Note the error is basically something you'd encounter here as well:
    
    
    proc x(): int =
      echo "Something"
      return 5
    
    x()
    
    
    Run

This will not compile because nim will throw the same error as you got. The 
reasoning is:

If you call a proc that returns an output, the **vast majority** 99% of the 
time you actually want the value of that output. Ignoring that output is 
_typically_ a user-error. For the cases where it isn't, you have `discard` so 
you can explicitly say "I only want to execute this proc, I don't care for the 
output".

So to make the example above work, you'd need to explicitly discard the return 
from x():
    
    
    proc x(): int =
      echo "Something"
      return 5
    
    discard x()
    
    
    Run

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