src/doc/rust-by-example/src/error/panic.md

   1 # `panic`
   2
   3 The simplest error handling mechanism we will see is `panic`. It prints an
   4 error message, starts unwinding the stack, and usually exits the program.
   5 Here, we explicitly call `panic` on our error condition:
   6
   7 ```rust,editable,ignore,mdbook-runnable
   8 fn drink(beverage: &str) {
   9     // You shouldn't drink too much sugary beverages.
  10     if beverage == "lemonade" { panic!("AAAaaaaa!!!!"); }
  11
  12     println!("Some refreshing {} is all I need.", beverage);
  13 }
  14
  15 fn main() {
  16     drink("water");
  17     drink("lemonade");
  18 }
  19 ```