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_const_eval/src/interpret/memory.rs b/compiler/rustc_const_eval/src/interpret/memory.rs
index 34297a6164823..47bebf5371a9a 100644
--- a/compiler/rustc_const_eval/src/interpret/memory.rs
+++ b/compiler/rustc_const_eval/src/interpret/memory.rs
@@ -1000,7 +1000,7 @@ 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/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_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/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);
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,
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
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() };
 }
 
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",
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",
diff --git a/src/librustdoc/html/render/search_index.rs b/src/librustdoc/html/render/search_index.rs
index 3c9be29ccc359..e2f86b8a8549e 100644
--- a/src/librustdoc/html/render/search_index.rs
+++ b/src/librustdoc/html/render/search_index.rs
@@ -100,9 +100,22 @@ pub(crate) fn build_index(
     let crate_doc =
         short_markdown_summary(&krate.module.doc_value(), &krate.module.link_names(cache));
 
+    #[derive(Eq, Ord, PartialEq, PartialOrd)]
+    struct SerSymbolAsStr(Symbol);
+
+    impl Serialize for SerSymbolAsStr {
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+        {
+            self.0.as_str().serialize(serializer)
+        }
+    }
+
+    type AliasMap = BTreeMap<SerSymbolAsStr, Vec<usize>>;
     // Aliases added through `#[doc(alias = "...")]`. Since a few items can have the same alias,
     // we need the alias element to have an array of items.
-    let mut aliases: BTreeMap<String, Vec<usize>> = BTreeMap::new();
+    let mut aliases: AliasMap = BTreeMap::new();
 
     // Sort search index items. This improves the compressibility of the search index.
     cache.search_index.sort_unstable_by(|k1, k2| {
@@ -116,7 +129,7 @@ pub(crate) fn build_index(
     // Set up alias indexes.
     for (i, item) in cache.search_index.iter().enumerate() {
         for alias in &item.aliases[..] {
-            aliases.entry(alias.to_string()).or_default().push(i);
+            aliases.entry(SerSymbolAsStr(*alias)).or_default().push(i);
         }
     }
 
@@ -474,7 +487,7 @@ pub(crate) fn build_index(
         // The String is alias name and the vec is the list of the elements with this alias.
         //
         // To be noted: the `usize` elements are indexes to `items`.
-        aliases: &'a BTreeMap<String, Vec<usize>>,
+        aliases: &'a AliasMap,
         // Used when a type has more than one impl with an associated item with the same name.
         associated_item_disambiguators: &'a Vec<(usize, String)>,
         // A list of shard lengths encoded as vlqhex. See the comment in write_vlqhex_to_string
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
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-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/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: {
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
 
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`.
diff --git a/tests/ui/privacy/sealed-traits/false-sealed-traits-note.rs b/tests/ui/privacy/sealed-traits/false-sealed-traits-note.rs
index 13f3065e442e5..d5065a6b55b2f 100644
--- a/tests/ui/privacy/sealed-traits/false-sealed-traits-note.rs
+++ b/tests/ui/privacy/sealed-traits/false-sealed-traits-note.rs
@@ -1,5 +1,6 @@
-// We should not emit sealed traits note, see issue #143392
+// We should not emit sealed traits note, see issue #143392 and #143121
 
+/// Reported in #143392
 mod inner {
     pub trait TraitA {}
 
@@ -10,4 +11,13 @@ struct Struct;
 
 impl inner::TraitB for Struct {} //~ ERROR the trait bound `Struct: TraitA` is not satisfied [E0277]
 
+/// Reported in #143121
+mod x {
+    pub trait A {}
+    pub trait B: A {}
+
+    pub struct C;
+    impl B for C {} //~ ERROR the trait bound `C: A` is not satisfied [E0277]
+}
+
 fn main(){}
diff --git a/tests/ui/privacy/sealed-traits/false-sealed-traits-note.stderr b/tests/ui/privacy/sealed-traits/false-sealed-traits-note.stderr
index f80d985ad6e63..df8016565da47 100644
--- a/tests/ui/privacy/sealed-traits/false-sealed-traits-note.stderr
+++ b/tests/ui/privacy/sealed-traits/false-sealed-traits-note.stderr
@@ -1,20 +1,37 @@
 error[E0277]: the trait bound `Struct: TraitA` is not satisfied
-  --> $DIR/false-sealed-traits-note.rs:11:24
+  --> $DIR/false-sealed-traits-note.rs:12:24
    |
 LL | impl inner::TraitB for Struct {}
    |                        ^^^^^^ the trait `TraitA` is not implemented for `Struct`
    |
 help: this trait has no implementations, consider adding one
-  --> $DIR/false-sealed-traits-note.rs:4:5
+  --> $DIR/false-sealed-traits-note.rs:5:5
    |
 LL |     pub trait TraitA {}
    |     ^^^^^^^^^^^^^^^^
 note: required by a bound in `TraitB`
-  --> $DIR/false-sealed-traits-note.rs:6:23
+  --> $DIR/false-sealed-traits-note.rs:7:23
    |
 LL |     pub trait TraitB: TraitA {}
    |                       ^^^^^^ required by this bound in `TraitB`
 
-error: aborting due to 1 previous error
+error[E0277]: the trait bound `C: A` is not satisfied
+  --> $DIR/false-sealed-traits-note.rs:20:16
+   |
+LL |     impl B for C {}
+   |                ^ the trait `A` is not implemented for `C`
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/false-sealed-traits-note.rs:16:5
+   |
+LL |     pub trait A {}
+   |     ^^^^^^^^^^^
+note: required by a bound in `B`
+  --> $DIR/false-sealed-traits-note.rs:17:18
+   |
+LL |     pub trait B: A {}
+   |                  ^ required by this bound in `B`
+
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0277`.
diff --git a/triagebot.toml b/triagebot.toml
index 162e244c0addf..5b522a6617cdc 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"]