From a2d03e7f185dff6299f62f6ebe992596f68b6315 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Mon, 21 Jul 2025 11:20:38 +0200
Subject: [PATCH 01/11] coretests/num: use ldexp instead of hard-coding a power
 of 2

---
 library/coretests/tests/num/dec2flt/float.rs  | 11 +++++-----
 .../coretests/tests/num/flt2dec/estimator.rs  |  4 +++-
 library/coretests/tests/num/flt2dec/mod.rs    | 20 ++----------------
 library/coretests/tests/num/mod.rs            | 21 +++++++++++++++++++
 4 files changed, 31 insertions(+), 25 deletions(-)

diff --git a/library/coretests/tests/num/dec2flt/float.rs b/library/coretests/tests/num/dec2flt/float.rs
index 193d5887749ab..c054c1e3e0f05 100644
--- a/library/coretests/tests/num/dec2flt/float.rs
+++ b/library/coretests/tests/num/dec2flt/float.rs
@@ -1,13 +1,14 @@
 use core::num::dec2flt::float::RawFloat;
 
+use crate::num::{ldexp_f16, ldexp_f32, ldexp_f64};
+
 // FIXME(f16_f128): enable on all targets once possible.
 #[test]
 #[cfg(target_has_reliable_f16)]
 fn test_f16_integer_decode() {
     assert_eq!(3.14159265359f16.integer_decode(), (1608, -9, 1));
     assert_eq!((-8573.5918555f16).integer_decode(), (1072, 3, -1));
-    #[cfg(not(miri))] // miri doesn't have powf16
-    assert_eq!(2f16.powf(14.0).integer_decode(), (1 << 10, 4, 1));
+    assert_eq!(ldexp_f16(1.0, 14).integer_decode(), (1 << 10, 4, 1));
     assert_eq!(0f16.integer_decode(), (0, -25, 1));
     assert_eq!((-0f16).integer_decode(), (0, -25, -1));
     assert_eq!(f16::INFINITY.integer_decode(), (1 << 10, 6, 1));
@@ -23,8 +24,7 @@ fn test_f16_integer_decode() {
 fn test_f32_integer_decode() {
     assert_eq!(3.14159265359f32.integer_decode(), (13176795, -22, 1));
     assert_eq!((-8573.5918555f32).integer_decode(), (8779358, -10, -1));
-    // Set 2^100 directly instead of using powf, because it doesn't guarantee precision
-    assert_eq!(1.2676506e30_f32.integer_decode(), (8388608, 77, 1));
+    assert_eq!(ldexp_f32(1.0, 100).integer_decode(), (8388608, 77, 1));
     assert_eq!(0f32.integer_decode(), (0, -150, 1));
     assert_eq!((-0f32).integer_decode(), (0, -150, -1));
     assert_eq!(f32::INFINITY.integer_decode(), (8388608, 105, 1));
@@ -40,8 +40,7 @@ fn test_f32_integer_decode() {
 fn test_f64_integer_decode() {
     assert_eq!(3.14159265359f64.integer_decode(), (7074237752028906, -51, 1));
     assert_eq!((-8573.5918555f64).integer_decode(), (4713381968463931, -39, -1));
-    // Set 2^100 directly instead of using powf, because it doesn't guarantee precision
-    assert_eq!(1.2676506002282294e30_f64.integer_decode(), (4503599627370496, 48, 1));
+    assert_eq!(ldexp_f64(1.0, 100).integer_decode(), (4503599627370496, 48, 1));
     assert_eq!(0f64.integer_decode(), (0, -1075, 1));
     assert_eq!((-0f64).integer_decode(), (0, -1075, -1));
     assert_eq!(f64::INFINITY.integer_decode(), (4503599627370496, 972, 1));
diff --git a/library/coretests/tests/num/flt2dec/estimator.rs b/library/coretests/tests/num/flt2dec/estimator.rs
index da203b5f3620e..f53282611f686 100644
--- a/library/coretests/tests/num/flt2dec/estimator.rs
+++ b/library/coretests/tests/num/flt2dec/estimator.rs
@@ -1,5 +1,7 @@
 use core::num::flt2dec::estimator::*;
 
+use crate::num::ldexp_f64;
+
 #[test]
 fn test_estimate_scaling_factor() {
     macro_rules! assert_almost_eq {
@@ -56,7 +58,7 @@ fn test_estimate_scaling_factor() {
     let step = if cfg!(miri) { 37 } else { 1 };
 
     for i in (-1074..972).step_by(step) {
-        let expected = super::ldexp_f64(1.0, i).log10().ceil();
+        let expected = ldexp_f64(1.0, i).log10().ceil();
         assert_almost_eq!(estimate_scaling_factor(1, i as i16), expected as i16);
     }
 }
diff --git a/library/coretests/tests/num/flt2dec/mod.rs b/library/coretests/tests/num/flt2dec/mod.rs
index ce36db33d05f3..75bcd5fb49491 100644
--- a/library/coretests/tests/num/flt2dec/mod.rs
+++ b/library/coretests/tests/num/flt2dec/mod.rs
@@ -6,6 +6,8 @@ use core::num::fmt::{Formatted, Part};
 use std::mem::MaybeUninit;
 use std::{fmt, str};
 
+use crate::num::{ldexp_f16, ldexp_f32, ldexp_f64};
+
 mod estimator;
 mod strategy {
     mod dragon;
@@ -75,24 +77,6 @@ macro_rules! try_fixed {
     })
 }
 
-#[cfg(target_has_reliable_f16)]
-fn ldexp_f16(a: f16, b: i32) -> f16 {
-    ldexp_f64(a as f64, b) as f16
-}
-
-fn ldexp_f32(a: f32, b: i32) -> f32 {
-    ldexp_f64(a as f64, b) as f32
-}
-
-fn ldexp_f64(a: f64, b: i32) -> f64 {
-    unsafe extern "C" {
-        fn ldexp(x: f64, n: i32) -> f64;
-    }
-    // SAFETY: assuming a correct `ldexp` has been supplied, the given arguments cannot possibly
-    // cause undefined behavior
-    unsafe { ldexp(a, b) }
-}
-
 fn check_exact<F, T>(mut f: F, v: T, vstr: &str, expected: &[u8], expectedk: i16)
 where
     T: DecodableFloat,
diff --git a/library/coretests/tests/num/mod.rs b/library/coretests/tests/num/mod.rs
index f340926292c88..54e54f734f647 100644
--- a/library/coretests/tests/num/mod.rs
+++ b/library/coretests/tests/num/mod.rs
@@ -54,6 +54,27 @@ macro_rules! assume_usize_width {
     }
 }
 
+/// Return `a * 2^b`.
+#[cfg(target_has_reliable_f16)]
+fn ldexp_f16(a: f16, b: i32) -> f16 {
+    ldexp_f64(a as f64, b) as f16
+}
+
+/// Return `a * 2^b`.
+fn ldexp_f32(a: f32, b: i32) -> f32 {
+    ldexp_f64(a as f64, b) as f32
+}
+
+/// Return `a * 2^b`.
+fn ldexp_f64(a: f64, b: i32) -> f64 {
+    unsafe extern "C" {
+        fn ldexp(x: f64, n: i32) -> f64;
+    }
+    // SAFETY: assuming a correct `ldexp` has been supplied, the given arguments cannot possibly
+    // cause undefined behavior
+    unsafe { ldexp(a, b) }
+}
+
 /// Helper function for testing numeric operations
 pub fn test_num<T>(ten: T, two: T)
 where

From bcaa79529d351416a2ab1c07931a0ba05b99c9c3 Mon Sep 17 00:00:00 2001
From: Kivooeo <Kivooeo123@gmail.com>
Date: Sat, 19 Jul 2025 15:18:21 +0500
Subject: [PATCH 02/11] removed tidy check on issues files

---
 src/tools/tidy/src/issues.txt  | 1224 --------------------------------
 src/tools/tidy/src/ui_tests.rs |   55 +-
 triagebot.toml                 |    6 +
 3 files changed, 10 insertions(+), 1275 deletions(-)

diff --git a/src/tools/tidy/src/issues.txt b/src/tools/tidy/src/issues.txt
index 77414bec82d35..ee06707415f59 100644
--- a/src/tools/tidy/src/issues.txt
+++ b/src/tools/tidy/src/issues.txt
@@ -1364,1230 +1364,6 @@ ui/infinite/issue-41731-infinite-macro-println.rs
 ui/intrinsics/issue-28575.rs
 ui/intrinsics/issue-84297-reifying-copy.rs
 ui/invalid/issue-114435-layout-type-err.rs
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-ui/issues/issue-9837.rs
-ui/issues/issue-9906.rs
-ui/issues/issue-9918.rs
-ui/issues/issue-9942.rs
-ui/issues/issue-9951.rs
-ui/issues/issue-9968.rs
-ui/issues/issue-99838.rs
 ui/iterators/issue-28098.rs
 ui/iterators/issue-58952-filter-type-length.rs
 ui/lang-items/issue-83471.rs
diff --git a/src/tools/tidy/src/ui_tests.rs b/src/tools/tidy/src/ui_tests.rs
index b9d22ece59752..4d195b3952e27 100644
--- a/src/tools/tidy/src/ui_tests.rs
+++ b/src/tools/tidy/src/ui_tests.rs
@@ -1,24 +1,12 @@
 //! Tidy check to ensure below in UI test directories:
-//! - the number of entries in each directory must be less than `ENTRY_LIMIT`
 //! - there are no stray `.stderr` files
 
-use std::collections::{BTreeSet, HashMap};
+use std::collections::BTreeSet;
 use std::ffi::OsStr;
 use std::fs;
 use std::io::Write;
 use std::path::{Path, PathBuf};
 
-use ignore::Walk;
-
-// FIXME: GitHub's UI truncates file lists that exceed 1000 entries, so these
-// should all be 1000 or lower. Limits significantly smaller than 1000 are also
-// desirable, because large numbers of files are unwieldy in general. See issue
-// #73494.
-const ENTRY_LIMIT: u32 = 901;
-// FIXME: The following limits should be reduced eventually.
-
-const ISSUES_ENTRY_LIMIT: u32 = 1616;
-
 const EXPECTED_TEST_FILE_EXTENSIONS: &[&str] = &[
     "rs",     // test source files
     "stderr", // expected stderr file, corresponds to a rs file
@@ -54,42 +42,6 @@ const EXTENSION_EXCEPTION_PATHS: &[&str] = &[
     "tests/ui/std/windows-bat-args3.bat", // tests escaping arguments through batch files
 ];
 
-fn check_entries(tests_path: &Path, bad: &mut bool) {
-    let mut directories: HashMap<PathBuf, u32> = HashMap::new();
-
-    for entry in Walk::new(tests_path.join("ui")).flatten() {
-        let parent = entry.path().parent().unwrap().to_path_buf();
-        *directories.entry(parent).or_default() += 1;
-    }
-
-    let (mut max, mut max_issues) = (0, 0);
-    for (dir_path, count) in directories {
-        let is_issues_dir = tests_path.join("ui/issues") == dir_path;
-        let (limit, maxcnt) = if is_issues_dir {
-            (ISSUES_ENTRY_LIMIT, &mut max_issues)
-        } else {
-            (ENTRY_LIMIT, &mut max)
-        };
-        *maxcnt = (*maxcnt).max(count);
-        if count > limit {
-            tidy_error!(
-                bad,
-                "following path contains more than {} entries, \
-                    you should move the test to some relevant subdirectory (current: {}): {}",
-                limit,
-                count,
-                dir_path.display()
-            );
-        }
-    }
-    if ISSUES_ENTRY_LIMIT > max_issues {
-        tidy_error!(
-            bad,
-            "`ISSUES_ENTRY_LIMIT` is too high (is {ISSUES_ENTRY_LIMIT}, should be {max_issues})"
-        );
-    }
-}
-
 pub fn check(root_path: &Path, bless: bool, bad: &mut bool) {
     let issues_txt_header = r#"============================================================
     ⚠️⚠️⚠️NOTHING SHOULD EVER BE ADDED TO THIS LIST⚠️⚠️⚠️
@@ -97,7 +49,6 @@ pub fn check(root_path: &Path, bless: bool, bad: &mut bool) {
 "#;
 
     let path = &root_path.join("tests");
-    check_entries(path, bad);
 
     // the list of files in ui tests that are allowed to start with `issue-XXXX`
     // BTreeSet because we would like a stable ordering so --bless works
@@ -179,7 +130,9 @@ pub fn check(root_path: &Path, bless: bool, bad: &mut bool) {
                     .unwrap()
                     .replace(std::path::MAIN_SEPARATOR_STR, "/");
 
-                if !remaining_issue_names.remove(stripped_path.as_str()) {
+                if !remaining_issue_names.remove(stripped_path.as_str())
+                    && !stripped_path.starts_with("ui/issues/")
+                {
                     tidy_error!(
                         bad,
                         "file `tests/{stripped_path}` must begin with a descriptive name, consider `{{reason}}-issue-{issue_n}.rs`",
diff --git a/triagebot.toml b/triagebot.toml
index 61d8a814c89ee..4aec1251c7e7c 100644
--- a/triagebot.toml
+++ b/triagebot.toml
@@ -1147,6 +1147,12 @@ cc = ["@nnethercote"]
 message = "Changes to the size of AST and/or HIR nodes."
 cc = ["@nnethercote"]
 
+[mentions."tests/ui/issues"]
+message = """
+This PR modifies `tests/ui/issues/`. If this PR is adding new tests to `tests/ui/issues/`,
+please refrain from doing so, and instead add it to more descriptive subdirectories.
+"""
+
 [mentions."compiler/rustc_sanitizers"]
 cc = ["@rcvalle"]
 

From 58537fb869a8e08d5146e8feab982f17b3fd990a Mon Sep 17 00:00:00 2001
From: roblabla <unfiltered@roblab.la>
Date: Mon, 21 Jul 2025 01:32:26 +0200
Subject: [PATCH 03/11] Fix broken TLS destructors on 32-bit win7

On the 32-bit win7 target, we use OS TLS instead of native TLS, due to
issues with how the OS handles alignment. Unfortunately, this caused
issues due to the TLS destructors not running, causing memory leaks
among other problems.

On Windows, to support OS TLS, the TlsAlloc family of function is used
by Rust. This function does not support TLS destructors at all. However,
rust has some code to emulate those destructors, by leveraging the TLS
support functionality found in the MSVC CRT (specifically, in tlssup.c
of the CRT). Specifically, the CRT provides the ability to register
callbacks that are called (among other things) on thread destruction. By
registering our own callback, we can run through a list of registered
destructors functions to execute.

To use this functionality, the user must do two things:

1. They must put the address to their callback in a section between
   `.CRT$XLB` and `.CRT$XLY`.
2. They must add a reference to `_tls_used` (or `__tls_used` on x86) to
   make sure the TLS support code in tlssup.c isn't garbage collected by
   the linker.

Prior to this commit, this second bit wasn't being done properly by the
Rust TLS support code. Instead of adding a reference to _tls_used, it
instead had a reference to its own callback to prevent it from getting
GC'd by the linker. While this is _also_ necessary, not having a
reference on _tls_used made the entire support non-functional.

This commit reworks the code to:

1. Add an unconditional `#[used]` attribute on the CALLBACK, which
   should be enough to prevent it from getting GC'd by the linker.
2. Add a reference to `_tls_used`, which should pull the TLS support
   code into the Rust programs and not let it be GC'd by the linker.
---
 .../std/src/sys/thread_local/guard/windows.rs   | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/library/std/src/sys/thread_local/guard/windows.rs b/library/std/src/sys/thread_local/guard/windows.rs
index b15a0d7c0bdfb..f747129465d6d 100644
--- a/library/std/src/sys/thread_local/guard/windows.rs
+++ b/library/std/src/sys/thread_local/guard/windows.rs
@@ -58,7 +58,7 @@
 //! We don't actually use the `/INCLUDE` linker flag here like the article
 //! mentions because the Rust compiler doesn't propagate linker flags, but
 //! instead we use a shim function which performs a volatile 1-byte load from
-//! the address of the symbol to ensure it sticks around.
+//! the address of the _tls_used symbol to ensure it sticks around.
 //!
 //! [1]: https://www.codeproject.com/Articles/8113/Thread-Local-Storage-The-C-Way
 //! [2]: https://github.com/ChromiumWebApps/chromium/blob/master/base/threading/thread_local_storage_win.cc#L42
@@ -68,9 +68,20 @@ use core::ffi::c_void;
 use crate::ptr;
 use crate::sys::c;
 
+unsafe extern "C" {
+    #[link_name = "_tls_used"]
+    static TLS_USED: u8;
+}
 pub fn enable() {
-    // When destructors are used, we don't want LLVM eliminating CALLBACK for any
-    // reason. Once the symbol makes it to the linker, it will do the rest.
+    // When destructors are used, we need to add a reference to the _tls_used
+    // symbol provided by the CRT, otherwise the TLS support code will get
+    // GC'd by the linker and our callback won't be called.
+    unsafe { ptr::from_ref(&TLS_USED).read_volatile() };
+    // We also need to reference CALLBACK to make sure it does not get GC'd
+    // by the compiler/LLVM. The callback will end up inside the TLS
+    // callback array pointed to by _TLS_USED through linker shenanigans,
+    // but as far as the compiler is concerned, it looks like the data is
+    // unused, so we need this hack to prevent it from disappearing.
     unsafe { ptr::from_ref(&CALLBACK).read_volatile() };
 }
 

From b2f8b406335310f885a0d2d21ff8472b6a5f9ce5 Mon Sep 17 00:00:00 2001
From: Oli Scherer <github333195615777966@oli-obk.de>
Date: Mon, 21 Jul 2025 13:16:10 +0000
Subject: [PATCH 04/11] Don't ICE on non-TypeId metadata within TypeId

---
 .../rustc_const_eval/src/interpret/memory.rs     |  2 +-
 tests/ui/consts/const_transmute_type_id6.rs      | 16 ++++++++++++++++
 tests/ui/consts/const_transmute_type_id6.stderr  | 15 +++++++++++++++
 3 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 tests/ui/consts/const_transmute_type_id6.rs
 create mode 100644 tests/ui/consts/const_transmute_type_id6.stderr

diff --git a/compiler/rustc_const_eval/src/interpret/memory.rs b/compiler/rustc_const_eval/src/interpret/memory.rs
index 20c8e983ceaef..20825d2ad9b5e 100644
--- a/compiler/rustc_const_eval/src/interpret/memory.rs
+++ b/compiler/rustc_const_eval/src/interpret/memory.rs
@@ -997,7 +997,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         ptr: Pointer<Option<M::Provenance>>,
     ) -> InterpResult<'tcx, (Ty<'tcx>, u64)> {
         let (alloc_id, offset, _meta) = self.ptr_get_alloc_id(ptr, 0)?;
-        let GlobalAlloc::TypeId { ty } = self.tcx.global_alloc(alloc_id) else {
+        let Some(GlobalAlloc::TypeId { ty }) = self.tcx.try_get_global_alloc(alloc_id) else {
             throw_ub_format!("invalid `TypeId` value: not all bytes carry type id metadata")
         };
         interp_ok((ty, offset.bytes()))
diff --git a/tests/ui/consts/const_transmute_type_id6.rs b/tests/ui/consts/const_transmute_type_id6.rs
new file mode 100644
index 0000000000000..668eb0bb2b0fd
--- /dev/null
+++ b/tests/ui/consts/const_transmute_type_id6.rs
@@ -0,0 +1,16 @@
+//! Test that we do not ICE and that we do report an error
+//! when placing non-TypeId provenance into a TypeId.
+
+#![feature(const_trait_impl, const_cmp)]
+
+use std::any::TypeId;
+use std::mem::transmute;
+
+const X: bool = {
+    let a = ();
+    let id: TypeId = unsafe { transmute([&raw const a; 16 / size_of::<*const ()>()]) };
+    id == id
+    //~^ ERROR: invalid `TypeId` value: not all bytes carry type id metadata
+};
+
+fn main() {}
diff --git a/tests/ui/consts/const_transmute_type_id6.stderr b/tests/ui/consts/const_transmute_type_id6.stderr
new file mode 100644
index 0000000000000..f5d90256e7c6a
--- /dev/null
+++ b/tests/ui/consts/const_transmute_type_id6.stderr
@@ -0,0 +1,15 @@
+error[E0080]: invalid `TypeId` value: not all bytes carry type id metadata
+  --> $DIR/const_transmute_type_id6.rs:12:5
+   |
+LL |     id == id
+   |     ^^^^^^^^ evaluation of `X` failed inside this call
+   |
+note: inside `<TypeId as PartialEq>::eq`
+  --> $SRC_DIR/core/src/any.rs:LL:COL
+note: inside `<TypeId as PartialEq>::eq::compiletime`
+  --> $SRC_DIR/core/src/any.rs:LL:COL
+   = note: this error originates in the macro `$crate::intrinsics::const_eval_select` which comes from the expansion of the macro `crate::intrinsics::const_eval_select` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0080`.

From 6df15a172e7cd26fa59826fbc123938fabe260bb Mon Sep 17 00:00:00 2001
From: Makai <m4kai410@gmail.com>
Date: Wed, 16 Jul 2025 12:10:39 +0000
Subject: [PATCH 05/11] update SUMMARY.md

---
 tests/ui/SUMMARY.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/ui/SUMMARY.md b/tests/ui/SUMMARY.md
index 1aeb0fcfbea6c..b635b6326fce7 100644
--- a/tests/ui/SUMMARY.md
+++ b/tests/ui/SUMMARY.md
@@ -1277,9 +1277,9 @@ See [Tracking issue for specialization (RFC 1210) #31844](https://github.com/rus
 
 Stability attributes used internally by the standard library: `#[stable()]` and `#[unstable()]`.
 
-## `tests/ui/stable-mir-print/`
+## `tests/ui/rustc_public-ir-print/`
 
-Some tests for pretty printing of StableMIR.
+Some tests for pretty printing of rustc_public's IR.
 
 ## `tests/ui/stack-protector/`: `-Z stack-protector` command line flag
 

From 551cb9f1f4fa315639033e3db39794e10a14b7f7 Mon Sep 17 00:00:00 2001
From: Josh Triplett <josh@joshtriplett.org>
Date: Tue, 22 Jul 2025 00:32:59 -0700
Subject: [PATCH 06/11] mbe: Use concrete type for `get_unused_rule`

Rather than adding `get_unused_rule` to the `TTMacroExpander` trait, put
it on the concrete `MacroRulesMacroExpander`, and downcast to that type
via `Any` in order to call it.

Suggested-by: Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
---
 compiler/rustc_expand/src/base.rs            |  9 +++------
 compiler/rustc_expand/src/lib.rs             |  2 +-
 compiler/rustc_expand/src/mbe/macro_rules.rs | 16 +++++++++-------
 compiler/rustc_resolve/src/macros.rs         |  9 +++++++--
 4 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/compiler/rustc_expand/src/base.rs b/compiler/rustc_expand/src/base.rs
index 1928cfd90482b..25ec540111117 100644
--- a/compiler/rustc_expand/src/base.rs
+++ b/compiler/rustc_expand/src/base.rs
@@ -1,3 +1,4 @@
+use std::any::Any;
 use std::default::Default;
 use std::iter;
 use std::path::Component::Prefix;
@@ -361,17 +362,13 @@ where
 }
 
 /// Represents a thing that maps token trees to Macro Results
-pub trait TTMacroExpander {
+pub trait TTMacroExpander: Any {
     fn expand<'cx>(
         &self,
         ecx: &'cx mut ExtCtxt<'_>,
         span: Span,
         input: TokenStream,
     ) -> MacroExpanderResult<'cx>;
-
-    fn get_unused_rule(&self, _rule_i: usize) -> Option<(&Ident, Span)> {
-        None
-    }
 }
 
 pub type MacroExpanderResult<'cx> = ExpandResult<Box<dyn MacResult + 'cx>, ()>;
@@ -379,7 +376,7 @@ pub type MacroExpanderResult<'cx> = ExpandResult<Box<dyn MacResult + 'cx>, ()>;
 pub type MacroExpanderFn =
     for<'cx> fn(&'cx mut ExtCtxt<'_>, Span, TokenStream) -> MacroExpanderResult<'cx>;
 
-impl<F> TTMacroExpander for F
+impl<F: 'static> TTMacroExpander for F
 where
     F: for<'cx> Fn(&'cx mut ExtCtxt<'_>, Span, TokenStream) -> MacroExpanderResult<'cx>,
 {
diff --git a/compiler/rustc_expand/src/lib.rs b/compiler/rustc_expand/src/lib.rs
index 64be7649775f3..b54dabbb8e26f 100644
--- a/compiler/rustc_expand/src/lib.rs
+++ b/compiler/rustc_expand/src/lib.rs
@@ -22,7 +22,7 @@ mod placeholders;
 mod proc_macro_server;
 mod stats;
 
-pub use mbe::macro_rules::compile_declarative_macro;
+pub use mbe::macro_rules::{MacroRulesMacroExpander, compile_declarative_macro};
 pub mod base;
 pub mod config;
 pub mod expand;
diff --git a/compiler/rustc_expand/src/mbe/macro_rules.rs b/compiler/rustc_expand/src/mbe/macro_rules.rs
index 2d792355b2788..2f713a09b95e6 100644
--- a/compiler/rustc_expand/src/mbe/macro_rules.rs
+++ b/compiler/rustc_expand/src/mbe/macro_rules.rs
@@ -128,7 +128,7 @@ pub(super) struct MacroRule {
     rhs: mbe::TokenTree,
 }
 
-struct MacroRulesMacroExpander {
+pub struct MacroRulesMacroExpander {
     node_id: NodeId,
     name: Ident,
     span: Span,
@@ -136,6 +136,14 @@ struct MacroRulesMacroExpander {
     rules: Vec<MacroRule>,
 }
 
+impl MacroRulesMacroExpander {
+    pub fn get_unused_rule(&self, rule_i: usize) -> Option<(&Ident, Span)> {
+        // If the rhs contains an invocation like `compile_error!`, don't report it as unused.
+        let rule = &self.rules[rule_i];
+        if has_compile_error_macro(&rule.rhs) { None } else { Some((&self.name, rule.lhs_span)) }
+    }
+}
+
 impl TTMacroExpander for MacroRulesMacroExpander {
     fn expand<'cx>(
         &self,
@@ -154,12 +162,6 @@ impl TTMacroExpander for MacroRulesMacroExpander {
             &self.rules,
         ))
     }
-
-    fn get_unused_rule(&self, rule_i: usize) -> Option<(&Ident, Span)> {
-        // If the rhs contains an invocation like `compile_error!`, don't report it as unused.
-        let rule = &self.rules[rule_i];
-        if has_compile_error_macro(&rule.rhs) { None } else { Some((&self.name, rule.lhs_span)) }
-    }
 }
 
 struct DummyExpander(ErrorGuaranteed);
diff --git a/compiler/rustc_resolve/src/macros.rs b/compiler/rustc_resolve/src/macros.rs
index 77ef7f56c094c..333fc808d1b80 100644
--- a/compiler/rustc_resolve/src/macros.rs
+++ b/compiler/rustc_resolve/src/macros.rs
@@ -1,6 +1,7 @@
 //! A bunch of methods and structures more or less related to resolving macros and
 //! interface provided by `Resolver` to macro expander.
 
+use std::any::Any;
 use std::cell::Cell;
 use std::mem;
 use std::sync::Arc;
@@ -13,10 +14,10 @@ use rustc_expand::base::{
     Annotatable, DeriveResolution, Indeterminate, ResolverExpand, SyntaxExtension,
     SyntaxExtensionKind,
 };
-use rustc_expand::compile_declarative_macro;
 use rustc_expand::expand::{
     AstFragment, AstFragmentKind, Invocation, InvocationKind, SupportsMacroExpansion,
 };
+use rustc_expand::{MacroRulesMacroExpander, compile_declarative_macro};
 use rustc_hir::def::{self, DefKind, Namespace, NonMacroAttrKind};
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId};
 use rustc_middle::middle::stability;
@@ -357,8 +358,12 @@ impl<'ra, 'tcx> ResolverExpand for Resolver<'ra, 'tcx> {
             let SyntaxExtensionKind::LegacyBang(ref ext) = m.ext.kind else {
                 continue;
             };
+            let ext: &dyn Any = ext.as_ref();
+            let Some(m) = ext.downcast_ref::<MacroRulesMacroExpander>() else {
+                continue;
+            };
             for arm_i in unused_arms.iter() {
-                if let Some((ident, rule_span)) = ext.get_unused_rule(arm_i) {
+                if let Some((ident, rule_span)) = m.get_unused_rule(arm_i) {
                     self.lint_buffer.buffer_lint(
                         UNUSED_MACRO_RULES,
                         node_id,

From f877aa7d14916f71a2f88c6d4c009e7ded7684c4 Mon Sep 17 00:00:00 2001
From: Zalathar <Zalathar@users.noreply.github.com>
Date: Sun, 4 May 2025 14:09:52 +1000
Subject: [PATCH 07/11] coverage: Enlarge empty spans during MIR
 instrumentation, not codegen

This allows us to assume that coverage spans will only be discarded during
codegen in very unusual situations.
---
 .../src/coverageinfo/mapgen/spans.rs          | 28 ++------------
 .../rustc_mir_transform/src/coverage/spans.rs | 38 ++++++++++++++++++-
 tests/coverage/async_closure.cov-map          | 21 +++++-----
 ...ch_match_arms.main.InstrumentCoverage.diff |  2 +-
 ...ument_coverage.bar.InstrumentCoverage.diff |  2 +-
 ...ment_coverage.main.InstrumentCoverage.diff |  4 +-
 ...rage_cleanup.main.CleanupPostBorrowck.diff |  4 +-
 ...erage_cleanup.main.InstrumentCoverage.diff |  4 +-
 8 files changed, 57 insertions(+), 46 deletions(-)

diff --git a/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/spans.rs b/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/spans.rs
index 39a59560c9d3e..574463be7ffe0 100644
--- a/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/spans.rs
+++ b/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/spans.rs
@@ -39,7 +39,10 @@ impl Coords {
 /// or other expansions), and if it does happen then skipping a span or function is
 /// better than an ICE or `llvm-cov` failure that the user might have no way to avoid.
 pub(crate) fn make_coords(source_map: &SourceMap, file: &SourceFile, span: Span) -> Option<Coords> {
-    let span = ensure_non_empty_span(source_map, span)?;
+    if span.is_empty() {
+        debug_assert!(false, "can't make coords from empty span: {span:?}");
+        return None;
+    }
 
     let lo = span.lo();
     let hi = span.hi();
@@ -70,29 +73,6 @@ pub(crate) fn make_coords(source_map: &SourceMap, file: &SourceFile, span: Span)
     })
 }
 
-fn ensure_non_empty_span(source_map: &SourceMap, span: Span) -> Option<Span> {
-    if !span.is_empty() {
-        return Some(span);
-    }
-
-    // The span is empty, so try to enlarge it to cover an adjacent '{' or '}'.
-    source_map
-        .span_to_source(span, |src, start, end| try {
-            // Adjusting span endpoints by `BytePos(1)` is normally a bug,
-            // but in this case we have specifically checked that the character
-            // we're skipping over is one of two specific ASCII characters, so
-            // adjusting by exactly 1 byte is correct.
-            if src.as_bytes().get(end).copied() == Some(b'{') {
-                Some(span.with_hi(span.hi() + BytePos(1)))
-            } else if start > 0 && src.as_bytes()[start - 1] == b'}' {
-                Some(span.with_lo(span.lo() - BytePos(1)))
-            } else {
-                None
-            }
-        })
-        .ok()?
-}
-
 /// If `llvm-cov` sees a source region that is improperly ordered (end < start),
 /// it will immediately exit with a fatal error. To prevent that from happening,
 /// discard regions that are improperly ordered, or might be interpreted in a
diff --git a/compiler/rustc_mir_transform/src/coverage/spans.rs b/compiler/rustc_mir_transform/src/coverage/spans.rs
index ec76076020eb7..ddeae093df5b7 100644
--- a/compiler/rustc_mir_transform/src/coverage/spans.rs
+++ b/compiler/rustc_mir_transform/src/coverage/spans.rs
@@ -1,7 +1,8 @@
 use rustc_data_structures::fx::FxHashSet;
 use rustc_middle::mir;
 use rustc_middle::ty::TyCtxt;
-use rustc_span::{DesugaringKind, ExpnKind, MacroKind, Span};
+use rustc_span::source_map::SourceMap;
+use rustc_span::{BytePos, DesugaringKind, ExpnKind, MacroKind, Span};
 use tracing::instrument;
 
 use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph};
@@ -83,8 +84,18 @@ pub(super) fn extract_refined_covspans<'tcx>(
     // Discard any span that overlaps with a hole.
     discard_spans_overlapping_holes(&mut covspans, &holes);
 
-    // Perform more refinement steps after holes have been dealt with.
+    // Discard spans that overlap in unwanted ways.
     let mut covspans = remove_unwanted_overlapping_spans(covspans);
+
+    // For all empty spans, either enlarge them to be non-empty, or discard them.
+    let source_map = tcx.sess.source_map();
+    covspans.retain_mut(|covspan| {
+        let Some(span) = ensure_non_empty_span(source_map, covspan.span) else { return false };
+        covspan.span = span;
+        true
+    });
+
+    // Merge covspans that can be merged.
     covspans.dedup_by(|b, a| a.merge_if_eligible(b));
 
     code_mappings.extend(covspans.into_iter().map(|Covspan { span, bcb }| {
@@ -230,3 +241,26 @@ fn compare_spans(a: Span, b: Span) -> std::cmp::Ordering {
         // - Both have the same start and span A extends further right
         .then_with(|| Ord::cmp(&a.hi(), &b.hi()).reverse())
 }
+
+fn ensure_non_empty_span(source_map: &SourceMap, span: Span) -> Option<Span> {
+    if !span.is_empty() {
+        return Some(span);
+    }
+
+    // The span is empty, so try to enlarge it to cover an adjacent '{' or '}'.
+    source_map
+        .span_to_source(span, |src, start, end| try {
+            // Adjusting span endpoints by `BytePos(1)` is normally a bug,
+            // but in this case we have specifically checked that the character
+            // we're skipping over is one of two specific ASCII characters, so
+            // adjusting by exactly 1 byte is correct.
+            if src.as_bytes().get(end).copied() == Some(b'{') {
+                Some(span.with_hi(span.hi() + BytePos(1)))
+            } else if start > 0 && src.as_bytes()[start - 1] == b'}' {
+                Some(span.with_lo(span.lo() - BytePos(1)))
+            } else {
+                None
+            }
+        })
+        .ok()?
+}
diff --git a/tests/coverage/async_closure.cov-map b/tests/coverage/async_closure.cov-map
index 9f8dc8d6cbbae..53128dd7a48b0 100644
--- a/tests/coverage/async_closure.cov-map
+++ b/tests/coverage/async_closure.cov-map
@@ -37,32 +37,29 @@ Number of file 0 mappings: 8
 Highest counter ID seen: c0
 
 Function name: async_closure::main::{closure#0}
-Raw bytes (14): 0x[01, 01, 00, 02, 01, 0b, 22, 00, 23, 01, 00, 23, 00, 24]
+Raw bytes (9): 0x[01, 01, 00, 01, 01, 0b, 22, 00, 24]
 Number of files: 1
 - file 0 => $DIR/async_closure.rs
 Number of expressions: 0
-Number of file 0 mappings: 2
-- Code(Counter(0)) at (prev + 11, 34) to (start + 0, 35)
-- Code(Counter(0)) at (prev + 0, 35) to (start + 0, 36)
+Number of file 0 mappings: 1
+- Code(Counter(0)) at (prev + 11, 34) to (start + 0, 36)
 Highest counter ID seen: c0
 
 Function name: async_closure::main::{closure#0}
-Raw bytes (14): 0x[01, 01, 00, 02, 01, 0b, 22, 00, 23, 01, 00, 23, 00, 24]
+Raw bytes (9): 0x[01, 01, 00, 01, 01, 0b, 22, 00, 24]
 Number of files: 1
 - file 0 => $DIR/async_closure.rs
 Number of expressions: 0
-Number of file 0 mappings: 2
-- Code(Counter(0)) at (prev + 11, 34) to (start + 0, 35)
-- Code(Counter(0)) at (prev + 0, 35) to (start + 0, 36)
+Number of file 0 mappings: 1
+- Code(Counter(0)) at (prev + 11, 34) to (start + 0, 36)
 Highest counter ID seen: c0
 
 Function name: async_closure::main::{closure#0}::{closure#0}::<i16>
-Raw bytes (14): 0x[01, 01, 00, 02, 01, 0b, 22, 00, 23, 01, 00, 23, 00, 24]
+Raw bytes (9): 0x[01, 01, 00, 01, 01, 0b, 22, 00, 24]
 Number of files: 1
 - file 0 => $DIR/async_closure.rs
 Number of expressions: 0
-Number of file 0 mappings: 2
-- Code(Counter(0)) at (prev + 11, 34) to (start + 0, 35)
-- Code(Counter(0)) at (prev + 0, 35) to (start + 0, 36)
+Number of file 0 mappings: 1
+- Code(Counter(0)) at (prev + 11, 34) to (start + 0, 36)
 Highest counter ID seen: c0
 
diff --git a/tests/mir-opt/coverage/branch_match_arms.main.InstrumentCoverage.diff b/tests/mir-opt/coverage/branch_match_arms.main.InstrumentCoverage.diff
index d465b8bded22f..fa88211383a04 100644
--- a/tests/mir-opt/coverage/branch_match_arms.main.InstrumentCoverage.diff
+++ b/tests/mir-opt/coverage/branch_match_arms.main.InstrumentCoverage.diff
@@ -40,7 +40,7 @@
 +     coverage Code { bcb: bcb5 } => $DIR/branch_match_arms.rs:19:17: 19:18 (#0);
 +     coverage Code { bcb: bcb5 } => $DIR/branch_match_arms.rs:19:23: 19:30 (#0);
 +     coverage Code { bcb: bcb5 } => $DIR/branch_match_arms.rs:19:31: 19:32 (#0);
-+     coverage Code { bcb: bcb2 } => $DIR/branch_match_arms.rs:21:2: 21:2 (#0);
++     coverage Code { bcb: bcb2 } => $DIR/branch_match_arms.rs:21:1: 21:2 (#0);
 + 
       bb0: {
 +         Coverage::VirtualCounter(bcb0);
diff --git a/tests/mir-opt/coverage/instrument_coverage.bar.InstrumentCoverage.diff b/tests/mir-opt/coverage/instrument_coverage.bar.InstrumentCoverage.diff
index cf6d85abd80ef..9b6d2b22087b6 100644
--- a/tests/mir-opt/coverage/instrument_coverage.bar.InstrumentCoverage.diff
+++ b/tests/mir-opt/coverage/instrument_coverage.bar.InstrumentCoverage.diff
@@ -6,7 +6,7 @@
   
 +     coverage Code { bcb: bcb0 } => $DIR/instrument_coverage.rs:27:1: 27:17 (#0);
 +     coverage Code { bcb: bcb0 } => $DIR/instrument_coverage.rs:28:5: 28:9 (#0);
-+     coverage Code { bcb: bcb0 } => $DIR/instrument_coverage.rs:29:2: 29:2 (#0);
++     coverage Code { bcb: bcb0 } => $DIR/instrument_coverage.rs:29:1: 29:2 (#0);
 + 
       bb0: {
 +         Coverage::VirtualCounter(bcb0);
diff --git a/tests/mir-opt/coverage/instrument_coverage.main.InstrumentCoverage.diff b/tests/mir-opt/coverage/instrument_coverage.main.InstrumentCoverage.diff
index 980c5e202ffd8..b2bb2375aee60 100644
--- a/tests/mir-opt/coverage/instrument_coverage.main.InstrumentCoverage.diff
+++ b/tests/mir-opt/coverage/instrument_coverage.main.InstrumentCoverage.diff
@@ -10,8 +10,8 @@
 +     coverage Code { bcb: bcb0 } => $DIR/instrument_coverage.rs:13:1: 13:10 (#0);
 +     coverage Code { bcb: bcb1 } => $DIR/instrument_coverage.rs:15:12: 15:15 (#0);
 +     coverage Code { bcb: bcb2 } => $DIR/instrument_coverage.rs:16:13: 16:18 (#0);
-+     coverage Code { bcb: bcb3 } => $DIR/instrument_coverage.rs:17:10: 17:10 (#0);
-+     coverage Code { bcb: bcb2 } => $DIR/instrument_coverage.rs:19:2: 19:2 (#0);
++     coverage Code { bcb: bcb3 } => $DIR/instrument_coverage.rs:17:9: 17:10 (#0);
++     coverage Code { bcb: bcb2 } => $DIR/instrument_coverage.rs:19:1: 19:2 (#0);
 + 
       bb0: {
 +         Coverage::VirtualCounter(bcb0);
diff --git a/tests/mir-opt/coverage/instrument_coverage_cleanup.main.CleanupPostBorrowck.diff b/tests/mir-opt/coverage/instrument_coverage_cleanup.main.CleanupPostBorrowck.diff
index b707cd41788ac..2eb78c08ee800 100644
--- a/tests/mir-opt/coverage/instrument_coverage_cleanup.main.CleanupPostBorrowck.diff
+++ b/tests/mir-opt/coverage/instrument_coverage_cleanup.main.CleanupPostBorrowck.diff
@@ -10,8 +10,8 @@
       coverage Code { bcb: bcb0 } => $DIR/instrument_coverage_cleanup.rs:13:1: 13:10 (#0);
       coverage Code { bcb: bcb0 } => $DIR/instrument_coverage_cleanup.rs:14:8: 14:36 (#0);
       coverage Code { bcb: bcb3 } => $DIR/instrument_coverage_cleanup.rs:14:37: 14:39 (#0);
-      coverage Code { bcb: bcb1 } => $DIR/instrument_coverage_cleanup.rs:14:39: 14:39 (#0);
-      coverage Code { bcb: bcb2 } => $DIR/instrument_coverage_cleanup.rs:15:2: 15:2 (#0);
+      coverage Code { bcb: bcb1 } => $DIR/instrument_coverage_cleanup.rs:14:38: 14:39 (#0);
+      coverage Code { bcb: bcb2 } => $DIR/instrument_coverage_cleanup.rs:15:1: 15:2 (#0);
       coverage Branch { true_bcb: bcb3, false_bcb: bcb1 } => $DIR/instrument_coverage_cleanup.rs:14:8: 14:36 (#0);
   
       bb0: {
diff --git a/tests/mir-opt/coverage/instrument_coverage_cleanup.main.InstrumentCoverage.diff b/tests/mir-opt/coverage/instrument_coverage_cleanup.main.InstrumentCoverage.diff
index 239b845c2311e..0c1bc24b6dc19 100644
--- a/tests/mir-opt/coverage/instrument_coverage_cleanup.main.InstrumentCoverage.diff
+++ b/tests/mir-opt/coverage/instrument_coverage_cleanup.main.InstrumentCoverage.diff
@@ -10,8 +10,8 @@
 +     coverage Code { bcb: bcb0 } => $DIR/instrument_coverage_cleanup.rs:13:1: 13:10 (#0);
 +     coverage Code { bcb: bcb0 } => $DIR/instrument_coverage_cleanup.rs:14:8: 14:36 (#0);
 +     coverage Code { bcb: bcb3 } => $DIR/instrument_coverage_cleanup.rs:14:37: 14:39 (#0);
-+     coverage Code { bcb: bcb1 } => $DIR/instrument_coverage_cleanup.rs:14:39: 14:39 (#0);
-+     coverage Code { bcb: bcb2 } => $DIR/instrument_coverage_cleanup.rs:15:2: 15:2 (#0);
++     coverage Code { bcb: bcb1 } => $DIR/instrument_coverage_cleanup.rs:14:38: 14:39 (#0);
++     coverage Code { bcb: bcb2 } => $DIR/instrument_coverage_cleanup.rs:15:1: 15:2 (#0);
 +     coverage Branch { true_bcb: bcb3, false_bcb: bcb1 } => $DIR/instrument_coverage_cleanup.rs:14:8: 14:36 (#0);
 + 
       bb0: {

From 2832517ba174906b6d6ebedf4893dca8d8a98f55 Mon Sep 17 00:00:00 2001
From: xizheyin <xizheyin@smail.nju.edu.cn>
Date: Mon, 21 Jul 2025 11:05:37 +0800
Subject: [PATCH 08/11] Clean code for `rustc_parse/src/lexer`

1. Rename `make_unclosed_delims_error` and return `Vec<Diag>`
2. change magic number `unclosed_delimiter_show_limit` to const
3. move `eof_err` below parsing logic
4. Add `calculate_spacing` for `bump` and `bump_minimal`

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
---
 compiler/rustc_parse/src/lexer/diagnostics.rs |  44 ++++----
 compiler/rustc_parse/src/lexer/mod.rs         |  18 ++-
 compiler/rustc_parse/src/lexer/tokentrees.rs  | 106 +++++++++---------
 3 files changed, 83 insertions(+), 85 deletions(-)

diff --git a/compiler/rustc_parse/src/lexer/diagnostics.rs b/compiler/rustc_parse/src/lexer/diagnostics.rs
index 6de001fc9985a..947f3df179ffa 100644
--- a/compiler/rustc_parse/src/lexer/diagnostics.rs
+++ b/compiler/rustc_parse/src/lexer/diagnostics.rs
@@ -126,23 +126,29 @@ pub(super) fn report_suspicious_mismatch_block(
     }
 }
 
-pub(crate) fn make_unclosed_delims_error(
-    unmatched: UnmatchedDelim,
-    psess: &ParseSess,
-) -> Option<Diag<'_>> {
-    // `None` here means an `Eof` was found. We already emit those errors elsewhere, we add them to
-    // `unmatched_delims` only for error recovery in the `Parser`.
-    let found_delim = unmatched.found_delim?;
-    let mut spans = vec![unmatched.found_span];
-    if let Some(sp) = unmatched.unclosed_span {
-        spans.push(sp);
-    };
-    let err = psess.dcx().create_err(MismatchedClosingDelimiter {
-        spans,
-        delimiter: pprust::token_kind_to_string(&found_delim.as_close_token_kind()).to_string(),
-        unmatched: unmatched.found_span,
-        opening_candidate: unmatched.candidate_span,
-        unclosed: unmatched.unclosed_span,
-    });
-    Some(err)
+pub(crate) fn make_errors_for_mismatched_closing_delims<'psess>(
+    unmatcheds: &[UnmatchedDelim],
+    psess: &'psess ParseSess,
+) -> Vec<Diag<'psess>> {
+    unmatcheds
+        .iter()
+        .filter_map(|unmatched| {
+            // `None` here means an `Eof` was found. We already emit those errors elsewhere, we add them to
+            // `unmatched_delims` only for error recovery in the `Parser`.
+            let found_delim = unmatched.found_delim?;
+            let mut spans = vec![unmatched.found_span];
+            if let Some(sp) = unmatched.unclosed_span {
+                spans.push(sp);
+            };
+            let err = psess.dcx().create_err(MismatchedClosingDelimiter {
+                spans,
+                delimiter: pprust::token_kind_to_string(&found_delim.as_close_token_kind())
+                    .to_string(),
+                unmatched: unmatched.found_span,
+                opening_candidate: unmatched.candidate_span,
+                unclosed: unmatched.unclosed_span,
+            });
+            Some(err)
+        })
+        .collect()
 }
diff --git a/compiler/rustc_parse/src/lexer/mod.rs b/compiler/rustc_parse/src/lexer/mod.rs
index 60d275bf2b402..85af5a615aef2 100644
--- a/compiler/rustc_parse/src/lexer/mod.rs
+++ b/compiler/rustc_parse/src/lexer/mod.rs
@@ -1,4 +1,4 @@
-use diagnostics::make_unclosed_delims_error;
+use diagnostics::make_errors_for_mismatched_closing_delims;
 use rustc_ast::ast::{self, AttrStyle};
 use rustc_ast::token::{self, CommentKind, Delimiter, IdentIsRaw, Token, TokenKind};
 use rustc_ast::tokenstream::TokenStream;
@@ -71,27 +71,23 @@ pub(crate) fn lex_token_trees<'psess, 'src>(
     };
     let res = lexer.lex_token_trees(/* is_delimited */ false);
 
-    let mut unmatched_delims: Vec<_> = lexer
-        .diag_info
-        .unmatched_delims
-        .into_iter()
-        .filter_map(|unmatched_delim| make_unclosed_delims_error(unmatched_delim, psess))
-        .collect();
+    let mut unmatched_closing_delims: Vec<_> =
+        make_errors_for_mismatched_closing_delims(&lexer.diag_info.unmatched_delims, psess);
 
     match res {
         Ok((_open_spacing, stream)) => {
-            if unmatched_delims.is_empty() {
+            if unmatched_closing_delims.is_empty() {
                 Ok(stream)
             } else {
                 // Return error if there are unmatched delimiters or unclosed delimiters.
-                Err(unmatched_delims)
+                Err(unmatched_closing_delims)
             }
         }
         Err(errs) => {
             // We emit delimiter mismatch errors first, then emit the unclosing delimiter mismatch
             // because the delimiter mismatch is more likely to be the root cause of error
-            unmatched_delims.extend(errs);
-            Err(unmatched_delims)
+            unmatched_closing_delims.extend(errs);
+            Err(unmatched_closing_delims)
         }
     }
 }
diff --git a/compiler/rustc_parse/src/lexer/tokentrees.rs b/compiler/rustc_parse/src/lexer/tokentrees.rs
index 64748199f28d1..634f4c30b2604 100644
--- a/compiler/rustc_parse/src/lexer/tokentrees.rs
+++ b/compiler/rustc_parse/src/lexer/tokentrees.rs
@@ -51,45 +51,6 @@ impl<'psess, 'src> Lexer<'psess, 'src> {
         }
     }
 
-    fn eof_err(&mut self) -> Diag<'psess> {
-        let msg = "this file contains an unclosed delimiter";
-        let mut err = self.dcx().struct_span_err(self.token.span, msg);
-
-        let unclosed_delimiter_show_limit = 5;
-        let len = usize::min(unclosed_delimiter_show_limit, self.diag_info.open_delimiters.len());
-        for &(_, span) in &self.diag_info.open_delimiters[..len] {
-            err.span_label(span, "unclosed delimiter");
-            self.diag_info.unmatched_delims.push(UnmatchedDelim {
-                found_delim: None,
-                found_span: self.token.span,
-                unclosed_span: Some(span),
-                candidate_span: None,
-            });
-        }
-
-        if let Some((_, span)) = self.diag_info.open_delimiters.get(unclosed_delimiter_show_limit)
-            && self.diag_info.open_delimiters.len() >= unclosed_delimiter_show_limit + 2
-        {
-            err.span_label(
-                *span,
-                format!(
-                    "another {} unclosed delimiters begin from here",
-                    self.diag_info.open_delimiters.len() - unclosed_delimiter_show_limit
-                ),
-            );
-        }
-
-        if let Some((delim, _)) = self.diag_info.open_delimiters.last() {
-            report_suspicious_mismatch_block(
-                &mut err,
-                &self.diag_info,
-                self.psess.source_map(),
-                *delim,
-            )
-        }
-        err
-    }
-
     fn lex_token_tree_open_delim(
         &mut self,
         open_delim: Delimiter,
@@ -206,13 +167,7 @@ impl<'psess, 'src> Lexer<'psess, 'src> {
             } else if let Some(glued) = self.token.glue(&next_tok) {
                 self.token = glued;
             } else {
-                let this_spacing = if next_tok.is_punct() {
-                    Spacing::Joint
-                } else if next_tok == token::Eof {
-                    Spacing::Alone
-                } else {
-                    Spacing::JointHidden
-                };
+                let this_spacing = self.calculate_spacing(&next_tok);
                 break (this_spacing, next_tok);
             }
         };
@@ -223,23 +178,64 @@ impl<'psess, 'src> Lexer<'psess, 'src> {
     // Cut-down version of `bump` used when the token kind is known in advance.
     fn bump_minimal(&mut self) -> Spacing {
         let (next_tok, is_next_tok_preceded_by_whitespace) = self.next_token_from_cursor();
-
         let this_spacing = if is_next_tok_preceded_by_whitespace {
             Spacing::Alone
         } else {
-            if next_tok.is_punct() {
-                Spacing::Joint
-            } else if next_tok == token::Eof {
-                Spacing::Alone
-            } else {
-                Spacing::JointHidden
-            }
+            self.calculate_spacing(&next_tok)
         };
-
         self.token = next_tok;
         this_spacing
     }
 
+    fn calculate_spacing(&self, next_tok: &Token) -> Spacing {
+        if next_tok.is_punct() {
+            Spacing::Joint
+        } else if *next_tok == token::Eof {
+            Spacing::Alone
+        } else {
+            Spacing::JointHidden
+        }
+    }
+
+    fn eof_err(&mut self) -> Diag<'psess> {
+        const UNCLOSED_DELIMITER_SHOW_LIMIT: usize = 5;
+        let msg = "this file contains an unclosed delimiter";
+        let mut err = self.dcx().struct_span_err(self.token.span, msg);
+
+        let len = usize::min(UNCLOSED_DELIMITER_SHOW_LIMIT, self.diag_info.open_delimiters.len());
+        for &(_, span) in &self.diag_info.open_delimiters[..len] {
+            err.span_label(span, "unclosed delimiter");
+            self.diag_info.unmatched_delims.push(UnmatchedDelim {
+                found_delim: None,
+                found_span: self.token.span,
+                unclosed_span: Some(span),
+                candidate_span: None,
+            });
+        }
+
+        if let Some((_, span)) = self.diag_info.open_delimiters.get(UNCLOSED_DELIMITER_SHOW_LIMIT)
+            && self.diag_info.open_delimiters.len() >= UNCLOSED_DELIMITER_SHOW_LIMIT + 2
+        {
+            err.span_label(
+                *span,
+                format!(
+                    "another {} unclosed delimiters begin from here",
+                    self.diag_info.open_delimiters.len() - UNCLOSED_DELIMITER_SHOW_LIMIT
+                ),
+            );
+        }
+
+        if let Some((delim, _)) = self.diag_info.open_delimiters.last() {
+            report_suspicious_mismatch_block(
+                &mut err,
+                &self.diag_info,
+                self.psess.source_map(),
+                *delim,
+            )
+        }
+        err
+    }
+
     fn close_delim_err(&mut self, delim: Delimiter) -> Diag<'psess> {
         // An unexpected closing delimiter (i.e., there is no matching opening delimiter).
         let token_str = token_to_string(&self.token);

From f5a33e88970ef3863a373682b72b533b0648ad63 Mon Sep 17 00:00:00 2001
From: Jens Reidel <adrian@travitia.xyz>
Date: Tue, 22 Jul 2025 17:31:47 +0200
Subject: [PATCH 09/11] Add powerpc64le-unknown-linux-musl to CI rustc targets

I missed this in the promotion to tier 2 with host tools.

Signed-off-by: Jens Reidel <adrian@travitia.xyz>
---
 src/bootstrap/src/core/download.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/bootstrap/src/core/download.rs b/src/bootstrap/src/core/download.rs
index d7c6d8dbcc3f9..373fcd52052e0 100644
--- a/src/bootstrap/src/core/download.rs
+++ b/src/bootstrap/src/core/download.rs
@@ -875,6 +875,7 @@ pub(crate) fn is_download_ci_available(target_triple: &str, llvm_assertions: boo
         "powerpc-unknown-linux-gnu",
         "powerpc64-unknown-linux-gnu",
         "powerpc64le-unknown-linux-gnu",
+        "powerpc64le-unknown-linux-musl",
         "riscv64gc-unknown-linux-gnu",
         "s390x-unknown-linux-gnu",
         "x86_64-apple-darwin",

From 25bbaf0d5cb212d2d163c244a3ead678bd93f462 Mon Sep 17 00:00:00 2001
From: binarycat <binarycat@envs.net>
Date: Tue, 22 Jul 2025 11:58:34 -0500
Subject: [PATCH 10/11] bootstrap: add package.json and package-lock.json to
 dist tarball

this ensures that js-related tests can still be run from within
such a dist tarball.
---
 src/bootstrap/src/core/build_steps/dist.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/bootstrap/src/core/build_steps/dist.rs b/src/bootstrap/src/core/build_steps/dist.rs
index 39e4fb2ac01ed..c8a54ad250cb3 100644
--- a/src/bootstrap/src/core/build_steps/dist.rs
+++ b/src/bootstrap/src/core/build_steps/dist.rs
@@ -1068,6 +1068,8 @@ impl Step for PlainSourceTarball {
             "bootstrap.example.toml",
             "configure",
             "license-metadata.json",
+            "package-lock.json",
+            "package.json",
             "x",
             "x.ps1",
             "x.py",

From a9fd8d041bf40b0b2425ad79062d09a441352efa Mon Sep 17 00:00:00 2001
From: Jens Reidel <adrian@travitia.xyz>
Date: Tue, 22 Jul 2025 19:00:32 +0200
Subject: [PATCH 11/11] bootstrap: Move musl-root fallback out of sanity check

Previously, the musl root would only be set to the fallback /usr by
the sanity check, which isn't ran for the bootstrap tests.

Signed-off-by: Jens Reidel <adrian@travitia.xyz>
---
 src/bootstrap/src/core/sanity.rs |  6 ------
 src/bootstrap/src/lib.rs         | 26 ++++++++++++++++++--------
 2 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/src/bootstrap/src/core/sanity.rs b/src/bootstrap/src/core/sanity.rs
index b39d464493e56..15e04f591296c 100644
--- a/src/bootstrap/src/core/sanity.rs
+++ b/src/bootstrap/src/core/sanity.rs
@@ -338,12 +338,6 @@ than building it.
 
         // Make sure musl-root is valid.
         if target.contains("musl") && !target.contains("unikraft") {
-            // If this is a native target (host is also musl) and no musl-root is given,
-            // fall back to the system toolchain in /usr before giving up
-            if build.musl_root(*target).is_none() && build.config.is_host_target(*target) {
-                let target = build.config.target_config.entry(*target).or_default();
-                target.musl_root = Some("/usr".into());
-            }
             match build.musl_libdir(*target) {
                 Some(libdir) => {
                     if fs::metadata(libdir.join("libc.a")).is_err() {
diff --git a/src/bootstrap/src/lib.rs b/src/bootstrap/src/lib.rs
index 63aab4d116a93..2aee9f0728449 100644
--- a/src/bootstrap/src/lib.rs
+++ b/src/bootstrap/src/lib.rs
@@ -1329,23 +1329,33 @@ impl Build {
         }
     }
 
-    /// Returns the "musl root" for this `target`, if defined
+    /// Returns the "musl root" for this `target`, if defined.
+    ///
+    /// If this is a native target (host is also musl) and no musl-root is given,
+    /// it falls back to the system toolchain in /usr.
     fn musl_root(&self, target: TargetSelection) -> Option<&Path> {
-        self.config
+        let configured_root = self
+            .config
             .target_config
             .get(&target)
             .and_then(|t| t.musl_root.as_ref())
             .or(self.config.musl_root.as_ref())
-            .map(|p| &**p)
+            .map(|p| &**p);
+
+        if self.config.is_host_target(target) && configured_root.is_none() {
+            return Some(Path::new("/usr"));
+        } else {
+            configured_root
+        }
     }
 
     /// Returns the "musl libdir" for this `target`.
     fn musl_libdir(&self, target: TargetSelection) -> Option<PathBuf> {
-        let t = self.config.target_config.get(&target)?;
-        if let libdir @ Some(_) = &t.musl_libdir {
-            return libdir.clone();
-        }
-        self.musl_root(target).map(|root| root.join("lib"))
+        self.config
+            .target_config
+            .get(&target)
+            .and_then(|t| t.musl_libdir.clone())
+            .or_else(|| self.musl_root(target).map(|root| root.join("lib")))
     }
 
     /// Returns the `lib` directory for the WASI target specified, if