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mechaml
Option.Syntax
val (let*) : 'a option -> ('a -> 'b option) -> 'b option
val (and*) : 'a option -> 'b option -> ('a * 'b) option
val (let+) : 'a option -> ('a -> 'b) -> 'b option
val (and+) : 'a option -> 'b option -> ('a * 'b) option