pub fn ser_list_subscriptions_by_topic_input_input(
input: &crate::operation::list_subscriptions_by_topic::ListSubscriptionsByTopicInput,
) -> Result<::aws_smithy_http::body::SdkBody, ::aws_smithy_http::operation::error::SerializationError> {
let mut out = String::new();
#[allow(unused_mut)]
let mut writer = ::aws_smithy_query::QueryWriter::new(&mut out, "ListSubscriptionsByTopic", "2010-03-31");
#[allow(unused_mut)]
let mut scope_1 = writer.prefix("TopicArn");
if let Some(var_2) = &input.topic_arn {
scope_1.string(var_2);
}
#[allow(unused_mut)]
let mut scope_3 = writer.prefix("NextToken");
if let Some(var_4) = &input.next_token {
scope_3.string(var_4);
}
writer.finish();
Ok(::aws_smithy_http::body::SdkBody::from(out))
}