+#### `[rust]`:
+- `debuginfo = true` - Build a compiler with debuginfo
+- `optimize = false` - Disable optimizations to speed up compilation of stage1 rust
+
+For more options, the `config.toml` file contains commented out defaults, with
+descriptions of what each option will do.
+
+Note: Previously the `./configure` script was used to configure this
+project. It can still be used, but it's recommended to use a `config.toml`
+file. If you still have a `config.mk` file in your directory - from
+`./configure` - you may need to delete it for `config.toml` to work.