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-<h1 align="center">Implementing Fallbacks</h1>
-<p align="center">
-    Handling error cases in your program using a fallback mechanism
-</p>
-
-## Recap
-
-   In the last post, we introduced how to develop a basic CLI program using **Mingling**: you can use the `"greet"` subcommand to output `"Hello, World!"`, or use `"greet Alice"` to output `"Hello, Alice!"`
-
-   But what happens when the user does not enter `"greet"`? Let's type a command and find out ⌨️
-
-```bash
-~> your-bin hello
-~> your-bin hello Alice
-```
- 
-   **It does nothing!** 👆
-
-   Let me explain why: **Mingling** doesn't presume to act; it will not output anything to the terminal no matter what happens (except for `panic!` under `unwind`)
-
-   This means that if you need to actively do something when your CLI program encounters an error, you have to state it explicitly.
-
-   Fortunately, **Mingling** provides a convenient interface for this functionality: inside the `gen_program!` macro, two `FallBack` types are generated
-
-|Type|When it occurs|How it occurs|
-|-|-|-|
-|RendererNotFound|When a renderer cannot be found for scheduling|Scheduled as a `Chain`|
-|DispatcherNotFound|When a command is entered but no dispatcher matches|Scheduled as a `Chain`|
-
-### The `DispatcherNotFound` Type
-
-   Let's first focus on the `DispatcherNotFound` type. It is produced as follows:
-
-```rust
-// 1. Define the `greet` command
-dispatcher!("greet", GreetCommand => GreetEntry);
- 
-fn main() {
-    // ->> User enters "hello Alice"
-    let mut program = ThisProgram::new();
- 
-    // 2. Import the `greet` command
-    program.with_dispatcher(GreetCommand);
- 
-    // 3. Execute the program
-    program.exec();
-}
- 
-// ... 
- 
-// 5. Receive the DispatcherNotFound dispatch
-#[renderer]
-fn dispatcher_not_found(prev: DispatcherNotFound) {
-    // 6. Output
-    r_println!(
-        "Cannot match any command! Current input: \"{}\"",
-        prev.join(" ")
-    );
-}
- 
-// 4. Cannot match any dispatcher named `hello`
-//    Forward the user's arguments as-is to DispatcherNotFound
-gen_program!(); 
-```
- 
-   The output of the above program is:
-
-```bash
-~> omg hello
-Cannot match any command! Current input: "hello"
- 
-~> omg hello Alice
-Cannot match any command! Current input: "hello Alice"
-```
- 
-   Now, if the user enters a command that doesn't match, **Mingling** will output the appropriate message!
-
-## The `RendererNotFound` Type
-
-   `RendererNotFound` can be produced in two ways:
-
-   1. The type was explicitly dispatched to a `Renderer` (using the `.to_render()` function), but the type does not have a renderer implementation
-   2. The type was dispatched to a `Chain`, but the type has neither a chain nor a renderer implementation
-
-   Generally, `RendererNotFound` **should not occur in business logic**: its dispatch means your type needs to be rendered but can't be. You can use this type to pinpoint which type is missing a renderer implementation ✏️
-
-```rust
-dispatcher!("greet", GreetCommand => GreetEntry);
- 
-fn main() {
-    let mut program = ThisProgram::new();
- 
-    program.with_dispatcher(GreetCommand);
-    program.exec();
-}
- 
-pack!(ResultGreetSomeone = String);
- 
-#[chain]
-fn handle_greet_entry(prev: GreetEntry) -> Next {
-    let args = prev.inner;
-    let name = args.first().cloned().unwrap_or_else(|| "World".to_string());
- 
-    ResultGreetSomeone::new(name)
-}
- 
-// Let's intentionally remove the renderer implementation for `ResultGreetSomeone`
-// #[renderer]
-// fn render_greet_someone(prev: ResultGreetSomeone) {
-//     r_println!("Hello, {}!", *prev);
-// }
- 
-#[renderer]
-fn renderer_not_found(prev: RendererNotFound) {
-    if *prev == "DispatcherNotFound" {
-        return; // Exclude the "DispatcherNotFound" type
-    }
- 
-    // Trigger `panic!` when a renderer is not found
-    panic!("Renderer \"{}\" not found!", *prev);
-}
- 
-gen_program!();
- 
-```
- 
-   The output of the above program is:
-
-```bash
-~> your-bin greet Alice
- 
-thread 'main' (90772) panicked at src/bin/your-bin.rs:30:5:
-Renderer "ResultGreetSomeone" not found!
-note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
-```
- 
-  The above is the fallback mechanism of **Mingling**. In the next chapter, you will learn how to use `Picker` to parse complex user inputs.
- 
-<p align="center" style="font-size: 0.85em; color: gray;">
-    Written by @Weicao-CatilGrass
-</p>