diff --git a/compiler/rustc_driver/src/lib.rs b/compiler/rustc_driver/src/lib.rs
index 3f50c68e3eb..e89fcc920a0 100644
--- a/compiler/rustc_driver/src/lib.rs
+++ b/compiler/rustc_driver/src/lib.rs
@@ -155,8 +155,7 @@ pub fn run_compiler(
             ),
         }
     }
-    let diagnostic_output =
-        emitter.map(|emitter| DiagnosticOutput::Raw(emitter)).unwrap_or(DiagnosticOutput::Default);
+    let diagnostic_output = emitter.map(DiagnosticOutput::Raw).unwrap_or(DiagnosticOutput::Default);
     let matches = match handle_options(&args) {
         Some(matches) => matches,
         None => return Ok(()),