Is it possible to use prototypes (or something else) so that I can write something like this: 
  in_directory "/tmp", {
    system("...");
    ...
  };

[download]
and have the curly braces interpreted as an anonymous sub?

It would nice not to have to write "sub" in front of the opening curly brace.

I know that I can use the (&$) prototype and put my directory parameter after the block, e.g.: 

  in_directory { system(...); ... } "/tmp";

[download]
I'm just wondering if there is any possible way of having it the other way around.

In reply to block as second function argument? by perl5ever

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