Nim version 2.0 RC1

[DougT]

nim 2.0 RC1
    
    
    nim2 c -d:release  rho4.nim
    import bignum       # 0.4 latest version
    ...
    /home/doug/.nimble/pkgs/gmp-0.2.5/gmp/pure.nim(19, 48) Error: invalid 
indentation
    
    
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