FYC [https://github.com/nim-lang/Nim/blob/version-1-2/lib/system.nim#L2485](https://github.com/nim-lang/Nim/blob/version-1-2/lib/system.nim#L2485)
- No `[]` iterators for collections? dawkot
- Re: No `[]` iterators for collections? juancarlospaco
- Re: No `[]` iterators for collections? jackhftang
