AliasKind = enum
  yes, no, maybe

PathKinds0 = {nkDotExpr, nkCheckedFieldExpr, nkBracketExpr, nkDerefExpr,
              nkHiddenDeref, nkAddr, nkHiddenAddr, nkObjDownConv, nkObjUpConv}

PathKinds1 = {nkHiddenStdConv, nkHiddenSubConv}