  The HypHI Collaboration at GSI argued recently for a (Lambda-n-n) bound state
from the observation of its two-body (t + pi-) weak-decay mode. We derive
constraints from several hypernuclear systems, in particular from the A=4
hypernuclei with full consideration of (Lambda N <--> Sigma N) coupling, to
rule out a bound (Lambda-n-n).
