Did a bit more experimenting, it seems to freeze only SOME of the time:

zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: 1 { say "Run 
$_"; done } }'
Run 0
^C
zoffix@VirtualBox:~$ perl6 -v
This is Rakudo version 2016.06-154-g55c359e built on MoarVM version 
2016.06-9-g8fc21d5
implementing Perl 6.c.
zoffix@VirtualBox:~$ 


But doesn't ever freeze if done is called non-first run, even if I set a tiny 
delay between intervals:

zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: .01 { say "Run 
$_"; done if $_ >= 1 } }'
Run 0
Run 1
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: .01 { say "Run 
$_"; done if $_ >= 1 } }'
Run 0
Run 1
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: .01 { say "Run 
$_"; done if $_ >= 1 } }'
Run 0
Run 1
zoffix@VirtualBox:~$ perl6 -e 'react { whenever Supply.interval: .01 { say "Run 
$_"; done if $_ >= 1 } }'
Run 0
Run 1

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