Part of the output of `cargo build --message-format=json` for a project with `src/bin/server.rs`

output.json

{
  "features":[],
  "filenames":["/Users/carolnichols/rust/crates.io/target/debug/server"],
  "fresh":false,
  "package_id":"cargo-registry 0.2.1 (path+file:///Users/carolnichols/rust/crates.io)",
  "profile":{"debug_assertions":true,"debuginfo":2,"opt_level":"0","overflow_checks":true,"test":false},
  "reason":"compiler-artifact",
  "target":{
    "crate_types":["bin"],
    "kind":["bin"],
    "name":"server","src_path":"/Users/carolnichols/rust/crates.io/src/bin/server.rs"
  }
}