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: _attribute.rs
    path of file: ./repos/aws-sdk-rust/sdk/iotevents/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>The attributes from the JSON payload that are made available by the input. Inputs are derived from messages sent to the AWS IoT Events system using <code>BatchPutMessage</code>. Each such message contains a JSON payload. Those attributes (and their paired values) 
    
    pub fn build(self) -> ::std::result::Result<crate::types::Attribute, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::Attribute {
            json_path: self.json_path.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "json_path",
                    "json_path was not specified but it is required when building Attribute",
                )
            })?,
        })
    }