rust-bindgen: rustfmt_bindings(true) doesn't format the output file

Input C/C++ Header

https://github.com/chaoticbob/SPIRV-Reflect/blob/master/spirv_reflect.h

Bindgen Invocation

    let bindings = bindgen::Builder::default()
        .header("spirv_reflect.h")
        .rustfmt_bindings(true)
        .layout_tests(false)
        .generate()
        .expect("Unable to generate bindings!");

    bindings
        .write_to_file(std::path::Path::new(output.rs))
        .expect("Unable to write bindings!");

Actual Results

It doesn’t make any difference if I use this with .rustfmt_bindings(true) or .rustfmt_bindings(false) for the constants defined at the top of the file. They are all on one line. I am on the 0.43.1 version.

Expected Results

I would have expected the file to look like it does after I run rustfmt on it (in vscode with rls), with every constant on a new line.