From 9478fac97984cf8291bf89c55eb9a02a06889e03 Mon Sep 17 00:00:00 2001
From: David Pedersen <david.pdrsn@gmail.com>
Date: Thu, 27 May 2021 15:47:42 +0200
Subject: [PATCH] fix(build): fix `with_interceptor` not building on Rust 1.51
 (#669)

Fixes https://github.com/hyperium/tonic/issues/666
---
 tonic-build/src/client.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tonic-build/src/client.rs b/tonic-build/src/client.rs
index 67b4792c5..be7d4247b 100644
--- a/tonic-build/src/client.rs
+++ b/tonic-build/src/client.rs
@@ -50,7 +50,10 @@ pub fn generate<T: Service>(
                 pub fn with_interceptor<F>(inner: T, interceptor: F) -> #service_ident<InterceptedService<T, F>>
                 where
                     F: FnMut(tonic::Request<()>) -> Result<tonic::Request<()>, tonic::Status>,
-                    T: Service<http::Request<tonic::body::BoxBody>, Response = http::Response<T::ResponseBody>>,
+                    T: Service<
+                        http::Request<tonic::body::BoxBody>,
+                        Response = http::Response<<T as tonic::client::GrpcService<tonic::body::BoxBody>>::ResponseBody>
+                    >,
                     <T as Service<http::Request<tonic::body::BoxBody>>>::Error: Into<StdError> + Send + Sync,
                 {
                     #service_ident::new(InterceptedService::new(inner, interceptor))