Intellij-rust: Debugging unit test in lib does not seem to work

[ralfbiedert]

Environment

• Intellij-Rust plugin version: 0.2.96.2122-191
• Rust toolchain version: 1.35.0-nightly (2a65cbeea 2019-03-08)
• IDE name and version: CLion 2019.01
• Operating system: macOS 10.14.4

Problem description

When I try to debug unit tests in a library project, CLion never seems to honor or stop at my break points. It seems unit tests run in debug mode behave as if run in default "run" mode.

Steps to reproduce

Cargo.toml:

[package]
name = "breakpoints"
version = "0.1.0"
edition = "2018"

[[bin]]
name = "my_bin"
path = "src/main.rs"

[lib]
name = "my_lib"
path = "src/lib.rs"

src/main.rs:

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

#[test]
fn test() {
    println!("Hello debug bin"); // a breakpoint here halts
}

src/lib.rs:

#[test]
fn test() {
    println!("Hello debug lib"); // a breakpoint here doesn't halt
}

Setting a breakpoint in main::test and running the debugger works.

Setting a breakpoint in lib::test and running the debugger simply ignores the breakpoint and executes the test as if running in regular mode.

(Image above is taken from actual library project, effect is the same: when I click "Debug Test ...", I just get the output as depicted on the debug console (1 of 1 test passed), but the breakpoint was never hit.)

[mchernyavsky]

I think these are issues with the compiler in rust-lang/rust. I have managed to reproduce this bug without IntelliJ: https://github.com/rust-lang/rust/issues/59907

[jiegec]

This should be fixed by https://github.com/rust-lang/cargo/pull/7965

[Fohlen]

This fix is shipped in cargo v1.44.0 which as of now can be obtained using the nightly toolchain.

rustup toolchain install nightly
rustup default nightly

I installed the nightly version and it did indeed fix these issues for me.

As these changes move to the beta and stable branches this issue can probably be closed.