\&execute and \execute do two different things.    \&execute passes a code reference to the subroutine threads->create while \execute executes the subroutine execute and passes a reference to the return value.

In reply to Re: effects of ampersand and non ampersand when referencing a sub name by jwkrahn
in thread effects of ampersand and non ampersand when referencing a sub name by ISAI student

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