Code coverage not working

Environment

• IntelliJ Rust plugin version: 0.2.115.2157-193
• Rust toolchain version: rustc 1.41.0-nightly (710a362dc 2019-12-05)
• IDE name and version: CLion 2019.3.4
• Operating system: Linux Arch
• gcov: gcov (Arch Linux 9.2.1+20200130-2) 9.2.1 20200130
• lcov: LCOV version 1.14-6-g40580cd
• grcov: grcov 0.5.5

Problem description

Code coverage does not work

Steps to reproduce

Create a project with two files:

Cargo.toml

[package]
name = "rust-coverage-clion"
version = "0.1.0"
edition = "2018"

[dependencies]

lib.rs

fn sum(a: u32, b: u32) -> u32 {
    dbg!((a, b));
    a + b
}


#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn it_works() {
        assert_eq!(sum(2, 2), 4);
    }
}

Add a run configuration “test” of type “Cargo command”, where command is “test”

Click on “Run ‘test’ with coverage”

CLion successfully build the project and launches test. Test results are visible (one test, it succeeds) and dbg! output is shown as expected.

Code Coverage is not highlighted in the gutter.

Clicking “Run -> Show code coverage data” shows a window with a message “no coverage suites configured”

[mleonhard]

The fix was to update grcov:

$ cargo install --force grcov
...
Replaced package `grcov v0.5.15` with `grcov v0.7.1` (executable `grcov`)

[mleonhard]

Code coverage is not working for me with Rust plugin 0.3.143.3737-203 in CLion 2020.3.3. My project uses a cargo workspace. When I click the Coverage button, the tests run but the coverage screen does not appear.

I made these changes to the Run Configuration:

• Command: test --package package1
• Working directory: the workspace directory, not the package directory

Now the coverage screen appears, but all files show 0 lines covered.

I filed an issue with JetBrains: https://youtrack.jetbrains.com/issue/CPP-24459