Mindset Nim

[Vindaar]

When people talk about a Nim REPL they usually mean a REPL for the C/C++ 
backend. The Nim VM can only evaluate pure Nim code, so anything that ends up 
calling some wrapped C code / shared library doesn't work. In practice that 
means the Nim VM cannot be used for anything non trivial. (There's also a 
performance aspect to this, but that's secondary)