Shortcut to print values of discarded symbols: fails on OSX, works on ubuntu
ubuntu:
```
inim
INim 0.2.5
Nim Compiler Version 0.18.0 [Linux: amd64] at /home/ubuntu/.linuxbrew/bin/nim
>>> 1+1
2 : int literal(2)
```
OSX:
```
inim
INim 0.2.5
Nim Compiler Version 0.18.1 [MacOSX: amd64] at /Users/timothee/.nimble/bin/nim
>>> 1+1
Error: expression '2' is of type 'int literal(2)' and has to be discarded
  1+1
   ^
>>>
```