Generated mod via build.rs not properly picked up

[abergmeier]

rust-analyzer version: (eg. output of "rust-analyzer: Show RA Version" command, accessible in VSCode via Ctrl/⌘+Shift+P)
rust-analyzer version: 0.3.2353-standalone (37acea8 2025-03-23) [/home/andreas/.vscode/extensions/rust-lang.rust-analyzer-0.3.2353-linux-x64/server/rust-analyzer]

rustc version: (eg. output of rustc -V)
rustc 1.85.1 (4eb161250 2025-03-15)

editor or extension: (eg. VSCode, Vim, Emacs, etc. For VSCode users, specify your extension version; for users of other editors, provide the distribution if applicable)
VSC 0.3.2353

The build.rs generates a mod with consts.
In the screenshot the interesting thing is that the const is evaluated correctly. In the editor though, the mod is marked as unknown.

code snippet to reproduce:

use std::{
    env,
    fs,
    io::Write,
    path::Path,
};

use mixlib::MixFilename;

fn main() {
    println!("cargo::rerun-if-changed=td.csv");
    println!("cargo::rerun-if-changed=build.rs");

    let mut reader = csv::ReaderBuilder::new().delimiter(b' ').from_path("td.csv").unwrap();
    let iter = reader.records();
    let out_dir = env::var_os("OUT_DIR").unwrap();
    let dest_path = Path::new(&out_dir).join("crcs.rs");
    let mut w = fs::File::create(&dest_path).unwrap();
    writeln!(&mut w, "pub mod known_files {{").unwrap();
    writeln!(&mut w, "  use mixlib::MixFilename;").unwrap();

    for result in iter {
        let result = result.unwrap();
        let crc: u32 = result.get(0).unwrap().parse().unwrap();
        let filename = result.get(1).unwrap();
        let mf = MixFilename::new(filename);
        if mf.crc != crc {
            panic!("CRC value for {filename} seems to diverge: {crc} <-> {}", mf.crc);
        }
        let symbol = filename.replace(".", "_");
        writeln!(
            &mut w,
            "  pub const {symbol}: MixFilename = MixFilename::new(\"{filename}\");"
        )
        .unwrap();
    }
    writeln!(&mut w, "}}").unwrap();
}