Fix Clippy lints #1871

Job	Run time
nightly	3m 11s
clippy	2m 39s
docs	3m 17s
msrv	1m 42s
rustfmt	7s
basics	1s
test_doc	6m 52s
test_lib	5m 10s
no_std (ubuntu-latest, minimal)	1m 19s
build_feature (alloc)	3m 31s
no_std (macos-latest, minimal)	1m 46s
build_feature (cli)	4m 19s
test_rune	3m 50s
test_miri (rune)	3m 45s
build_feature (cli,doc)	4m 11s
wasm	1m 17s
test_miri (rune-core)	57s
build_feature (cli,fmt)	4m 2s
test_miri (rune-alloc)	6m 26s
build_feature (doc)	3m 31s
build_feature (workspace)	3m 27s
build_feature (languageserver)	4m 0s
build_feature (byte-code)	3m 28s
build_feature (capture-io)	3m 31s
build_feature (emit)	3m 37s
	1h 19m 56s

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