Nim's author was originally a Turbo Pascal/Delphi programmer. A lot of Nim and its conventions (things like prefixing type names with T and members with F) come directly from Borland's Pascal dialect.

Pretty much. Here is an example:

    type
      EGlassRNState = enum
        EGlassRNState_Initial,
        EGlassRNState_Weakened,
        EGlassRNState_Shattering,
        EGlassRNState_Shattered,
        EGlassRNState_ActiveFrags

    proc hasGlassShattered(mState: set[EGlassRNState]): bool =
      EGlassRNState_Shattered in mState

    proc hasActiveFragments(mState: set[EGlassRNState]): bool =
      EGlassRNState_ActiveFrags in mState

    assert hasActiveFragments({EGlassRNState_Shattered, EGlassRNState_ActiveFrags})