Adds an array reference type #410

Job	Run time
clippy/stable	15s
Pass MSRV values to other jobs	2s
format/nightly	15s
nostd/thumbv6m-none-eabi/stable	21s
cross_test/i686-unknown-linux-gnu/stable	1m 27s
cargo-careful	2m 19s
miri	8m 14s
docs/nightly	21s
cross_test/s390x-unknown-linux-gnu/stable	6m 5s
blas-msrv	35s
tests/nightly	3m 10s
tests/1.64.0	3m 35s
tests/stable	2m 45s
tests/beta	2m 41s
conclusion	3s
	32m 8s

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