[erlang-questions] Erlang VM in Rust

Daniel Goertzen <>
Wed Sep 13 21:46:08 CEST 2017

- Rust got C-like unions as of 1.19 (20 July 2017).  This is primarily for
interfacing with C code; in native Rust you almost always opt for enums
(aka tagged unions, sum types).

- Rust does not have bitfields but it does have the same bit mashing
operators as C (& | ^ !  << >>).   C bitfields have different memory
layouts on different platforms which limits their usefulness.  All the
microcontroller C code I've ever seen has opted for explicit bit mashing
instead of bitfields.

- There is an OS written in Rust, https://www.redox-os.org/ .  The drivers
are all in Rust.

On Tue, Sep 12, 2017 at 9:27 PM zxq9 <> wrote:

> On 2017年09月13日 水曜日 01:47:08 Thom Cherryhomes wrote:
> > For a language that purports to be a replacement for low-level systems
> > programming, Rust not having bitfields or unions, would be a real pain in
> > the ass to do any intricate hardware driver work... I'm guessing that
> Rust
> > is designed by 20-somethings who have never done a line of assembler in
> > their lives?
> That is curious. I wonder if these have been deferred for the time being
> in favor of using C as an extension (as Rust conforms to the C ABI)?
> -Craig
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