No ampersand, but the way chromatic wrote it: 

$self->$argument( ... )

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Recently there was an interesting discussion on the use of AUTOLOAD for accessor generation; it starts here. In particular, tilly's first reply illustrates the approach that chromatic alluded to.

the lowliest monk

In reply to Re^3: Calling arbitrary method from new by tlm
in thread Calling arbitrary method from new by mrborisguy

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