os.sleep is not working properly

[hamidb80]

info:

• nim compiler version: 1.4.8
• inim version : 0.6.1
• os: windows 10

the code:

import os

nim> proc uuu=   
     echo "start"
     sleep 1000
     echo "end"

nim> uuu()

result:
it prints "end" immediately after printing "start"

expected behavior:
it should sleep for 1s and then print "end"

[0atman]

Confirmed.

I wonder if it is something to do with the whole line being executed and only then the output is printed?