panic - Rust By Example
Description: Rust by Example (RBE) is a collection of runnable examples that illustrate various Rust concepts and standard libraries.

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# `panic`

`panic`は、最もシンプルなエラーハンドリングの仕組みです。エラーメッセージの出力、スタックの巻き戻し、そして多くの場合プログラムの終了を実行します。例として、エラー条件に対して明示的に`panic`を呼び出してみましょう。

    fn drink(beverage: &str) {
        // You shouldn't drink too many sugary beverages.
        if beverage == "lemonade" { panic!("AAAaaaaa!!!!"); }

        println!("Some refreshing {} is all I need.", beverage);
    }

    fn main() {
        drink("water");
        drink("lemonade");
        drink("still water");
    }

The first call to `drink` works. The second panics and thus the third is never called.