Spurious failure to load a `.rs` file from `OUT_DIR`

FWIW I'm seeing this in a multi-crate repository (tagged to a commit that exhibits the issue). It appears that RA may be trying to use the wrong path relative to the crate to load the included file? The project(s) build fine with cargo, so the error is simply wrong.

The path in the error message is (relative to repository root):
libretro-rs/target/debug/build/libretro-rs-sys-37adac34f8f4cbf3/out/libretro.rs

But the path I would expect is:
libretro-rs-sys/target/debug/build/libretro-rs-sys-86130f2702103941/out/libretro.rs

However, the path in the error message does exist, since the libretro-rs crate depends on the libretro-rs-sys crate in the same repository. It appears that RA is getting confused and I don't think the solution should involve adding configuration to straighten it out. If cargo can figure it out then RA should be able to as well.

$ cargo build
   Compiling libretro-rs-sys v0.1.0 (/home/adam/Repos/libretro-rs/libretro-rs-sys)
   Compiling libretro-rs v0.1.3 (/home/adam/Repos/libretro-rs/libretro-rs)
   Compiling example v0.1.0 (/home/adam/Repos/libretro-rs/example)
    Finished dev [unoptimized + debuginfo] target(s) in 0.93s

If this issue is unrelated, I'll make a new issue.

Originally posted by @adam-becker in https://github.com/rust-lang/rust-analyzer/issues/10178#issuecomment-1107666673

Reproduce the issue in the linked multi-crate libretro-rs repository and compare rust-analyzer's reported OUT_DIR path with the path produced by cargo build. Trace how the libretro-rs and libretro-rs-sys crates are resolved, then verify that rust-analyzer loads the generated libretro.rs from the expected crate-specific target directory.