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: button_icon.rs
    path of file: ./repos/zed/crates/ui/src/components/button
    
    the code of the file until where you have to start completion: use crate::{prelude::*, Icon, IconName, IconSize};

/// An icon that appears within a button.
///
/// Can be used
    
    pub fn size(mut self, size: impl Into<Option<IconSize>>) -> Self {
        if let Some(size) = size.into() {
            self.size = size;
        }

        self
    }