Followed by the OS Guide
Use the nightly compiler and add the following configuration to ~/.cargo/config.toml:
[unstable]
build-std = ["core", "compiler_builtins", "alloc"]
build-std-features = ["compiler-builtins-mem"]
[target.'cfg(target_os = "none")']
runner = "bootimage runner"
Build: make build
Run: make run
To run the tests use make test and to test heap allocations run make test_alloc.