Doesn't compile in WSL with ubuntu 20.04

[IceSentry]

Please complete the following tasks

• I have searched the discussions
• I have searched the existing issues

Rust Version

rustc 1.52.1 (9bc8c42bb 2021-05-09)

Clap Version

3.0.0-beta.2

Minimal reproducible code

fn main() {
	println!("Hello, world!");
}

in Cargo.toml

[package]
name = "clap-test"
version = "0.1.0"
authors = ["author"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
clap = "3.0.0-beta.2"

Steps to reproduce the bug with the above code

run cargo build in wsl with ubuntu 20.04

Actual Behaviour

 > cargo build
   Compiling clap v3.0.0-beta.2
error[E0107]: this struct takes 3 type arguments but only 2 type arguments were supplied
  --> /home/<username>/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-3.0.0-beta.2/src/parse/matches/arg_matches.rs:77:22
   |
77 |     pub(crate) args: IndexMap<Id, MatchedArg>,
   |                      ^^^^^^^^ --  ---------- supplied 2 type arguments
   |                      |
   |                      expected 3 type arguments
   |
note: struct defined here, with 3 type parameters: `K`, `V`, `S`
  --> /home/<username>/.cargo/registry/src/github.com-1ecc6299db9ec823/indexmap-1.6.2/src/map.rs:76:12
   |
76 | pub struct IndexMap<K, V, S> {
   |            ^^^^^^^^ -  -  -
help: add missing type argument
   |
77 |     pub(crate) args: IndexMap<Id, MatchedArg, S>,
   |                                             ^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0107`.
error: could not compile `clap`

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

Expected Behaviour

Compiles successfully when added as a dependency

Additional Context

I recently completely reinstalled wsl with ubuntu 20.04 and I have nothing but the rust toolchain installed on top of the default installation and anything required to compile rust projects. I can compile other projects that do not use clap. Yes, I ran an apt update and apt upgrade. I tried building a project using clap and saw this output. I then reproduced the bug by adding the dependency to an empty project and I saw the same output of clap not being able to compile.

I know this works correctly in my windows install, but I also compiled that project yesterday in a ubuntu 18.04 not through wsl and it worked.

I'm not sure if the issue is with WSL or ubuntu 20.04

Debug Output

No response

[pksunkara]

This looks like nothing wsl or Ubuntu related. Just pure rust issue. But I don't understand why indexmap is failing to compile.

…

On Sun, Jun 13, 2021, 18:32 Charles Giguere ***@***.***> wrote: Please complete the following tasks - I have searched the discussions <https://github.com/clap-rs/clap/discussions> - I have searched the existing issues Rust Version rustc 1.52.1 (9bc8c42bb 2021-05-09) Clap Version 3.0.0-beta.2 Minimal reproducible code fn main() { println!("Hello, world!"); } in Cargo.toml [package]name = "clap-test"version = "0.1.0"authors = ["author"]edition = "2018" # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html [dependencies]clap = "3.0.0-beta.2" Steps to reproduce the bug with the above code run cargo build in wsl with ubuntu 20.04 Actual Behaviour > cargo build Compiling clap v3.0.0-beta.2 error[E0107]: this struct takes 3 type arguments but only 2 type arguments were supplied --> /home/<username>/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-3.0.0-beta.2/src/parse/matches/arg_matches.rs:77:22 | 77 | pub(crate) args: IndexMap<Id, MatchedArg>, | ^^^^^^^^ -- ---------- supplied 2 type arguments | | | expected 3 type arguments | note: struct defined here, with 3 type parameters: `K`, `V`, `S` --> /home/<username>/.cargo/registry/src/github.com-1ecc6299db9ec823/indexmap-1.6.2/src/map.rs:76:12 | 76 | pub struct IndexMap<K, V, S> { | ^^^^^^^^ - - - help: add missing type argument | 77 | pub(crate) args: IndexMap<Id, MatchedArg, S>, | ^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0107`. error: could not compile `clap` To learn more, run the command again with --verbose. Expected Behaviour Compiles successfully when added as a dependency Additional Context I recently completely reinstalled wsl with ubuntu 20.04 and I have nothing but the rust toolchain installed on top of the default installation and anything required to compile rust projects. I can compile other projects that do not use clap. Yes, I ran an apt update and apt upgrade. I tried building a project using clap and saw this output. I then reproduced the bug by adding the dependency to an empty project and I saw the same output of clap not being able to compile. I know this works correctly in my windows install, but I also compiled that project yesterday in a ubuntu 18.04 not through wsl and it worked. I'm not sure if the issue is with WSL or ubuntu 20.04 Debug Output *No response* — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2535>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABKU345KHMNXMNE6ZLAJWDTSTTSLANCNFSM46T522JQ> .

[pksunkara]

Looks like it's an issue with rust and WSL and ubuntu. There's a workaround at indexmap-rs/indexmap#144 (comment).

[IceSentry]

I found another workaround, you can add
indexmap = { version = "1.6.1", features = ["std"] } to Cargo.toml to force indexmap to use the std version. Apparently this happens because wsl breaks the std detection