Test init reservation failure

tests/err_init_reservation_fatal.c

@@ -0,0 +1,20 @@
+#include "akerror.h"
+
+#include <stdio.h>
+
+/*
+ * This executable links to akerror_init_failure, a test-only library target
+ * with no status-range slots. The first reservation in akerr_init() must be
+ * terminal: continuing would leave every library status unowned and make all
+ * subsequent name registrations invalid.
+ *
+ * CTest marks this WILL_FAIL. Reaching the message and returning zero means
+ * initialization swallowed its own reservation failure.
+ */
+int main(void)
+{
+    akerr_init();
+
+    fprintf(stderr, "err_init_reservation_fatal: akerr_init did not terminate\n");
+    return 0;
+}