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Is there a BNF type grammer description of the Purescript language?

It is hard to get a good handle on the language when the syntax is buried and scattered into various documentation of concepts and intent and so forth.

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PureScript doesn't have an official spec yet. It hasn't yet reached 1.0 - Fyodor Soikin
@FyodorSoikin Isn't there a working ABNF that directs its development or is part of its parsing? - George

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The closest thing to that would be the Parser.y file, in the purescript-cst sub-project.