doesn't understand where bins live

[NovaDenizen]

 $ find src -type f
src/lib.rs
src/bin/prof_bin.rs
 $ cat src/lib.rs

pub fn libfunc() {
    println!("This is a library function");
}
 $ cat src/bin/prof_bin.rs

use cargo_profiler_example::*;

fn main() {
    libfunc();
}
 $ cargo run --bin prof_bin
   Compiling cargo-profiler-example v0.1.0 (/home/novadenizen/prog/cargo-profiler-example)
    Finished dev [unoptimized + debuginfo] target(s) in 0.30s
     Running `target/debug/prof_bin`
This is a library function
 $ cargo profiler cachegrind --bin prof_bin
error: Invalid binary. make sure binary exists.

I did an strace of the cargo profiler command, and found that the current directory is unchanged from the project directory, and it's trying to open the prof_bin binary in the current directory.

I created an empty prof_bin file in the project directory and you can see the error changes.

 $ touch prof_bin
 $ cargo profiler cachegrind --bin prof_bin

Profiling prof_bin with cachegrind...
error: Misaligned data arrays due to regex error -- please file a bug.
 $