update the minimal example

Author: japaric

examples/minimal.rs

@@ -15,14 +15,6 @@
 //! define a panicking behavior is to link to a [panic handler crate][0]
 //!
 //! [0]: https://crates.io/keywords/panic-impl
-//!
-//! - Define the `HardFault` handler using the [`exception!`] macro. This handler (function) is
-//! called when a hard fault exception is raised by the hardware.
-//!
-//! [`exception!`]: https://docs.rs/cortex-m-rt/~0.5/cortex_m_rt/macro..html
-//!
-//! - Define a default handler using the [`exception!`] macro. This function will be used to handle
-//! all interrupts and exceptions which have not been assigned a specific handler.
 
 #![no_main] // <- IMPORTANT!
 #![no_std]
@@ -47,17 +39,3 @@ fn main() -> ! {
         asm::bkpt();
     }
 }
-
-// define the hard fault handler
-exception!(HardFault, hard_fault);
-
-fn hard_fault(ef: &ExceptionFrame) -> ! {
-    panic!("HardFault at {:#?}", ef);
-}
-
-// define the default exception handler
-exception!(*, default_handler);
-
-fn default_handler(irqn: i16) {
-    panic!("Unhandled exception (IRQn = {})", irqn);
-}