You can search for identifiers within the package.
in-package search v0.2.0
type dbh
type stmt
type stmt_result
type error
val create : dbh -> string -> (stmt, error) result IO.t
val close : stmt -> (unit, error) result IO.t
val execute_null : stmt -> string option array -> (stmt_result, error) result IO.t
val fetch : stmt_result -> (string option array option, error) result IO.t