[ruby/mmtk] Fix warnings from cargo fmt

ruby/mmtk@84975a8840

Author: peterzhu2118

gc/mmtk/src/api.rs

@@ -107,9 +107,7 @@ pub extern "C" fn mmtk_builder_default() -> *mut MMTKBuilder {
     if let Some(threads) = mmtk_builder_default_parse_threads() {
         if !builder.options.threads.set(threads) {
             // MMTk will validate it and reject 0.
-            eprintln!(
-                "[FATAL] Failed to set the number of MMTk threads to {threads}"
-            );
+            eprintln!("[FATAL] Failed to set the number of MMTk threads to {threads}");
             std::process::exit(1);
         }
     }
@@ -119,9 +117,7 @@ pub extern "C" fn mmtk_builder_default() -> *mut MMTKBuilder {
     let heap_max = mmtk_builder_default_parse_heap_max();
 
     if heap_min >= heap_max {
-        eprintln!(
-            "[FATAL] MMTK_HEAP_MIN({heap_min}) >= MMTK_HEAP_MAX({heap_max})"
-        );
+        eprintln!("[FATAL] MMTK_HEAP_MIN({heap_min}) >= MMTK_HEAP_MAX({heap_max})");
         std::process::exit(1);
     }
 

gc/mmtk/src/collection.rs

@@ -41,9 +41,7 @@ impl Collection<Ruby> for VMCollection {
                 .name("MMTk Worker Thread".to_string())
                 .spawn(move || {
                     let ordinal = worker.ordinal;
-                    debug!(
-                        "Hello! This is MMTk Worker Thread running! ordinal: {ordinal}"
-                    );
+                    debug!("Hello! This is MMTk Worker Thread running! ordinal: {ordinal}");
                     crate::register_gc_thread(thread::current().id());
                     let ptr_worker = &mut *worker as *mut GCWorker<Ruby>;
                     let gc_thread_tls =
@@ -54,9 +52,7 @@ impl Collection<Ruby> for VMCollection {
                         GCThreadTLS::to_vwt(gc_thread_tls),
                         worker,
                     );
-                    debug!(
-                        "An MMTk Worker Thread is quitting. Good bye! ordinal: {ordinal}"
-                    );
+                    debug!("An MMTk Worker Thread is quitting. Good bye! ordinal: {ordinal}");
                     crate::unregister_gc_thread(thread::current().id());
                 })
                 .unwrap(),

gc/mmtk/src/scanning.rs

@@ -47,9 +47,7 @@ impl Scanning<Ruby> for VMScanning {
             );
             let forwarded_target = object_tracer.trace_object(target_object);
             if forwarded_target != target_object {
-                trace!(
-                    "  Forwarded target {target_object} -> {forwarded_target}"
-                );
+                trace!("  Forwarded target {target_object} -> {forwarded_target}");
             }
             forwarded_target
         };
@@ -249,9 +247,7 @@ impl<F: RootsWorkFactory<RubySlot>> GCWork<Ruby> for ScanWbUnprotectedRoots<F> {
         VMScanning::collect_object_roots_in("wb_unprot_roots", gc_tls, &mut self.factory, || {
             for object in self.objects.iter().copied() {
                 if object.is_reachable() {
-                    debug!(
-                        "[wb_unprot_roots] Visiting WB-unprotected object (parent): {object}"
-                    );
+                    debug!("[wb_unprot_roots] Visiting WB-unprotected object (parent): {object}");
                     (upcalls().scan_object_ruby_style)(object);
                 } else {
                     debug!(

gc/mmtk/src/weak_proc.rs

@@ -112,9 +112,7 @@ impl GCWork<Ruby> for ProcessObjFreeCandidates {
             if object.is_reachable() {
                 // Forward and add back to the candidate list.
                 let new_object = object.forward();
-                trace!(
-                    "Forwarding obj_free candidate: {object} -> {new_object}"
-                );
+                trace!("Forwarding obj_free candidate: {object} -> {new_object}");
                 new_candidates.push(new_object);
             } else {
                 (upcalls().call_obj_free)(object);
@@ -213,9 +211,7 @@ impl GCWork<Ruby> for UpdateWbUnprotectedObjectsList {
             if object.is_reachable() {
                 // Forward and add back to the candidate list.
                 let new_object = object.forward();
-                trace!(
-                    "Forwarding WB-unprotected object: {object} -> {new_object}"
-                );
+                trace!("Forwarding WB-unprotected object: {object} -> {new_object}");
                 objects.insert(new_object);
             } else {
                 trace!("Removing WB-unprotected object from list: {object}");