What does HackerNews think of luster?

I wish there was a Lua implementation in pure Rust (I understand about likely performance degradation compared to LuaJIT). There's incomplete Luster[1], but it's still unusable.

[1] https://github.com/kyren/luster

There's also Luster[1].

[1] https://github.com/kyren/luster

There's also Lua implementation (incomplete) in Rust - Luster[1].

[1] https://github.com/kyren/luster

Tossing my hat in for Passerine [1]. Gorgeous ML inspired syntax. Written in Rust, and I suspect scripting Rust libraries is in the cards.

Dreaming here: Lua is a fantastic scripting language, but the Rust FFI isn’t as ergonomic as it could be. Enter Luster [2], which is basically LuaJIT rewritten in Rust.

Embedding a scripting language in a Rust application gives you tons of power (e.g. scripting Rust structs from Lua [3]), and setting this up isn’t terribly difficult.

[1]: https://github.com/vrtbl/passerine

[2]: https://github.com/kyren/luster

[3]: https://git.sr.ht/~ioiojo/kiwi

> The use of a special kind of lifetime annotation, where the lifetime has to match exactly, can be used to get around this limitation.

This is already expressible in Rust, using invariant lifetimes. You can hand someone an opaque invariant lifetime, let them build a mutable cyclic data structure with it, and then pass that data structure around.

This use of invariant lifetimes, called "generativity," is described in more detail here (https://raw.githubusercontent.com/Gankro/thesis/master/thesi...) in section 6.3, which describes a way to use lifetimes as unique tokens for all sorts of use cases.

And even more closely aligned with what the article is talking about, Catherine West has put together a library that uses generativity to provide a safe interface to a garbage collected heap, as part of a reimplementation of Lua: the `gc-arena` crate in https://github.com/kyren/luster