Next step in result assessment would be a few less trivial examples and comparing how file sizes go up between languages: is the bulk of the observed "Rust tax"

Next step in result assessment would be a few less trivial examples and comparing how file sizes go up between languages: is the bulk of the observed "Rust tax" a one-time investment that won't grow for less trivial code or will the size keep growing in almost linear way, keeping the file size ratios roughly the same?