Avoid index clone in next #636

Job	Run time
format/nightly	12s
nostd/thumbv6m-none-eabi/stable	20s
clippy/stable	25s
cross_test/i686-unknown-linux-gnu/stable	1m 54s
docs/nightly	24s
cargo-careful	2m 13s
cross_test/s390x-unknown-linux-gnu/stable	8m 21s
miri	41s
Pass MSRV values to other jobs	2s
tests/stable	2m 30s
blas-msrv	42s
tests/nightly	3m 9s
tests/1.64.0	3m 26s
tests/beta	2m 31s
conclusion	0s
	26m 50s

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