rust-embed 8.12.0

Rust Custom Derive Macro which loads files into the rust binary at compile time during release and loads the file from the fs during dev
Documentation 
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use rust_embed::Embed;

/// Test doc comment
#[derive(Embed)]
#[folder = "$CARGO_MANIFEST_DIR/examples/public/"]
struct Asset;

static CHECK_UNDEFINED: Option<&str> = option_env!("__UNDEFINED__");

#[derive(Embed)]
#[folder = "$__UNDEFINED__/examples/public/"]
#[allow_missing = true]
struct UndefinedAsset;

#[test]
fn undefined_usable() {
  assert!(CHECK_UNDEFINED.is_none(), "__UNDEFINED__ should not be defined at compile time");
  assert!(UndefinedAsset::get("index.html").is_none(), "index.html should not exist");

  let mut num_files = 0;
  for file in UndefinedAsset::iter() {
    assert!(UndefinedAsset::get(file.as_ref()).is_some());
    num_files += 1;
  }
  assert_eq!(num_files, 0);
}

#[test]
fn get_works() {
  assert!(Asset::get("index.html").is_some(), "index.html should exist");
  assert!(Asset::get("gg.html").is_none(), "gg.html should not exist");
  assert!(Asset::get("images/llama.png").is_some(), "llama.png should exist");
}

#[test]
fn iter_works() {
  let mut num_files = 0;
  for file in Asset::iter() {
    assert!(Asset::get(file.as_ref()).is_some());
    num_files += 1;
  }
  assert_eq!(num_files, 7);
}

#[test]
fn trait_works_generic() {
  trait_works_generic_helper::<Asset>();
}
fn trait_works_generic_helper<E: rust_embed::Embed>() {
  let mut num_files = 0;
  for file in E::iter() {
    assert!(E::get(file.as_ref()).is_some());
    num_files += 1;
  }
  assert_eq!(num_files, 7);
  assert!(E::get("gg.html").is_none(), "gg.html should not exist");
}