$input->bind('<Return>', [\&mysub, $arg]);

[download]
... UPDATE
My solution is NOT correct for calling subs with bind...

On the contrary, your solution, forming an anonymous array containing a subroutine ref followed by args to be passed to the sub, is entirely correct. It's the idiom that I normally use for bind calls of this sort.

In reply to Re: Re: Binding Tk events by graff
in thread Binding Tk events by Scarborough

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