My code needs two passes to be formatted correctly

When making the following change from https://github.com/msrd0/gotham_restful/tree/5181b4b448003a06e01d50609371a9578db9d067, rustfmt _{^{(rustfmt 1.4.38-nightly (5e57faa 2022-01-19))}} needs two passes to correctly format the code:

My Change:

$ git diff src/openapi/router.rs |cat
diff --git a/src/openapi/router.rs b/src/openapi/router.rs
index dbcecb8a5..ec5fdcc21 100644
--- a/src/openapi/router.rs
+++ b/src/openapi/router.rs
@@ -137,8 +137,7 @@ macro_rules! implOpenapiRouter {
 					Method::PATCH => item.patch = Some(op),
 					Method::TRACE => item.trace = Some(op),
 					method => warn!(
-						"Ignoring unsupported method '{}' in OpenAPI Specification",
-						method
+						"Ignoring unsupported method '{method}' in OpenAPI Specification"
 					)
 				};
 				(self.0).openapi_builder.add_path(path, item);

First Pass of rustfmt:

$ git diff src/openapi/router.rs |cat
diff --git a/src/openapi/router.rs b/src/openapi/router.rs
index dbcecb8a5..e81e0640f 100644
--- a/src/openapi/router.rs
+++ b/src/openapi/router.rs
@@ -136,10 +136,9 @@ macro_rules! implOpenapiRouter {
 					Method::HEAD => item.head = Some(op),
 					Method::PATCH => item.patch = Some(op),
 					Method::TRACE => item.trace = Some(op),
-					method => warn!(
-						"Ignoring unsupported method '{}' in OpenAPI Specification",
-						method
-					)
+					method => {
+						warn!("Ignoring unsupported method '{method}' in OpenAPI Specification")
+					},
 				};
 				(self.0).openapi_builder.add_path(path, item);
 

Second Pass of rustfmt:

$ git diff src/openapi/router.rs |cat
diff --git a/src/openapi/router.rs b/src/openapi/router.rs
index dbcecb8a5..33937d612 100644
--- a/src/openapi/router.rs
+++ b/src/openapi/router.rs
@@ -136,10 +136,9 @@ macro_rules! implOpenapiRouter {
 					Method::HEAD => item.head = Some(op),
 					Method::PATCH => item.patch = Some(op),
 					Method::TRACE => item.trace = Some(op),
-					method => warn!(
-						"Ignoring unsupported method '{}' in OpenAPI Specification",
-						method
-					)
+					method => {
+						warn!("Ignoring unsupported method '{method}' in OpenAPI Specification")
+					}
 				};
 				(self.0).openapi_builder.add_path(path, item);
 

Notice the }, was changed to } in the second pass.

Start with the reproduction in src/openapi/router.rs and run rustfmt 1.4.38-nightly on the shown change. Compare the first and second formatting passes, focusing on the macro arm where the unsupported-method warning changes from }, to }. Done means one rustfmt pass produces stable output for this case.