der

der: add const ::new to Length, BytesRef, AnyRef (#1713) #3397

Job	Run time
build (stable, thumbv7em-none-eabi)	1m 15s
derive (1.85.0)	25s
build (1.85.0, thumbv7em-none-eabi)	1m 20s
derive (stable)	16s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	9m 28s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	9m 23s
build (stable, wasm32-unknown-unknown)	1m 7s
build (1.85.0, wasm32-unknown-unknown)	1m 17s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	9m 15s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	9m 26s
minimal-versions	0s
	43m 12s

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