trpl-zh-cn/listings/ch12-an-io-project/output-only-03-multiple-matches/output.txt

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$ cargo run -- body poem.txt
Compiling minigrep v0.1.0 (file:///projects/minigrep)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.0s
Running `target/debug/minigrep body poem.txt`
I'm nobody! Who are you?
Are you nobody, too?
How dreary to be somebody!