Arguably it should be disallowed

Why? LIST here is the standard argument passing mechanism. Making an exception for a my expression in an argument list or making an exception for expressions in import lists would be complicated and break symmetry of syntax, semantics, and implementation.

This is the piece that sundial's missing. It's a confusing combination of existing Perl behavior because it's uncommon and relatively useless, but it's valid syntax because of the way Perl works.

In reply to Re^5: use has it's own scope? by chromatic
in thread use has it's own scope? by LanX

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