intellij-rust: Syntax highlighting/code completion not working for (some) tokio modules

Environment

• IntelliJ Rust plugin version: 0.2.110.2150-193 (also tried 192)
• Rust toolchain version: 1.39.0
• IDE name and version: Clion 2019.3, also tested 2019.2.5
• Operating system: Windows 10 Version 1909, also tested MacOS 10.14.6

Problem description

This problem is possibly very similar to #4627 but with tokio instead of async_std…something to do with macro resolution probably. The main reason I’m posting this is because I’ve found a (rather obvious) very fragile unsafe workaround to mitigate the pain of not having proper code analysis (in CLion) temporarily.

The issue is described best by some code:

use tokio::net::TcpStream; // 
              //  ^^^^^^ Lack of color here, can't Cmd/Ctrl-B here.

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
  let tcp = TcpStream::connect("420.4.2.0:4204").await?;
         // ^^^^^^^^^^^^^^^^^^ Unresolved reference: `TcpStream`

Steps to reproduce

In Cargo.toml, add:

[dependencies.tokio]
version = "0.2.2"
features = [ "full" ]

(I added “full” to enable all possible features, just to make sure the issue isn’t caused by a feature not being enabled)

Steps to hack around

What we do here is basically trade a real eye for 2 fake ones:

From tokio-0.2.2/src/net/mod.rs, note lines 28-32:

cfg_tcp! {  
    pub mod tcp;  
    pub use tcp::listener::TcpListener;  
    pub use tcp::stream::TcpStream;  
}

Well, cfg_tcp! causes the issue…so I deemed it necessary to hardcode:

// cfg_tcp! {  
    pub mod tcp;  
    pub use tcp::listener::TcpListener;  
    pub use tcp::stream::TcpStream;  
// }

Maybe the plugin could do something like this behind the scenes as a temporary hack to get things working; just throwing out ideas because I’ve heard that this issue has been around for quite awhile.