You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: count_property_use.rs
    path of file: ./repos/slint/internal/compiler/llr/optim_passes
    
    the code of the file until where you have to start completion: // Copyright Â© SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Ide
    
fn visit_expression(expr: &Expression, ctx: &EvaluationContext) {
    let p = match expr {
        Expression::PropertyReference(p) => p,
        Expression::CallBackCall { callback, .. } => callback,
        Expression::PropertyAssignment { property, .. } => {
            if let Some((a, map)) = &ctx.property_info(property).animation {
                let ctx2 = map.map_context(ctx);
                a.visit_recursive(&mut |e| visit_expression(e, &ctx2))
            }
            property
        }
        // FIXME  (should be fine anyway because we mark these as not optimizable)
        Expression::ModelDataAssignment { .. } => return,
        Expression::LayoutCacheAccess { layout_cache_prop, .. } => layout_cache_prop,
        _ => return,
    };
    visit_property(p, ctx)
}