Carp::clan is a perl module designed to report errors from the perspective of the caller of a "clan" of modules, similar to "carp" itself. instead of giving it a number of levels to skip on the calling stack, you give it a pattern to characterize the package names of the "clan" of modules which shall never be blamed for any error.

these modules stick together like a "clan" and any error which occurs will be blamed on the "outsider" script or modules not belonging to this clan.