Miri subtree update

src/tools/miri/README.md

@@ -223,9 +223,10 @@ degree documented below):
 - All Rust [Tier 1 targets](https://doc.rust-lang.org/rustc/platform-support.html) are supported by
   Miri. They are all checked on Miri's CI, and some (at least one per OS) are even checked on every
   Rust PR, so the shipped Miri should always work on these targets.
-- We also support `s390x-unknown-linux-gnu` as our "big-endian target of choice".
+- `aarch64-apple-darwin` is supported.
+- `s390x-unknown-linux-gnu` is supported as our "big-endian target of choice".
 - For every other target with OS `linux`, `macos`, or `windows`, Miri should generally work, but we
-  make no promises.
+  make no promises and we don't run tests for such targets.
 - For targets on other operating systems, even basic operations such as printing to the standard
   output might not work, and Miri might fail before even reaching the `main` function.
 

src/tools/miri/rust-version

@@ -1 +1 @@
-2e4e2a8f288f642cafcc41fff211955ceddc453d
+3aaa0f57b7b877ef58532a8de075d1e5a79142bf

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

@@ -241,7 +241,7 @@ fn run_compiler(
     mut args: Vec<String>,
     target_crate: bool,
     callbacks: &mut (dyn rustc_driver::Callbacks + Send),
-    using_internal_features: std::sync::Arc<std::sync::atomic::AtomicBool>
+    using_internal_features: std::sync::Arc<std::sync::atomic::AtomicBool>,
 ) -> ! {
     if target_crate {
         // Miri needs a custom sysroot for target crates.
@@ -275,7 +275,8 @@ fn run_compiler(
     // Invoke compiler, and handle return code.
     let exit_code = rustc_driver::catch_with_exit_code(move || {
         rustc_driver::RunCompiler::new(&args, callbacks)
-            .set_using_internal_features(using_internal_features).run()
+            .set_using_internal_features(using_internal_features)
+            .run()
     });
     std::process::exit(exit_code)
 }
@@ -297,7 +298,8 @@ fn main() {
     // If the environment asks us to actually be rustc, then do that.
     if let Some(crate_kind) = env::var_os("MIRI_BE_RUSTC") {
         // Earliest rustc setup.
-        let using_internal_features = rustc_driver::install_ice_hook(rustc_driver::DEFAULT_BUG_REPORT_URL, |_| ());
+        let using_internal_features =
+            rustc_driver::install_ice_hook(rustc_driver::DEFAULT_BUG_REPORT_URL, |_| ());
         rustc_driver::init_rustc_env_logger(&handler);
 
         let target_crate = if crate_kind == "target" {
@@ -318,7 +320,8 @@ fn main() {
     }
 
     // Add an ICE bug report hook.
-    let using_internal_features = rustc_driver::install_ice_hook("https://github.com/rust-lang/miri/issues/new", |_| ());
+    let using_internal_features =
+        rustc_driver::install_ice_hook("https://github.com/rust-lang/miri/issues/new", |_| ());
 
     // Init loggers the Miri way.
     init_early_loggers(&handler);
@@ -581,5 +584,10 @@ fn main() {
 
     debug!("rustc arguments: {:?}", rustc_args);
     debug!("crate arguments: {:?}", miri_config.args);
-    run_compiler(rustc_args, /* target_crate: */ true, &mut MiriCompilerCalls { miri_config }, using_internal_features)
+    run_compiler(
+        rustc_args,
+        /* target_crate: */ true,
+        &mut MiriCompilerCalls { miri_config },
+        using_internal_features,
+    )
 }