Autogenerated struct does not implement Sized?

[alexhooketh]

Hey y'all! I'm new to Tonic, and I can't figure out one thing that doesn't seem to be documented anywhere.

async fn get_block_by_number(
    client: &mut WalletClient<Channel>,
    block_number: u32,
) -> Result<Vec<Vec<u8>>, Box<dyn std::error::Error>> {
    let request = Request::new(NumberMessage {
        num: block_number as i64,
    });

    let response: Response<BlockExtention> = client.get_block_by_num2(request).await?;
    let block: BlockExtention = response.into_inner(); // this doesn't compile

    ...
}

According to the compiler, BlockExtention must implement std::marker::Sized to do .into_inner(), .get_ref(), etc, on it. However, it's automatically generated using tonic-build, and I have no idea how to implement it myself.

Necessary protos:

...
message NumberMessage {
  int64 num = 1;
}
...
message BlockExtention {
  repeated TransactionExtention transactions = 1;
  BlockHeader block_header = 2;
  bytes blockid = 3;
}
...
rpc GetBlockByNum2 (NumberMessage) returns (BlockExtention) {
  }
...

Tonic-build's codegen (found in /target):

...
#[allow(clippy::derive_partial_eq_without_eq)]
#[derive(Clone, Copy, PartialEq, ::prost::Message)]
pub struct NumberMessage {
    #[prost(int64, tag = "1")]
    pub num: i64,
}
...
#[allow(clippy::derive_partial_eq_without_eq)]
#[derive(Clone, PartialEq, ::prost::Message)]
pub struct BlockExtention {
    #[prost(message, repeated, tag = "1")]
    pub transactions: ::prost::alloc::vec::Vec<TransactionExtention>,
    #[prost(message, optional, tag = "2")]
    pub block_header: ::core::option::Option<BlockHeader>,
    #[prost(bytes = "vec", tag = "3")]
    pub blockid: ::prost::alloc::vec::Vec<u8>,
}
...
pub async fn get_block_by_num2(
            &mut self,
            request: impl tonic::IntoRequest<super::NumberMessage>,
        ) -> std::result::Result<tonic::Response<super::BlockExtention>, tonic::Status> {
...

Would appreciate any help!

[alexhooketh]

I figured it out. I had to add prost crate and use prost::Message; to my codefile. Even though it shows a warning for an unused import, it works for some reason. I'll leave this public for people with this problem.