Auto merge of #144058 - matthiaskrgr:rollup-xezozsk, r=matthiaskrgr

Rollup of 11 pull requests

Successful merges:

 - rust-lang/rust#143326 (Remove deprecated `Error::description` impl from `c_str::FromBytesWithNulError`)
 - rust-lang/rust#143431 (Use relative visibility when noting sealed trait to reduce false positive)
 - rust-lang/rust#143550 (resolve: Use interior mutability for extern module map)
 - rust-lang/rust#143631 (update to literal-escaper-0.0.5)
 - rust-lang/rust#143793 (Opaque type collection: Guard against endlessly recursing free alias types)
 - rust-lang/rust#143880 (tests: Test line debuginfo for linebreaked function parameters)
 - rust-lang/rust#143914 (Reword mismatched-lifetime-syntaxes text based on feedback)
 - rust-lang/rust#143926 (Remove deprecated fields in bootstrap)
 - rust-lang/rust#143955 (Make frame spans appear on a separate trace line)
 - rust-lang/rust#143975 (type_id_eq: check that the hash fully matches the type)
 - rust-lang/rust#143984 (Fix ice for feature-gated `cfg` attributes applied to the crate)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 6 insertions, 1 deletions

diff --git a/compiler/rustc_const_eval/src/interpret/stack.rs b/compiler/rustc_const_eval/src/interpret/stack.rs
index b6ba069526c..2e99bb4209f 100644
--- a/compiler/rustc_const_eval/src/interpret/stack.rs
+++ b/compiler/rustc_const_eval/src/interpret/stack.rs
@@ -12,6 +12,7 @@ use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_middle::{bug, mir};
 use rustc_mir_dataflow::impls::always_storage_live_locals;
 use rustc_span::Span;
+use tracing::field::Empty;
 use tracing::{info_span, instrument, trace};
 
 use super::{
@@ -396,7 +397,11 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         // Finish things up.
         M::after_stack_push(self)?;
         self.frame_mut().loc = Left(mir::Location::START);
-        let span = info_span!("frame", "{}", instance);
+        // `tracing_separate_thread` is used to instruct the chrome_tracing [tracing::Layer] in Miri
+        // to put the "frame" span on a separate trace thread/line than other spans, to make the
+        // visualization in https://ui.perfetto.dev easier to interpret. It is set to a value of
+        // [tracing::field::Empty] so that other tracing layers (e.g. the logger) will ignore it.
+        let span = info_span!("frame", tracing_separate_thread = Empty, "{}", instance);
         self.frame_mut().tracing_span.enter(span);
 
         interp_ok(())