On Thu Jul 21 14:42:42 2016, moritz wrote: > Consider this code: > > #!/usr/bin/env perl6 > > my $source = Supply.interval(1); > $source.tap({ say 'DEBUG: source'}); > my $heartbeat = Supply.interval(0.7); > $heartbeat.tap({ say 'DEBUG: heartbeat'}); > react { > whenever $source.zip-latest($heartbeat) { > say 'WHENEVER'; > } > } > > # Output: > # DEBUG: source > # DEBUG: heartbeat > # DEBUG: heartbeat > # DEBUG: source > # DEBUG: heartbeat > # > # ... and then it hangs, and produces no output anymore. > > The mere fact that I combine those two supplies with zip-latest stops > the original supplies from producing values (or at least from calling > the .tap), and the whenever block isn't executed either. > > So either I totally misunderstood zip-latest, or it's totally b0rked. Or > both :-) > It should have worked. Since this RT was filed, multiple fixes have been made to supplies, and it seems one of them nailed this bug. I committed a test in S17-supply/zip-latest.t (and checked that it hung back in the June release, so it seems it covers it decently well).