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type varname = string
val extract_string_variable_or :
?k:(string -> string) -> (** An optional continuation *)
?unsuitable_value:(string -> bool) -> (** Filter unsuitable values *)
default:string -> (** The default value, if the variable is undeclared or its value unsuitable *)
varname -> string (** The name of the variable *)
val extract_bool_variable_or :
default:bool -> (** The default value, if the variable is undeclared or its value unsuitable *)
varname -> bool (** The name of the variable *)
val get_string_variable :
?k:(string -> string option) -> (** An optional continuation, applied with Option.bind *)
?unsuitable_value:(string -> bool) -> (** Filter unsuitable values *)
varname -> string option (** The name of the variable *)
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