Add two-step modification test file. #773

Job	Run time
Rust check	20s
Rust format	18s
Rust test	1m 37s
Rust doc	1m 39s
Rust check with default features	22s
Rust check (windows-latest)	46s
Rust check (macos-latest)	37s
Rust lint	22s
Rust lint (stable)	17s
Rust lint (beta)	25s
Rust lint (nightly)	47s
	7m 30s

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