[Rust] Take slices by reference. (#979) #29

Job	Run time
C++ Clang 9 (Ubuntu 20.04)	1m 17s
C++ Clang 10 (Ubuntu 20.04)	1m 28s
C++ Clang 13 (Ubuntu 22.04)	1m 24s
C++ Xcode (macOS)	1m 36s
C++ Clang 11 (Ubuntu 20.04)	1m 27s
C++ Clang 14 (Ubuntu 22.04)	1m 31s
C++ Clang 12 (Ubuntu 20.04)	1m 35s
C++ Clang 15 (Ubuntu 22.04)	1m 14s
C++ Clang 16 (Ubuntu 22.04)	1m 19s
C++ GCC 6 (Ubuntu 20.04)	1m 35s
C++ Clang 17 (Ubuntu 22.04)	1m 19s
C++ GCC 11 (Ubuntu 22.04)	1m 24s
C++ MSVC (Windows) (windows-latest)	38s
C++ GCC 7 (Ubuntu 20.04)	1m 25s
C++ GCC 12 (Ubuntu 22.04)	1m 44s
C++ GCC 8 (Ubuntu 20.04)	1m 29s
C# 8.0.x	46s
Java 8 (ubuntu-22.04)	41s
C++ GCC 13 (Ubuntu 22.04)	50s
C++ GCC 9 (Ubuntu 20.04)	1m 23s
Java 8 (windows-latest)	24s
C++ GCC 10 (Ubuntu 20.04)	1m 22s
Rust stable	35s
Java 17 (ubuntu-22.04)	47s
Rust beta	39s
Java 17 (windows-latest)	26s
Rust nightly	35s
Java 21 (ubuntu-22.04)	41s
Java 21 (windows-latest)	27s
	32m 1s

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