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I would love to see Rust with a REPL. I use Python professionally a lot and have done a fair amount of OCaml in my spare time and both have excellent REPls in

I would love to see Rust with a REPL. I use Python professionally a lot and have done a fair amount of OCaml in my spare time and both have excellent REPls in the form of `ipython` and `coretop`. Quick experiments with auto-complete is incredibly helpful for exploring a language. That's the only thing I really miss from those languages; when I want to wrap my head around a bit of syntax or a library feature in Rust, I build out a quick little experiment and see if it compiles and behaves as I expect it. With a good enough REPL, that's unneeded.

Cyph0n 10y ago
Scala does this extremely well too. Not sure whether or not a snippet will work? Run 'sbt console' and you're in a REPL with all of your code imported.
- joshmarlow 10y ago
  Something like `cargo shell` or `cargo repl` that automatically imports whatever crate you happen to be working in would be fantastic. If you had something like that, I imagine you could probably write a Kernel for Jupyter which would be a huge win.
manaskarekar 10y ago
Although not exactly a REPL, the rust playground has proven very useful to me for similar purposes. Of course, you need to be online. https://play.rust-lang.org/ https://play.rust-lang.org/
leshow 10y ago
coming from haskell too, i missed this. ghci is really fantastic.
bjz_ 10y ago
I heard a while back that there was some work going into an interpreter for rust's mid-level IR (MIR), with the intention being to support a REPL. Not sure how that is going though.
- tatterdemalion 10y ago
  The project you're thinking of is called miri, I don't really know the state of it either. https://github.com/solson/miri https://github.com/solson/miri
rascul 10y ago
There is rusti https://github.com/murarth/rusti https://github.com/murarth/rusti
hellofunk 10y ago
I assume you mean OCaml's "utop" ?
- joshmarlow 10y ago
  Technically yes. "utop" is the extended repl, but "coretop" is "utop" except it all ready has Jane Street Core loaded up.
agentgt 10y ago
For languages that do not have REPLs I usually just write unit tests. This works particularly well for Java as the Eclipse compiler iteratively compiles and most IDEs will let you run a single method. I imagine a similar stopgap could be used for Rust. I know its not the same but in some ways I have sort of disliked REPLs because its is very easy to accidentally delete or loose what you have type and you might as well make your playing around a test (just my 2 cents).
tmzt 10y ago
The Dyon[1] language would probably make a good basis for a repl for Rust. It shares many concepts with Rust including a version of ownership. [1] https://github.com/PistonDevelopers/dyon https://github.com/PistonDevelopers/dyon You might also be able to link the repl with Rust Language Server which could be linked with incremental compilation, letting you define modules or pub fn's dynamically.

Cyph0n 10y ago

Scala does this extremely well too. Not sure whether or not a snippet will work? Run 'sbt console' and you're in a REPL with all of your code imported.

joshmarlow 10y ago
Something like `cargo shell` or `cargo repl` that automatically imports whatever crate you happen to be working in would be fantastic. If you had something like that, I imagine you could probably write a Kernel for Jupyter which would be a huge win.

manaskarekar 10y ago

Although not exactly a REPL, the rust playground has proven very useful to me for similar purposes. Of course, you need to be online. https://play.rust-lang.org/ https://play.rust-lang.org/

leshow 10y ago

coming from haskell too, i missed this. ghci is really fantastic.

bjz_ 10y ago

I heard a while back that there was some work going into an interpreter for rust's mid-level IR (MIR), with the intention being to support a REPL. Not sure how that is going though.

tatterdemalion 10y ago
The project you're thinking of is called miri, I don't really know the state of it either. https://github.com/solson/miri https://github.com/solson/miri

rascul 10y ago

There is rusti https://github.com/murarth/rusti https://github.com/murarth/rusti

hellofunk 10y ago

I assume you mean OCaml's "utop" ?

joshmarlow 10y ago
Technically yes. "utop" is the extended repl, but "coretop" is "utop" except it all ready has Jane Street Core loaded up.

agentgt 10y ago

For languages that do not have REPLs I usually just write unit tests. This works particularly well for Java as the Eclipse compiler iteratively compiles and most IDEs will let you run a single method. I imagine a similar stopgap could be used for Rust. I know its not the same but in some ways I have sort of disliked REPLs because its is very easy to accidentally delete or loose what you have type and you might as well make your playing around a test (just my 2 cents).

tmzt 10y ago

The Dyon[1] language would probably make a good basis for a repl for Rust. It shares many concepts with Rust including a version of ownership. [1] https://github.com/PistonDevelopers/dyon https://github.com/PistonDevelopers/dyon You might also be able to link the repl with Rust Language Server which could be linked with incremental compilation, letting you define modules or pub fn's dynamically.