From type/IO/Path

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method rename(IO::Path:D: IO() $to, :$createonly = False --> Bool:D)
sub    rename(IO() $from, IO() $to, :$createonly = False --> Bool:D)

Renames a file or directory. Returns True on success; fail with X::IO::Rename if :$createonly is True and the $to path already exists or if the operation failed for some other reason.

Note: some renames will always fail, such as when the new name is on a different storage device. See also: move.