Rust 期望一个具有固定大小 x 元素的数组，找到一个具有 y 元素的数组

我正在try 基于正在为其编译应用程序的设备来更改应用程序的图标(我正在使用image crate加载).不幸的是，在try 运行代码时:

    let (icon_rgba, icon_width, icon_height) = {
        let icon = if cfg!(target_os = "macos") {
            include_bytes!("../assets/icon-macos.png")
        } else {
            include_bytes!("../assets/icon.png")
        };
        let image = image::load_from_memory(icon)
            .expect("Failed to open icon path")
            .into_rgba8();
        let (width, height) = image.dimensions();
        let rgba = image.into_raw();
        (rgba, width, height)
    };

我得到以下错误:

error[E0308]: `if` and `else` have incompatible types
 --> src/main.rs:6:13
  |
3 |           let icon = if cfg!(target_os = "macos") {
  |  ____________________-
4 | |             include_bytes!("../assets/icon-macos.png")
  | |             ------------------------------- expected because of this
5 | |         } else {
6 | |             include_bytes!("../assets/icon.png")
  | |             ^^^^^^^^^^^^^^^^^^^^^^^^^ expected an array with a fixed size of 63249 elements, found one with 471 elements
7 | |         };
  | |_________- `if` and `else` have incompatible types
  |
  = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

虽然我知道为什么会发生这个错误，但是有没有比下面列出的代码更好的方法来解决这个问题呢？

    let (icon_rgba, icon_width, icon_height) = {
        if cfg!(target_os = "macos") {
            let icon = include_bytes!("../assets/icon-macos.png");
            let image = image::load_from_memory(icon)
                .expect("Failed to open icon path")
                .into_rgba8();
            let (width, height) = image.dimensions();
            let rgba = image.into_raw();
            (rgba, width, height)
        } else {
            let icon = include_bytes!("../assets/icon.png");
            let image = image::load_from_memory(icon)
                .expect("Failed to open icon path")
                .into_rgba8();
            let (width, height) = image.dimensions();
            let rgba = image.into_raw();
            (rgba, width, height)
        };
    };