Can some other instructions just follow the IRET?

Hi all,
According to what I've learned,the IRET will make the control leave the
interrupt service program and return where is interrupted,so I think
any other instruction just following the IRET will not be executed.But
today in a sample of interrupt service program I saw the author write a
JMP instruction just following the IRET.Will the JMP be executed under
any situation?
Any help will be appreciated! Thanks a lot!

.

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