R/methods-VersionsNull.R
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 ## Unversioned
 ##
 
 setMethod("initialize", signature(.Object="VersionsNull"),
           function(.Object, ...) {
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               if (!missing(...))
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                 warning("ignoring arguments to '.VersionsNull()')")
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               .Object
           })
 
 setMethod("show", signature(object="VersionsNull"),
           function(object) print("No version"))