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Rakudo::Version zef:lizmat last updated on 2023-02-24


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Rakudo::Version - provide a "rakudo version" pragma


# Exactly this version
use rakudo v2022.01;

# From this version onward
use rakudo v2023.02+;

# More elaborate checks with a Callable
use rakudo { $_ ~~ v2022.01 || $_ ~~ v2022.07+ }

# Custom error message
use rakudo {
    $_ ~~ v2022.07+ || die "$_ is not recent enough for this"


The Rakudo::Version distribution provides a use rakudo pragma that allows one to specify with which version of Rakudo a program is supposed to run.

Version checking occurs either by specifying a Version value (which will be smart-matched with the current compiler Version), or it can be a Callable which will be given the current Version value, and which should return a Bool indicating whether or not the Rakudo release is acceptable.


The RakudoPrereq module, originally by Zoffix Znet, provides a more general approach to the problem of limiting a program to a specific release.


Elizabeth Mattijsen [email protected]

Source can be located at: . Comments and Pull Requests are welcome.

If you like this module, or what I’m doing more generally, committing to a small sponsorship would mean a great deal to me!


Copyright 2023 Elizabeth Mattijsen

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.