Incorrect Rust region coverage? about cargo-llvm-cov HOT 6 OPEN

The else arm of the if expression gets its own region, even if there is no else in the source file.

In your example program the else arm isn't executed and has an execution count of 0.

In the C++ program, this fact is represented by the Branch Coverage column instead. (Rust currently doesn't support LLVM branch coverage mappings.)

from cargo-llvm-cov.

Are you referring to the fact that the uncovered else block isn’t highlighted on line 4?

Yes.

I'm not 100% certain that this should be considered a bug, but in any case, since this is a discussion about the behavior of rustc and not cargo-llvm-cov, it is better to discuss it in the rust-lang/rust and not in this repository.

from cargo-llvm-cov.

The else arm of the if expression gets its own region, even if there is no else in the source file.

Why in C++, the else branch does not get its own region even though it does in Rust?

from cargo-llvm-cov.

In Rust with branch coverage enabled (--branch, #8):

from cargo-llvm-cov.

I believe this is an issue on the rustc rather than the cargo-llvm-cov.

Would you mind submitting an issue at https://github.com/rust-lang/rust?

from cargo-llvm-cov.

I’m not quite sure what the bug here is supposed to be.

Are you referring to the fact that the uncovered else block isn’t highlighted on line 4?

from cargo-llvm-cov.