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: _duplicate_document_version_name.rs
    path of file: ./repos/aws-sdk-rust/sdk/ssm/src/types/error
    
    the code of the file until where you have to start completion: // Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.

/// <p>The version name has already been used in this document. Specify a different version name, and then try again.</p>
#[non_exhaus
    
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        ::std::write!(f, "DuplicateDocumentVersionName")?;
        if let ::std::option::Option::Some(inner_1) = &self.message {
            {
                ::std::write!(f, ": {}", inner_1)?;
            }
        }
        Ok(())
    }