If your set of symbol is closed, you can use a variant type (sum type). type symbols = | A | B
If you really need open symbols, you can use [polymorphic variants]. Let tag_a foo = (`A, foo) [polymorphic variants] http://caml.inria.fr/pub/docs/manual-ocaml/manual006.html#toc36 However, you won't have convenience functions such as string_of_symbol; you would have to define them yourself.
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