perldiag's according entry looks as following: 

  • Can't modify non-lvalue subroutine call

(F) Subroutines meant to be used in lvalue context should be declared as such,
    see "Lvalue subroutines" in perlsub.

    • In reply to Re: Help with OLE module and MSI files by shigetsu
    in thread Help with OLE module and MSI files by Anonymous Monk

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