Redirections and pipes involving blocks (like for-loops) buffer output #1396
Description
When I run this script in fish 2.1.0:
for i in (seq 1 5); sleep 1; echo $i; end | cat
I should except to see a slow count to 5, one line per second. Instead, I see no output, and then, five seconds later, all 5 lines appear. This appears to be the same issue as #1302.
This appears to happen regardless of the amount of output:
for i in (seq 1 5); sleep 1; cat /usr/share/dict/words; end | cat