Auto merge of #13336 - nyurik:ref-option-sig, r=llogiq #4541

Job	Run time
changelog	4s
metadata_collection	1m 47s
integration_build	1m 14s
base (ubuntu-latest, x86_64-unknown-linux-gnu)	4m 21s
base (ubuntu-latest, i686-unknown-linux-gnu)	5m 29s
base (windows-latest, x86_64-pc-windows-msvc)	5m 36s
base (macos-13, x86_64-apple-darwin)	5m 27s
integration (matthiaskrgr/clippy_ci_panic_test)	23s
integration (rust-lang/cargo)	3m 8s
integration (rust-lang/chalk)	1m 55s
integration (rust-lang/rustfmt)	53s
integration (Marwes/combine)	55s
integration (Geal/nom)	47s
integration (rust-lang/stdarch)	35s
integration (serde-rs/serde)	58s
integration (chronotope/chrono)	38s
integration (hyperium/hyper)	39s
integration (rust-random/rand)	37s
integration (rust-lang/futures-rs)	50s
integration (rust-itertools/itertools)	38s
integration (rust-lang-nursery/failure)	26s
integration (rust-lang/log)	33s
bors test finished	1s
bors test finished	0s
	37m 54s

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