= note: libzmq-50f4a406b22aace0.rlib(zmq-50f4a406b22aace0.zmq.adwk1sko-cg
u.4.rcgu.o) : error LNK2019: unresolved external symbol __imp_zmq_msg_gets
referenced in function _ZN3zmq7message7Message4gets17h7fa806d7747a2351E
          libzmq-50f4a406b22aace0.rlib(zmq-50f4a406b22aace0.zmq.adwk1sko-cg
u.0.rcgu.o) : error LNK2019: unresolved external symbol __imp_zmq_proxy_ste
erable referenced in function _ZN3zmq15proxy_steerable17h28199adb82db8604E
          libzmq-50f4a406b22aace0.rlib(zmq-50f4a406b22aace0.zmq.adwk1sko-cg
u.0.rcgu.o) : error LNK2019: unresolved external symbol __imp_zmq_has refer
enced in function _ZN3zmq3has17h8a1799c5696eeb89E
          C:\Documents\rust\evcxr\target\debug\deps\evcxr_jupyter-04a8e2112
da4bb74.exe : fatal error LNK1120: 3 unresolved externals

I'm on Windows 10, first tried to cargo install evcxr-jupyter, got an error described here, then cloned the master branch and trying to build it. I've installed ZeroMQ 4.0.4 via installer, renamed lib and dll files as recommended and added .dll dir to PATH.

Compared to a Python Notebook, the speed feels slow. Running :timing, each block execution even for simple code is 5 to 10 seconds, and extern crate is really slow. I was hoping for something like notebook driven development like you can do in Python, but the speed doesn't seem to allow me to do so.

In the unlikely event that it already works on Mac OS, please let me know.

If you'd like to work on this, feel free to reach out with any questions. I'm not really sure what will be involved, since I don't know what the problems will be.

Hi,

This PR is a try to extend runtime with helpers and shortcuts but I need your feedback about:

1. Do you want to have some helpers / ready to function like gophernotes/Display.ipynb at master · gopherdata/gophernotes as part of the lib. Is evcxr_runtime the right place to add helpers / shortcut to display content from outside (serde_json, images, vega, ndarrays,...) ? or do you prefer
   1. to have them into each own sub-project (enabling rust features is not accessible from jupyter kernel)
   2. to have them into an other project / repository (not under evcxr repository)
   3. other suggestions ?
2. If ok for helpers, to you have some guidelines you would like we follow ?
3. how to play in jupyter/repl with an unpublished crates (wip,...) ?

Tell me before I push other helpers function.

If you like I can move the cherry-pick the first commit into an other PR.

Hello,

I added a button to start a dynamic version of this repo on Binder and the required config files (apt.txt and postBuild). I'm still trying to figure out why it doesn't work on the notebook, but if you open a terminal and run jupyter console --kernel rust it works fine.

This one points to the PR branch: where you can test and reproduce the problem.

Pinging @yuvipanda @betatim @choldgraf: is there any way to check the Binder logs (as an user) to see why the kernel initialization fails? (it works fine locally or on the terminal in Binder).

We've been working quite hard on updating the zmq crate to remove it's cmake dependency over the past few weeks. (https://github.com/jean-airoldie/zeromq-src-rs/pull/17 https://github.com/jean-airoldie/zeromq-src-rs/pull/18 )

Only https://github.com/erickt/rust-zmq/pull/339 now needs to be merged, and a new release needs to be created and we'd be good.

As a side-effect this most likely means (looks like it's only zmq that requires it in evcxr) that cmake can also be removed as a dependency for this project, it's readme etc.

Before:

In REPL:

in jupyter notebook:

After:

in REPL:

I didn't managed to make it working in jupyter notebook.

This PR is just a proof of concept, for giving feedback. It doesn't actually work for anything other than my example (I added a +20 offset for spans somewhere to make it working) and it should show helps and notes using ariadne as well (the currently rendered help is from old code). Ariadne has a very easy to use api, it gets a list of files with their sources (commands and cells in our use case) and a list of spans (declared with byte ranges) with messages and colors, then it will automatically render everything in the right place. So someone that know more than me (= more than nothing) about evcxr can do it the right way fairly easily. But I can also make it with some mentoring if needed.

Rust is famous for its great compile messages. Lets make them great in evcxr as well!

Rust 1.51.0 is now out, and it includes a new feature called "Const Generics" (well, not entirely new - but see the rust blog for all the details). This feature does not appear to work with evcxr-jupiter.

Here's a minimal test case -- I've made a Jupyter cell with this code (taken, slightly changed, from the blog entry linked above):

pub struct TestArray<T, const LENGTH: usize> {
    //                 ^^^^^^^^^^^^^^^^^^^ Const generic definition.
    pub list: [T; LENGTH]
    //        ^^^^^^ We use it here.
}

let test_array = TestArray::<u8,42>{ list: [0u8; 42] };

assert_eq!( test_array.list.len(), 42 );

test_array.list

I get the following output:

pub struct TestArray<T, const LENGTH: usize> { ^ pub struct TestArray<T, const LENGTH: usize> { ^^^^^^ pub struct TestArray<T, const LENGTH: usize> { ^^^^^^^^^ struct defined here, with 2 generic parameters: T, LENGTH

However, when I put that code in the crate I'm working on (as a test case), it compiles and runs just fine!

I tried reinstalling evcxr-jupyter to see if that would help it use the latest rust version, with no luck. I suppose I may have broken something in the process, so I'm very curious if it's just my environment. Does that code work for anyone else?

I haven't tried cloning the repository to make sure I have the bleeding edge version. Would it be helpful if I did, or should I just be patient for a new version to come out (and use "cargo install")?

Thanks in advance!

When I run

cargo install evcxr_repl

on my Mac running High Sierra version 10.13.6, the build fails with

error[E0046]: not all trait items implemented, missing: `description`
   --> /Users/alan/.cargo/registry/src/github.com-1ecc6299db9ec823/evcxr-0.1.2/src/errors.rs:314:1
    |
314 | impl std::error::Error for Error {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `description` in implementation
    |
    = note: `description` from trait: `fn(&Self) -> &str`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0046`.
error: failed to compile `evcxr_repl v0.1.2`, intermediate artifacts can be found at `/var/folders/9t/_qss6y9544v29s4y30lkz5jr0000gn/T/cargo-install5FRvBt`

Caused by:
  Could not compile `evcxr`.

To learn more, run the command again with --verbose.

I am running

cargo 1.26.0-nightly (008c36908 2018-04-13)

One clue to the problem is that I am using the Failure crate, which has its own Error trait.

   Compiling sig v1.0.0
error[E0425]: cannot find value `SIGSTKFLT` in crate `libc`
   --> /User/.cargo/registry/src/github.com-1ecc6299db9ec823/sig-1.0.0/src/ffi.rs:32:38
    |
32  |     pub const STKFLT : c_int = libc::SIGSTKFLT; // Stack fault.
    |                                      ^^^^^^^^^ help: a constant with a similar name exists: `SIGSTKSZ`
    |
   ::: /User/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.73/src/unix/bsd/freebsdlike/freebsd/mod.rs:348:1
    |
348 | pub const SIGSTKSZ: ::size_t = MINSIGSTKSZ + 32768;
    | --------------------------------------------------- similarly named constant `SIGSTKSZ` defined here

error[E0425]: cannot find value `SIGPOLL` in crate `libc`
   --> /User/.cargo/registry/src/github.com-1ecc6299db9ec823/sig-1.0.0/src/ffi.rs:43:38
    |
43  |     pub const POLL   : c_int = libc::SIGPOLL;   // Pollable event occured (System V).
    |                                      ^^^^^^^ help: a constant with a similar name exists: `SIGILL`
    |
   ::: /User/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.73/src/unix/bsd/freebsdlike/mod.rs:438:1
    |
438 | pub const SIGILL: ::c_int = 4;
    | ------------------------------ similarly named constant `SIGILL` defined here

error[E0425]: cannot find value `SIGPWR` in crate `libc`
  --> /User/.cargo/registry/src/github.com-1ecc6299db9ec823/sig-1.0.0/src/ffi.rs:44:38
   |
44 |     pub const PWR    : c_int = libc::SIGPWR;    // Power failure restart (System V).
   |                                      ^^^^^^ not found in `libc`

error: aborting due to 3 previous errors

System: FreeBSD 12.1, x86_64

I'm interested in packaging this tool using Nix. There was a long thread here about how to do so for a crate that doesn't include Cargo.lock in version control, and the conclusion seems to be that the easiest thing is to just add it :)

Since this project produces binaries, it seems to be recommended by the Cargo book to include it as well.

Hi, I got this error:

❯ evcxr --version
evcxr 0.14.1

❯ evcxr                                                          
Welcome to evcxr. For help, type :help
>> use std::io::*;
>> let mut f = std::fs::File::create("/tmp/test.txt");
A compilation error was found in code we generated.
Ideally this shouldn't happen. Type :last_error_json to see details.
error[E0107]: this type alias takes 1 generic argument but 2 generic arguments were supplied
   --> src/lib.rs:105:37
    |
105 | evcxr_variable_store.put_variable::<Result<std::fs::File, Error>>(stringify!(f), f);
    |                                     ^^^^^^                ----- help: remove this generic argument
    |                                     |
    |                                     expected 1 generic argument
    |
note: type alias defined here, with 1 generic parameter: `T`
   --> /home/noam.raphael/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/io/error.rs:55:10
    |
55  | pub type Result<T> = result::Result<T, Error>;
    |          ^^^^^^ -

I understand that this is because the generated code contains Result<std::fs::File, Error>, meaning std::result::Result, but because I first wrote use std::io::*;, Result is now std::io::Result.

A solution may be to always use fully qualified names.

Hi, while playing around with evcxr, this happened:

> evcxr.exe
Welcome to evcxr. For help, type :help
>> :version
0.14.1
>> :dep chrono
>> use chrono::prelude::*;
>> let d = NaiveDate::from_ymd(1899, 12, 30).and_hms_opt(0, 0, 0).unwrap();
>> let t = d.timestamp_nanos();
>> let du = DateTime::<Utc>::from_utc(d, Utc);
>> let dur = Utc::now().signed_duration_since(du);
>> dur.num_nanoseconds().unwrap() as f64 / (24u64 * 60 * 60 * 1000 * 1000 * 1000) as f64
A compilation error was found in code we generated.
Ideally this shouldn't happen. Type :last_error_json to see details.
error: linking with `lld-link` failed: exit code: 1
  |
  = note: "lld-link" "-flavor" "link" "/DEF:C:\\Users\\me\\AppData\\Local\\Temp\\rustcNZzBWn\\lib.def" "/NOLOGO" "C:\\Users\\me\\AppData\\Local\\Temp\\rustcNZzBWn\\symbols.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.12atrhqi74trn5mb.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.2ac7pmkvmksmy6wb.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.2re88lt95otfy0w4.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.2wmrm1a4c4r65re5.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.3nhko0fabcdela7r.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.3zps00ctwzkhrslp.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.41hj8h78u5md7cyj.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.4drmnco5vucp36hh.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.4giv3bh98brb2zr4.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.4p9ftw3of43ppcgs.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.525wab2pbeh7bgef.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.5289e4dnx9byx3kq.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.565vwebamg7mgqw9.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.8ypx8eubo3hg0y9.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.mi1xbcpcn2rjrxa.rcgu.o" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.zvvreuktax44vh3.rcgu.o" "/LIBPATH:C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps" "/LIBPATH:C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\debug\\deps" "/LIBPATH:C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\libchrono-56d42aefdbc0c18c.rlib" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\libnum_integer-0913fcd74c05fe81.rlib" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\libnum_traits-9232c041a8b35275.rlib" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\libtime-2a05c0525cd72a6b.rlib" "C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\libwinapi-555ed678803c0e09.rlib" "/LIBPATH:C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib" "std-f486e2d37cdf4887.dll.lib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib\\libcompiler_builtins-26678f31fd200488.rlib" "advapi32.lib" "gdi32.lib" "kernel32.lib" "msimg32.lib" "ole32.lib" "opengl32.lib" "runtimeobject.lib" "winspool.lib" "kernel32.lib" "advapi32.lib" "userenv.lib" "kernel32.lib" "ws2_32.lib" "bcrypt.lib" "msvcrt.lib" "legacy_stdio_definitions.lib" "/NXCOMPAT" "/LIBPATH:C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib" "/OUT:C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.dll" "/OPT:REF,ICF" "/DLL" "/IMPLIB:C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.dll.lib" "/DEBUG" "/NATVIS:C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\etc\\intrinsic.natvis" "/NATVIS:C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\etc\\liballoc.natvis" "/NATVIS:C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\etc\\libcore.natvis" "/NATVIS:C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\etc\\libstd.natvis" "-fuse-ld=lld" "-fuse-ld=lld"
  = note: lld-link: warning: ignoring unknown argument '-fuse-ld=lld'
          lld-link: warning: ignoring unknown argument '-fuse-ld=lld'
          lld-link: error: undefined symbol: core::ptr::drop_in_place$LT$alloc..boxed..Box$LT$dyn$u20$core..any..Any$u2b$core..marker..Send$GT$$GT$::h8d0ca8bb2e7ead95
          >>> referenced by C:\Users\me\AppData\Local\Temp\.tmpV4jX6B\target\x86_64-pc-windows-msvc\debug\deps\ctx.2ac7pmkvmksmy6wb.rcgu.o:(core::ptr::drop_in_place$LT$core..result..Result$LT$$LP$$RP$$C$alloc..boxed..Box$LT$dyn$u20$core..any..Any$u2b$core..marker..Send$GT$$GT$$GT$::hd6a5c20c25c61733)
          >>> referenced by C:\Users\me\AppData\Local\Temp\.tmpV4jX6B\target\x86_64-pc-windows-msvc\debug\deps\ctx.2ac7pmkvmksmy6wb.rcgu.o:($ehgcr_1_8)



>> :last_error_json
Error: {"rendered":"error: linking with `lld-link` failed: exit code: 1\n  |\n  = note: \"lld-link\" \"-flavor\" \"link\" \"/DEF:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\rustcNZzBWn\\\\lib.def\" \"/NOLOGO\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\rustcNZzBWn\\\\symbols.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.12atrhqi74trn5mb.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.2ac7pmkvmksmy6wb.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.2re88lt95otfy0w4.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.2wmrm1a4c4r65re5.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.3nhko0fabcdela7r.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.3zps00ctwzkhrslp.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.41hj8h78u5md7cyj.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.4drmnco5vucp36hh.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.4giv3bh98brb2zr4.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.4p9ftw3of43ppcgs.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.525wab2pbeh7bgef.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.5289e4dnx9byx3kq.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.565vwebamg7mgqw9.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.8ypx8eubo3hg0y9.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.mi1xbcpcn2rjrxa.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.zvvreuktax44vh3.rcgu.o\" \"/LIBPATH:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\" \"/LIBPATH:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\debug\\\\deps\" \"/LIBPATH:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\x86_64-pc-windows-msvc\\\\lib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libchrono-56d42aefdbc0c18c.rlib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libnum_integer-0913fcd74c05fe81.rlib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libnum_traits-9232c041a8b35275.rlib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libtime-2a05c0525cd72a6b.rlib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libwinapi-555ed678803c0e09.rlib\" \"/LIBPATH:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\x86_64-pc-windows-msvc\\\\lib\" \"std-f486e2d37cdf4887.dll.lib\" \"C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\x86_64-pc-windows-msvc\\\\lib\\\\libcompiler_builtins-26678f31fd200488.rlib\" \"advapi32.lib\" \"gdi32.lib\" \"kernel32.lib\" \"msimg32.lib\" \"ole32.lib\" \"opengl32.lib\" \"runtimeobject.lib\" \"winspool.lib\" \"kernel32.lib\" \"advapi32.lib\" \"userenv.lib\" \"kernel32.lib\" \"ws2_32.lib\" \"bcrypt.lib\" \"msvcrt.lib\" \"legacy_stdio_definitions.lib\" \"/NXCOMPAT\" \"/LIBPATH:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\x86_64-pc-windows-msvc\\\\lib\" \"/OUT:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.dll\" \"/OPT:REF,ICF\" \"/DLL\" \"/IMPLIB:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.dll.lib\" \"/DEBUG\" \"/NATVIS:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\etc\\\\intrinsic.natvis\" \"/NATVIS:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\etc\\\\liballoc.natvis\" \"/NATVIS:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\etc\\\\libcore.natvis\" \"/NATVIS:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\etc\\\\libstd.natvis\" \"-fuse-ld=lld\" \"-fuse-ld=lld\"\n  = note: lld-link: warning: ignoring unknown argument '-fuse-ld=lld'\n          lld-link: warning: ignoring unknown argument '-fuse-ld=lld'\n          lld-link: error: undefined symbol: core::ptr::drop_in_place$LT$alloc..boxed..Box$LT$dyn$u20$core..any..Any$u2b$core..marker..Send$GT$$GT$::h8d0ca8bb2e7ead95\n          >>> referenced by C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.2ac7pmkvmksmy6wb.rcgu.o:(core::ptr::drop_in_place$LT$core..result..Result$LT$$LP$$RP$$C$alloc..boxed..Box$LT$dyn$u20$core..any..Any$u2b$core..marker..Send$GT$$GT$$GT$::hd6a5c20c25c61733)\n          >>> referenced by C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.2ac7pmkvmksmy6wb.rcgu.o:($ehgcr_1_8)\n          \n\n","children":[{"children":[],"code":null,"level":"note","message":"\"lld-link\" \"-flavor\" \"link\" \"/DEF:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\rustcNZzBWn\\\\lib.def\" \"/NOLOGO\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\rustcNZzBWn\\\\symbols.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.12atrhqi74trn5mb.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.2ac7pmkvmksmy6wb.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.2re88lt95otfy0w4.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.2wmrm1a4c4r65re5.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.3nhko0fabcdela7r.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.3zps00ctwzkhrslp.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.41hj8h78u5md7cyj.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.4drmnco5vucp36hh.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.4giv3bh98brb2zr4.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.4p9ftw3of43ppcgs.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.525wab2pbeh7bgef.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.5289e4dnx9byx3kq.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.565vwebamg7mgqw9.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.8ypx8eubo3hg0y9.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.mi1xbcpcn2rjrxa.rcgu.o\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.zvvreuktax44vh3.rcgu.o\" \"/LIBPATH:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\" \"/LIBPATH:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\debug\\\\deps\" \"/LIBPATH:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\x86_64-pc-windows-msvc\\\\lib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libchrono-56d42aefdbc0c18c.rlib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libnum_integer-0913fcd74c05fe81.rlib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libnum_traits-9232c041a8b35275.rlib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libtime-2a05c0525cd72a6b.rlib\" \"C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\libwinapi-555ed678803c0e09.rlib\" \"/LIBPATH:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\x86_64-pc-windows-msvc\\\\lib\" \"std-f486e2d37cdf4887.dll.lib\" \"C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\x86_64-pc-windows-msvc\\\\lib\\\\libcompiler_builtins-26678f31fd200488.rlib\" \"advapi32.lib\" \"gdi32.lib\" \"kernel32.lib\" \"msimg32.lib\" \"ole32.lib\" \"opengl32.lib\" \"runtimeobject.lib\" \"winspool.lib\" \"kernel32.lib\" \"advapi32.lib\" \"userenv.lib\" \"kernel32.lib\" \"ws2_32.lib\" \"bcrypt.lib\" \"msvcrt.lib\" \"legacy_stdio_definitions.lib\" \"/NXCOMPAT\" \"/LIBPATH:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\x86_64-pc-windows-msvc\\\\lib\" \"/OUT:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.dll\" \"/OPT:REF,ICF\" \"/DLL\" \"/IMPLIB:C:\\\\Users\\\\me\\\\AppData\\\\Local\\\\Temp\\\\.tmpV4jX6B\\\\target\\\\x86_64-pc-windows-msvc\\\\debug\\\\deps\\\\ctx.dll.lib\" \"/DEBUG\" \"/NATVIS:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\etc\\\\intrinsic.natvis\" \"/NATVIS:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\etc\\\\liballoc.natvis\" \"/NATVIS:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\etc\\\\libcore.natvis\" \"/NATVIS:C:\\\\Users\\\\me\\\\.rustup\\\\toolchains\\\\nightly-x86_64-pc-windows-msvc\\\\lib\\\\rustlib\\\\etc\\\\libstd.natvis\" \"-fuse-ld=lld\" \"-fuse-ld=lld\"","rendered":null,"spans":[]},{"children":[],"code":null,"level":"note","message":"lld-link: warning: ignoring unknown argument '-fuse-ld=lld'\r\nlld-link: warning: ignoring unknown argument '-fuse-ld=lld'\r\nlld-link: error: undefined symbol: core::ptr::drop_in_place$LT$alloc..boxed..Box$LT$dyn$u20$core..any..Any$u2b$core..marker..Send$GT$$GT$::h8d0ca8bb2e7ead95\r\n>>> referenced by C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.2ac7pmkvmksmy6wb.rcgu.o:(core::ptr::drop_in_place$LT$core..result..Result$LT$$LP$$RP$$C$alloc..boxed..Box$LT$dyn$u20$core..any..Any$u2b$core..marker..Send$GT$$GT$$GT$::hd6a5c20c25c61733)\r\n>>> referenced by C:\\Users\\me\\AppData\\Local\\Temp\\.tmpV4jX6B\\target\\x86_64-pc-windows-msvc\\debug\\deps\\ctx.2ac7pmkvmksmy6wb.rcgu.o:($ehgcr_1_8)\r\n","rendered":null,"spans":[]}],"code":null,"level":"error","message":"linking with `lld-link` failed: exit code: 1","spans":[]}

>>

I find it very useful to see the type of expressions. So I tried to add this feature to evcxr. What I did works like this:

>> :t
Types: true

>> 3 + 5
: i32 = 8
>> "hello"
: &str = "hello"
>> Some("hello".to_string())
: Option<String> = Some("hello")
>> vec![1, 2, 3]
: Vec<i32> = [1, 2, 3]

To get the type names I used std::any::type_name(), and added a function which only leaves the last part of paths, so it converts core::option::Option<alloc::string::String> into Option<String>, which is much easier on the eyes.

Things which I chose arbitrarily and should be decided:

• The name of the command (:t)
• The format (I used : <type> = <repr>)

A note: for shortening the name I pushed a function (evcxr_shorten_type) into the child. It's quite long, and has some intricate logic, because it had to be written without relying on regex. I think it would be better to send the raw type string along with the value, and shorten it at the main process using regex. If the concept is approved, I would be happy to try it. For now, it was simpler for me to avoid changing the interface between the processes and instead add the string on the child side.

What do you think?

Thanks, Noam

I've installed a fresh installation of tljh and evcxr but I can't connect to evcxr kernel

even though ipython works fine

and /home/user/.cargo/bin is present in PATH.

Here are the contents of ~/.local/share/jupyter/kernels/rust/kernel.json

How can I check what's wrong?

I have a local crate which I want to load into the notebook, I load the crate like this:

:dep coordinate_system = { package = "coordinate_system", path = "coordinate_system", version = "*" }

The notebook and the crate live side by side so the path is correct I think, and the notebook doesn't complain about the above line.

Then in the next line I use the crate:

use coordinate_system;

Here the notebook shows an error:

[E0432] Error: unresolved import `coordinate_system`