many-seeds: in keep-going mode, print how many tests failed

Author: RalfJung

src/tools/miri/src/bin/miri.rs

@@ -30,7 +30,7 @@ use std::ops::Range;
 use std::path::PathBuf;
 use std::str::FromStr;
 use std::sync::Once;
-use std::sync::atomic::{AtomicI32, Ordering};
+use std::sync::atomic::{AtomicI32, AtomicU32, Ordering};
 
 use miri::{
     BacktraceStyle, BorrowTrackerMethod, MiriConfig, MiriEntryFnType, ProvenanceMode, RetagFields,
@@ -183,7 +183,8 @@ impl rustc_driver::Callbacks for MiriCompilerCalls {
         if let Some(many_seeds) = self.many_seeds.take() {
             assert!(config.seed.is_none());
             let exit_code = sync::IntoDynSyncSend(AtomicI32::new(rustc_driver::EXIT_SUCCESS));
-            sync::par_for_each_in(many_seeds.seeds, |seed| {
+            let num_failed = sync::IntoDynSyncSend(AtomicU32::new(0));
+            sync::par_for_each_in(many_seeds.seeds.clone(), |seed| {
                 let mut config = config.clone();
                 config.seed = Some(seed.into());
                 eprintln!("Trying seed: {seed}");
@@ -197,8 +198,13 @@ impl rustc_driver::Callbacks for MiriCompilerCalls {
                         std::process::exit(return_code);
                     }
                     exit_code.store(return_code, Ordering::Relaxed);
+                    num_failed.fetch_add(1, Ordering::Relaxed);
                 }
             });
+            let num_failed = num_failed.0.into_inner();
+            if num_failed > 0 {
+                eprintln!("{num_failed}/{total} SEEDS FAILED", total = many_seeds.seeds.count());
+            }
             std::process::exit(exit_code.0.into_inner());
         } else {
             let return_code = miri::eval_entry(tcx, entry_def_id, entry_type, config)