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: _listing_revision_input.rs
    path of file: ./repos/aws-sdk-rust/sdk/datazone/src/types
    
    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>A revision to be made to an asset published in 
    
    pub fn build(self) -> ::std::result::Result<crate::types::ListingRevisionInput, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::ListingRevisionInput {
            identifier: self.identifier.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "identifier",
                    "identifier was not specified but it is required when building ListingRevisionInput",
                )
            })?,
            revision: self.revision.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "revision",
                    "revision was not specified but it is required when building ListingRevisionInput",
                )
            })?,
        })
    }