test/mod-test.c b/modules/mod-test/mod-test.c
index 44a14dc6fdd..b0c535cdd72 100644
--- a/modules/mod-test/mod-test.c
+++ b/modules/mod-test/mod-test.c
@@ -42,6 +42,8 @@ sum (intmax_t a, intmax_t b)
static emacs_value
Fmod_test_sum (emacs_env *env, ptrdiff_t nargs, emacs_value args[], void *data)
{
+ assert (nargs == 2);
+
intmax_t a = env->extract_integer (env, args[0]);
intmax_t b = env->extract_integer (env, args[1]);