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: edits.rs
    path of file: ./repos/ruff/crates/ruff_linter/src/fix
    
    the code of the file until where you have to start completion: //! Interface for generating fix edits from higher-level actions (e.g., "remove an argument").

use anyhow::{Context, Result};

use ruff_diagnostics::Edit;
use ruff_python_ast::parenthesize::parenthesized_range;
use ruff_python_ast::{self as ast, Arguments, 
    
pub(crate) fn pad_start(mut content: String, start: TextSize, locator: &Locator) -> String {
    // Ex) When converting `except(ValueError,)` from a tuple to a single argument, we need to
    // insert a space before the fix, to achieve `except ValueError`.
    if locator
        .up_to(start)
        .chars()
        .last()
        .is_some_and(|char| char.is_ascii_alphabetic())
    {
        content.insert(0, ' ');
    }
    content
}