MSVC C Integer constants are not supported

Input C/C++ Header

#define POOL_FLAG_REQUIRED_START          0x0000000000000001UI64

Bindgen Invocation

            builder
            .use_core()
            .derive_default(true)
            .detect_include_paths(false)
            .default_enum_style(bindgen::EnumVariation::ModuleConsts)
            .parse_callbacks(Box::new(bindgen::CargoCallbacks))
            .with_codegen_config(CodegenConfig::VARS)
            .generate()
            .expect("Bindings should succeed to generate")
            .write_to_file(out_path.join("constants.rs"))?

Actual Results

generates empty file

Expected Results

pub const POOL_FLAG_REQUIRED_START: u32 = 1;

It seems like the core issue here is that bindgen does not support msvc's integer constants. Removing the UI64 suffix causes the correct generation. Unfortunately, I do not control the headers I am generating bindings too, so cannot just edit the header to use more standard integer literal declarations.

Reproduce the case with the shown C++ header and bindgen::Builder configuration, focusing on CodegenConfig::VARS and the generate entry point. Done means generation succeeds and constants.rs contains POOL_FLAG_REQUIRED_START with value 1 and type u32 for the MSVC UI64 suffix.