Don't call closures immediately, use try{} blocks

compiler/rustc_interface/src/lib.rs

@@ -3,6 +3,7 @@
 #![feature(internal_output_capture)]
 #![feature(thread_spawn_unchecked)]
 #![feature(once_cell)]
+#![feature(try_blocks)]
 #![recursion_limit = "256"]
 #![allow(rustc::potential_query_instability)]
 #![deny(rustc::untranslatable_diagnostic)]

compiler/rustc_interface/src/passes.rs

@@ -559,7 +559,7 @@ fn write_out_deps(
     }
     let deps_filename = outputs.path(OutputType::DepInfo);
 
-    let result = (|| -> io::Result<()> {
+    let result: io::Result<()> = try {
         // Build a list of files used to compile the output and
         // write Makefile-compatible dependency rules
         let mut files: Vec<String> = sess
@@ -646,9 +646,7 @@ fn write_out_deps(
                 writeln!(file)?;
             }
         }
-
-        Ok(())
-    })();
+    };
 
     match result {
         Ok(_) => {