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//! How to use the heap and a dynamic memory allocator
//!
//! To compile this example you'll need to build the collections crate as part
//! of the Xargo sysroot. To do that change the Xargo.toml file to look like
//! this:
//!
//! ``` text
//! [dependencies.core]
//! stage = 0
//!
//! [dependencies.collections] # NEW
//! stage = 0
//!
//! [dependencies.compiler_builtins]
//! stage = 1
//! ```
//!
//! 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
//! ```
//!
//! ---
//!
//! ```
//!
//! #[allow(deprecated)]
//! #![feature(collections)]
//! #![feature(used)]
//! #![no_std]
//!
//! // This is the allocator crate; you can use a different one
//! extern crate alloc_cortex_m;
//! #[macro_use]
//! extern crate collections;
//! extern crate cortex_m;
//! extern crate cortex_m_rt;
//! extern crate cortex_m_semihosting;
//!
//! use core::fmt::Write;
//!
//! use cortex_m::asm;
//! use cortex_m_semihosting::hio;
//!
//! fn main() {
//! // Initialize the allocator
//! unsafe {
//! extern "C" {
//! // Start of the heap
//! static mut _sheap: usize;
//! }
//!
//! // Size of the heap in words (1 word = 4 bytes)
//! // NOTE The bigger the heap the greater the chance to run into a stack
//! // overflow (collision between the stack and the heap)
//! const SIZE: isize = 256;
//!
//! // End of the heap
//! let _eheap = (&mut _sheap as *mut _).offset(SIZE);
//!
//! alloc_cortex_m::init(&mut _sheap, _eheap);
//! }
//!
//! // Growable array allocated on the heap
//! let xs = vec![0, 1, 2];
//!
//! let mut stdout = hio::hstdout().unwrap();
//! writeln!(stdout, "{:?}", xs).unwrap();
//! }
//!
//! // As we are not using interrupts, we just register a dummy catch all handler
//! #[link_section = ".vector_table.interrupts"]
//! #[used]
//! static INTERRUPTS: [extern "C" fn(); 240] = [default_handler; 240];
//!
//! extern "C" fn default_handler() {
//! asm::bkpt();
//! }
//! ```
// Auto-generated. Do not modify.