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: column.rs
    path of file: ./repos/erdtree/src/context
    
    the code of the file until where you have to start completion: use super::{Context, PrefixKind};
use std::convert::From;

/// Utility struct to help store maximum column widths for attributes of each node. Each width is
/// measured as
    
    fn from(ctx: &Context) -> Self {
        let unit_width = match ctx.unit {
            PrefixKind::Bin if ctx.human => 3,
            PrefixKind::Si if ctx.human => 2,
            _ => 1,
        };

        Self {
            max_size_unit_width: unit_width,
            ..Default::default()
        }
    }