Syntax rules for Haskell infix datatype constructors

Question

I\'m trying to make a Haskell datatype a bit like a python dictionary, a ruby hash or a javascript object, in which a string is linked to a value, like so:

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Answer 1

Any operator that starts with a colon : is a type constructor or a data constructor, with the exception of (->). If you want the tilde, you could use :~>, but you're not going to get away with using something that doesn't start with a colon. Source