Smartmatch is experimental at t/1.t line 20.
t/1.t .. 
ok 1
ok 2
ok 3
ok 4
ok 5
[2021-12-16 12:59:25] nameserver accessible locally @ 127.0.0.1
ok 6
1..6
ok
All tests successful.
Files=1, Tests=6,  0 wallclock secs ( 0.01 usr  0.01 sys +  0.11 cusr  0.03 csys =  0.16 CPU)
Result: PASS