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    //! How to use the heap and a dynamic memory allocator
    //!
    //! This example depends on the alloc-cortex-m crate so you'll have to add it to your Cargo.toml:
    //!
    //! ``` text
    //! # or edit the Cargo.toml file manually
    //! $ cargo add alloc-cortex-m
    //! ```
    //!
    //! ---
    //!
    //! ```
    //!
    //! #![feature(alloc)]
    //! #![feature(global_allocator)]
    //! #![feature(lang_items)]
    //! #![no_main]
    //! #![no_std]
    //!
    //! // This is the allocator crate; you can use a different one
    //! extern crate alloc_cortex_m;
    //! #[macro_use]
    //! extern crate alloc;
    //! extern crate cortex_m;
    //! #[macro_use]
    //! extern crate cortex_m_rt as rt;
    //! extern crate cortex_m_semihosting as sh;
    //! extern crate panic_semihosting;
    //!
    //! use core::fmt::Write;
    //!
    //! use alloc_cortex_m::CortexMHeap;
    //! use cortex_m::asm;
    //! use rt::ExceptionFrame;
    //! use sh::hio;
    //!
    //! // this is the allocator the application will use
    //! #[global_allocator]
    //! static ALLOCATOR: CortexMHeap = CortexMHeap::empty();
    //!
    //! const HEAP_SIZE: usize = 1024; // in bytes
    //!
    //! entry!(main);
    //!
    //! fn main() -> ! {
    //!     // Initialize the allocator BEFORE you use it
    //!     unsafe { ALLOCATOR.init(rt::heap_start() as usize, HEAP_SIZE) }
    //!
    //!     // Growable array allocated on the heap
    //!     let xs = vec![0, 1, 2];
    //!
    //!     let mut stdout = hio::hstdout().unwrap();
    //!     writeln!(stdout, "{:?}", xs).unwrap();
    //!
    //!     loop {}
    //! }
    //!
    //! // define what happens in an Out Of Memory (OOM) condition
    //! #[lang = "oom"]
    //! #[no_mangle]
    //! pub fn rust_oom() -> ! {
    //!     asm::bkpt();
    //!
    //!     loop {}
    //! }
    //!
    //! exception!(HardFault, hard_fault);
    //!
    //! fn hard_fault(ef: &ExceptionFrame) -> ! {
    //!     panic!("HardFault at {:#?}", ef);
    //! }
    //!
    //! exception!(*, default_handler);
    //!
    //! fn default_handler(irqn: i16) {
    //!     panic!("Unhandled exception (IRQn = {})", irqn);
    //! }
    //! ```
    // Auto-generated. Do not modify.

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