Fix kw rrule closure argument index

[wsmoses]

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[github-actions]

Benchmark Results

	main	acefc42...	main/acefc428e2705a...
basics/overhead	4.03 ± 0.01 ns	4.34 ± 0.01 ns	0.928
time_to_load	0.4 ± 0.0016 s	0.402 ± 0.0045 s	0.995

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).