Enums with holes are iterable

[def-]

The manual states here http://nim-lang.org/manual.html#enumeration-types :

type
  TokenType = enum
    a = 2, b = 4, c = 89 # holes are valid

However, it is then not an ordinal anymore, so it is not possible to use these enums as an index type for arrays. The procedures inc, dec, succ and pred are not available for them either.

But I can iterate over this:

for i in TokenType.low .. TokenType.high:
  echo i

Either the documentation should be updated or the implementation fixed.

I think it should be possible in one way or another, but the current implementation is very slow since it iterates through every integer between low and high.

[flaviut]

related #1239

[def-]

Ok, it's a duplicate.

[timotheecour]

now possible via add enumutils.items for sparse enums, typetraits.SomeSparseEnum by timotheecour · Pull Request #17080 · nim-lang/Nim