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: tracing_timer.rs
    path of file: ./repos/matrix-rust-sdk/crates/matrix-sdk-common/src
    
    the code of the file until where you have to start completion: // Copyright 2023 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS"
    
    fn drop(&mut self) {
        let message = format!("{} finished in {}ms", self.id, self.start.elapsed().as_millis());

        let enabled = tracing::level_enabled!(self.level) && {
            let interest = self.callsite.interest();
            !interest.is_never()
                && tracing::__macro_support::__is_enabled(self.callsite.metadata(), interest)
        };

        if !enabled {
            return;
        }

        let metadata = self.callsite.metadata();
        let fields = metadata.fields();
        let message_field = fields.field("message").unwrap();
        #[allow(trivial_casts)] // The compiler is lying, it can't infer this cast
        let values = [(&message_field, Some(&message as &dyn tracing::Value))];

        // This function is hidden from docs, but we have to use it
        // because there is no other way of obtaining a `ValueSet`.
        // It's not entirely clear why it is private. See this issue:
        // https://github.com/tokio-rs/tracing/issues/2363
        let values = fields.value_set(&values);

        tracing::Event::dispatch(metadata, &values);
    }