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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.