Merge "pdl: ensure we use ‘target/debug/pdl’ when running test with Cargo"

///

/// # Panics

///

/// Panics if `pdl` cannot be found on `$PATH` or if it returns a

/// non-zero exit code.

/// Panics if `pdl` cannot be found or if it fails.

fn pdl(code: &str) -> String {

    let tempdir = tempfile::tempdir().unwrap();

    let input = tempdir.path().join("input.pdl");

    fs::write(&input, code.as_bytes()).unwrap();

    let pdl_path = find_binary("pdl").unwrap();

    // Cargo will set `CARGO_BIN_EXE_pdl` when compiling the crate. If

    // we're not using Cargo, we search for `pdl` using find_binary.

    let pdl_path = match std::option_env!("CARGO_BIN_EXE_pdl") {

        Some(pdl_path) => std::path::PathBuf::from(pdl_path),

        None => find_binary("pdl").unwrap(),

    };

    let output = Command::new(&pdl_path)

        .arg("--output-format")

        .arg("rust")