Fix handling of lifetimes not used in fn param types #713

Job	Run time
version-sync	7s
compilation-benchmarks	2m 13s
cargo-fmt	20s
cargo-doc (ubuntu)	19s
cargo-lock	6s
cargo-doc (windows)	2m 39s
cargo-machete	3s
cargo-doc (macos)	39s
cargo-miri	1m 51s
runtime-benchmarks (args_3)	49s
test-msrv (ubuntu)	33s
runtime-benchmarks (args_5)	1m 0s
test-unstable (beta)	25s
test-msrv (windows)	1m 45s
test-stable (ubuntu)	1m 15s
runtime-benchmarks (args_10_alloc)	57s
test-unstable (nightly)	27s
test-stable (windows)	2m 42s
test-msrv (macos)	35s
runtime-benchmarks (args_10_structs)	53s
test-stable (macos)	1m 10s
runtime-benchmarks (args_10)	1m 0s
runtime-benchmarks (args_20)	1m 7s
prettier	7s
taplo-fmt	4s
typos	5s
website-build	20s
	23m 31s

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