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: _headers.rs
    path of file: ./repos/aws-sdk-rust/sdk/wafv2/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>Inspect all headers in the web request. You can specify the parts of the headers to inspect and you can narrow the set of headers to inspec
    
    pub fn build(self) -> ::std::result::Result<crate::types::Headers, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::Headers {
            match_pattern: self.match_pattern,
            match_scope: self.match_scope.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "match_scope",
                    "match_scope was not specified but it is required when building Headers",
                )
            })?,
            oversize_handling: self.oversize_handling.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "oversize_handling",
                    "oversize_handling was not specified but it is required when building Headers",
                )
            })?,
        })
    }