Implement a Rust REPL

[teratorn]

REPLs are great.

[brson]

It's true, REPLs are great!

[kud1ing]

See also https://github.com/killerswan/rustx

[bstrie]

See also https://github.com/bleibig/rust-repl

[mcandre]

REPLs are indespensible. CL sucks, but I'd almost rather use it than a better language without a good REPL.

[bstrie]

Until bleibig's REPL is stable, feel free to use my stable-ish REPL-ish sort of thing: https://github.com/bstrie/rust-rustic

(But this is by no means a long-term solution.)

[graydon]

great. longer term I concur we should fold something like bleibig's repl into rustc. an --interactive flag would be great.

[mcandre]

--interactive would be helpful.

Suggestion: When argc < 1, default to interactive like scripting languages do.

[dbp]

Somewhat along the same lines as bstrie's rustic, here is a repl that I wrote. The main difference is that it behaves somewhat like a future repl based on LLVM's interpreter probably should behave (ie, statement by statement evaluation, local definitions, imports, etc), but under the hood it is a hack - it is writing out temp files and using rustc to compile them. either way, it is really fun to use, and works right now!

http://github.com/dbp/rustrepl

[catamorphism]

This exists now (rusti) but is not working too well right now: #4407

[kud1ing]

Is the scope of this issue "create a REPL" fulfilled?

[bstrie]

@kud1ing probably. Separate issues can be opened to address the current REPL breakage.

[brson]

Closing.