Yes, right, this syntax allows only the block syntax, not the expression syntax. And I don't think there is any simple way to enable an expression syntax for such a sort subroutine (or for a custom clone of the map or grep functions).

But that does not deprive you of any functionality: any sort construct using the sort expression syntax can be easily transformed into a block syntax, essentially by adding a pair of curly brackets and removing the comma.

In reply to Re^3: Prototype like sort()? by Laurent_R
in thread Prototype like sort()? by perlancar

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