asynchronous - How can I read from the standard error of another program, line by line? -

this program catches of standard error program, gives me partial line:

#!/bin/env perl6  $proc = proc::async.new('./print_to_stderr');  $proc.stderr.tap( -> $str {     $str.lines() {         put "captured err: $_";     } });  $promise = $proc.start;  await $promise; 

using ./print_to_stderr:

#!/bin/env perl6  ^10 {     $*err.put: "($_): howdee"; } 

just now, got following output:

captured err: (0): howdee captured err: (1): howdee ... captured err: (6): howdee captured err: (7): howde captured err: e captured err: (8): howdee 

as see, item 7, standard error broken between 2 different taps. i'd wait , give me whole line.

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update: reproducible me using rakudo star 2017.04, isn't issue in rakudo star 2017.07 pointed out elizabeth mattijsen below.

which version of rakudo perl 6 using? cannot reproduce issue. in case, supply.lines should not give incomplete lines, ever. if happening on recent version of rakudo perl 6, should reported bug.