Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

9 files changed, 449 insertions, 98 deletions

diff --git a/compiler/rustc_session/Cargo.toml b/compiler/rustc_session/Cargo.toml
index 6b1eaa4d3..cbbba2252 100644
--- a/compiler/rustc_session/Cargo.toml
+++ b/compiler/rustc_session/Cargo.toml
@@ -17,3 +17,11 @@ rustc_span = { path = "../rustc_span" }
 rustc_fs_util = { path = "../rustc_fs_util" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_lint_defs = { path = "../rustc_lint_defs" }
+smallvec = "1.8.1"
+termize = "0.1.1"
+
+[target.'cfg(unix)'.dependencies]
+libc = "0.2"
+
+[target.'cfg(windows)'.dependencies]
+winapi = { version = "0.3", features = ["libloaderapi"] }
diff --git a/compiler/rustc_session/src/cgu_reuse_tracker.rs b/compiler/rustc_session/src/cgu_reuse_tracker.rs
index 2336d9936..8703e5754 100644
--- a/compiler/rustc_session/src/cgu_reuse_tracker.rs
+++ b/compiler/rustc_session/src/cgu_reuse_tracker.rs
@@ -121,7 +121,7 @@ impl CguReuseTracker {
                         let at_least = if at_least { 1 } else { 0 };
                         IncorrectCguReuseType {
                             span: error_span.0,
-                            cgu_user_name: &cgu_user_name,
+                            cgu_user_name,
                             actual_reuse,
                             expected_reuse,
                             at_least,
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index f2ee52262..7a20100fd 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -10,8 +10,8 @@ use crate::{lint, HashStableContext};
 
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 
-use rustc_data_structures::stable_hasher::ToStableHashKey;
-use rustc_target::abi::{Align, TargetDataLayout};
+use rustc_data_structures::stable_hasher::{StableOrd, ToStableHashKey};
+use rustc_target::abi::Align;
 use rustc_target::spec::{PanicStrategy, SanitizerSet, SplitDebuginfo};
 use rustc_target::spec::{Target, TargetTriple, TargetWarnings, TARGETS};
 
@@ -288,6 +288,9 @@ pub enum OutputType {
     DepInfo,
 }
 
+// Safety: Trivial C-Style enums have a stable sort order across compilation sessions.
+unsafe impl StableOrd for OutputType {}
+
 impl<HCX: HashStableContext> ToStableHashKey<HCX> for OutputType {
     type KeyType = Self;
 
@@ -548,6 +551,7 @@ pub enum PrintRequest {
     NativeStaticLibs,
     StackProtectorStrategies,
     LinkArgs,
+    SplitDebuginfo,
 }
 
 pub enum Input {
@@ -621,7 +625,7 @@ impl OutputFilenames {
     /// should be placed on disk.
     pub fn output_path(&self, flavor: OutputType) -> PathBuf {
         let extension = flavor.extension();
-        self.with_directory_and_extension(&self.out_directory, &extension)
+        self.with_directory_and_extension(&self.out_directory, extension)
     }
 
     /// Gets the path where a compilation artifact of the given type for the
@@ -658,7 +662,7 @@ impl OutputFilenames {
 
         let temps_directory = self.temps_directory.as_ref().unwrap_or(&self.out_directory);
 
-        self.with_directory_and_extension(&temps_directory, &extension)
+        self.with_directory_and_extension(temps_directory, &extension)
     }
 
     pub fn with_extension(&self, extension: &str) -> PathBuf {
@@ -738,7 +742,7 @@ impl Default for Options {
             actually_rustdoc: false,
             trimmed_def_paths: TrimmedDefPaths::default(),
             cli_forced_codegen_units: None,
-            cli_forced_thinlto_off: false,
+            cli_forced_local_thinlto_off: false,
             remap_path_prefix: Vec::new(),
             real_rust_source_base_dir: None,
             edition: DEFAULT_EDITION,
@@ -794,6 +798,7 @@ impl UnstableOptions {
             report_delayed_bugs: self.report_delayed_bugs,
             macro_backtrace: self.macro_backtrace,
             deduplicate_diagnostics: self.deduplicate_diagnostics,
+            track_diagnostics: self.track_diagnostics,
         }
     }
 }
@@ -898,7 +903,7 @@ fn default_configuration(sess: &Session) -> CrateConfig {
     let min_atomic_width = sess.target.min_atomic_width();
     let max_atomic_width = sess.target.max_atomic_width();
     let atomic_cas = sess.target.atomic_cas;
-    let layout = TargetDataLayout::parse(&sess.target).unwrap_or_else(|err| {
+    let layout = sess.target.parse_data_layout().unwrap_or_else(|err| {
         sess.emit_fatal(err);
     });
 
@@ -1157,7 +1162,7 @@ impl CrateCheckConfig {
                 values_target_family
                     .extend(target.options.families.iter().map(|family| Symbol::intern(family)));
                 values_target_arch.insert(Symbol::intern(&target.arch));
-                values_target_endian.insert(Symbol::intern(&target.options.endian.as_str()));
+                values_target_endian.insert(Symbol::intern(target.options.endian.as_str()));
                 values_target_env.insert(Symbol::intern(&target.options.env));
                 values_target_abi.insert(Symbol::intern(&target.options.abi));
                 values_target_vendor.insert(Symbol::intern(&target.options.vendor));
@@ -1478,7 +1483,7 @@ pub fn get_cmd_lint_options(
 
 /// Parses the `--color` flag.
 pub fn parse_color(matches: &getopts::Matches) -> ColorConfig {
-    match matches.opt_str("color").as_ref().map(|s| &s[..]) {
+    match matches.opt_str("color").as_deref() {
         Some("auto") => ColorConfig::Auto,
         Some("always") => ColorConfig::Always,
         Some("never") => ColorConfig::Never,
@@ -1587,7 +1592,7 @@ pub fn parse_error_format(
     // is unstable, it will not be present. We have to use `opts_present` not
     // `opt_present` because the latter will panic.
     let error_format = if matches.opts_present(&["error-format".to_owned()]) {
-        match matches.opt_str("error-format").as_ref().map(|s| &s[..]) {
+        match matches.opt_str("error-format").as_deref() {
             None | Some("human") => {
                 ErrorOutputType::HumanReadable(HumanReadableErrorType::Default(color))
             }
@@ -1720,7 +1725,7 @@ fn should_override_cgus_and_disable_thinlto(
     error_format: ErrorOutputType,
     mut codegen_units: Option<usize>,
 ) -> (bool, Option<usize>) {
-    let mut disable_thinlto = false;
+    let mut disable_local_thinlto = false;
     // Issue #30063: if user requests LLVM-related output to one
     // particular path, disable codegen-units.
     let incompatible: Vec<_> = output_types
@@ -1745,12 +1750,12 @@ fn should_override_cgus_and_disable_thinlto(
                     }
                     early_warn(error_format, "resetting to default -C codegen-units=1");
                     codegen_units = Some(1);
-                    disable_thinlto = true;
+                    disable_local_thinlto = true;
                 }
             }
             _ => {
                 codegen_units = Some(1);
-                disable_thinlto = true;
+                disable_local_thinlto = true;
             }
         }
     }
@@ -1759,7 +1764,7 @@ fn should_override_cgus_and_disable_thinlto(
         early_error(error_format, "value for codegen units must be a positive non-zero integer");
     }
 
-    (disable_thinlto, codegen_units)
+    (disable_local_thinlto, codegen_units)
 }
 
 fn check_thread_count(unstable_opts: &UnstableOptions, error_format: ErrorOutputType) {
@@ -1788,34 +1793,50 @@ fn collect_print_requests(
         cg.target_feature = String::new();
     }
 
-    prints.extend(matches.opt_strs("print").into_iter().map(|s| match &*s {
-        "crate-name" => PrintRequest::CrateName,
-        "file-names" => PrintRequest::FileNames,
-        "sysroot" => PrintRequest::Sysroot,
-        "target-libdir" => PrintRequest::TargetLibdir,
-        "cfg" => PrintRequest::Cfg,
-        "calling-conventions" => PrintRequest::CallingConventions,
-        "target-list" => PrintRequest::TargetList,
-        "target-cpus" => PrintRequest::TargetCPUs,
-        "target-features" => PrintRequest::TargetFeatures,
-        "relocation-models" => PrintRequest::RelocationModels,
-        "code-models" => PrintRequest::CodeModels,
-        "tls-models" => PrintRequest::TlsModels,
-        "native-static-libs" => PrintRequest::NativeStaticLibs,
-        "stack-protector-strategies" => PrintRequest::StackProtectorStrategies,
-        "target-spec-json" => {
-            if unstable_opts.unstable_options {
-                PrintRequest::TargetSpec
-            } else {
+    const PRINT_REQUESTS: &[(&str, PrintRequest)] = &[
+        ("crate-name", PrintRequest::CrateName),
+        ("file-names", PrintRequest::FileNames),
+        ("sysroot", PrintRequest::Sysroot),
+        ("target-libdir", PrintRequest::TargetLibdir),
+        ("cfg", PrintRequest::Cfg),
+        ("calling-conventions", PrintRequest::CallingConventions),
+        ("target-list", PrintRequest::TargetList),
+        ("target-cpus", PrintRequest::TargetCPUs),
+        ("target-features", PrintRequest::TargetFeatures),
+        ("relocation-models", PrintRequest::RelocationModels),
+        ("code-models", PrintRequest::CodeModels),
+        ("tls-models", PrintRequest::TlsModels),
+        ("native-static-libs", PrintRequest::NativeStaticLibs),
+        ("stack-protector-strategies", PrintRequest::StackProtectorStrategies),
+        ("target-spec-json", PrintRequest::TargetSpec),
+        ("link-args", PrintRequest::LinkArgs),
+        ("split-debuginfo", PrintRequest::SplitDebuginfo),
+    ];
+
+    prints.extend(matches.opt_strs("print").into_iter().map(|req| {
+        match PRINT_REQUESTS.iter().find(|&&(name, _)| name == req) {
+            Some((_, PrintRequest::TargetSpec)) => {
+                if unstable_opts.unstable_options {
+                    PrintRequest::TargetSpec
+                } else {
+                    early_error(
+                        error_format,
+                        "the `-Z unstable-options` flag must also be passed to \
+                     enable the target-spec-json print option",
+                    );
+                }
+            }
+            Some(&(_, print_request)) => print_request,
+            None => {
+                let prints =
+                    PRINT_REQUESTS.iter().map(|(name, _)| format!("`{name}`")).collect::<Vec<_>>();
+                let prints = prints.join(", ");
                 early_error(
                     error_format,
-                    "the `-Z unstable-options` flag must also be passed to \
-                     enable the target-spec-json print option",
+                    &format!("unknown print request `{req}`. Valid print requests are: {prints}"),
                 );
             }
         }
-        "link-args" => PrintRequest::LinkArgs,
-        req => early_error(error_format, &format!("unknown print request `{req}`")),
     }));
 
     prints
@@ -1828,7 +1849,7 @@ pub fn parse_target_triple(
     match matches.opt_str("target") {
         Some(target) if target.ends_with(".json") => {
             let path = Path::new(&target);
-            TargetTriple::from_path(&path).unwrap_or_else(|_| {
+            TargetTriple::from_path(path).unwrap_or_else(|_| {
                 early_error(error_format, &format!("target file {path:?} does not exist"))
             })
         }
@@ -1974,7 +1995,7 @@ fn parse_native_lib_modifiers(
 ) -> (NativeLibKind, Option<bool>) {
     let mut verbatim = None;
     for modifier in modifiers.split(',') {
-        let (modifier, value) = match modifier.strip_prefix(&['+', '-']) {
+        let (modifier, value) = match modifier.strip_prefix(['+', '-']) {
             Some(m) => (m, modifier.starts_with('+')),
             None => early_error(
                 error_format,
@@ -2011,10 +2032,7 @@ fn parse_native_lib_modifiers(
                 "linking modifier `bundle` is only compatible with `static` linking kind",
             ),
 
-            ("verbatim", _) => {
-                report_unstable_modifier();
-                assign_modifier(&mut verbatim)
-            }
+            ("verbatim", _) => assign_modifier(&mut verbatim),
 
             ("whole-archive", NativeLibKind::Static { whole_archive, .. }) => {
                 assign_modifier(whole_archive)
@@ -2249,7 +2267,7 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
     let output_types = parse_output_types(&unstable_opts, matches, error_format);
 
     let mut cg = CodegenOptions::build(matches, error_format);
-    let (disable_thinlto, mut codegen_units) = should_override_cgus_and_disable_thinlto(
+    let (disable_local_thinlto, mut codegen_units) = should_override_cgus_and_disable_thinlto(
         &output_types,
         matches,
         error_format,
@@ -2406,7 +2424,7 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
 
     let mut search_paths = vec![];
     for s in &matches.opt_strs("L") {
-        search_paths.push(SearchPath::from_cli_opt(&s, error_format));
+        search_paths.push(SearchPath::from_cli_opt(s, error_format));
     }
 
     let libs = parse_libs(matches, error_format);
@@ -2431,7 +2449,7 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
     let sysroot = match &sysroot_opt {
         Some(s) => s,
         None => {
-            tmp_buf = crate::filesearch::get_or_default_sysroot();
+            tmp_buf = crate::filesearch::get_or_default_sysroot().expect("Failed finding sysroot");
             &tmp_buf
         }
     };
@@ -2492,7 +2510,7 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
         actually_rustdoc: false,
         trimmed_def_paths: TrimmedDefPaths::default(),
         cli_forced_codegen_units: codegen_units,
-        cli_forced_thinlto_off: disable_thinlto,
+        cli_forced_local_thinlto_off: disable_local_thinlto,
         remap_path_prefix,
         real_rust_source_base_dir,
         edition,
diff --git a/compiler/rustc_session/src/errors.rs b/compiler/rustc_session/src/errors.rs
index bf542faec..ee492f802 100644
--- a/compiler/rustc_session/src/errors.rs
+++ b/compiler/rustc_session/src/errors.rs
@@ -1,6 +1,9 @@
 use std::num::NonZeroU32;
 
 use crate::cgu_reuse_tracker::CguReuse;
+use crate::parse::ParseSess;
+use rustc_ast::token;
+use rustc_ast::util::literal::LitError;
 use rustc_errors::MultiSpan;
 use rustc_macros::Diagnostic;
 use rustc_span::{Span, Symbol};
@@ -126,10 +129,10 @@ pub struct FileIsNotWriteable<'a> {
 
 #[derive(Diagnostic)]
 #[diag(session_crate_name_does_not_match)]
-pub struct CrateNameDoesNotMatch<'a> {
+pub struct CrateNameDoesNotMatch {
     #[primary_span]
     pub span: Span,
-    pub s: &'a str,
+    pub s: Symbol,
     pub name: Symbol,
 }
 
@@ -148,11 +151,11 @@ pub struct CrateNameEmpty {
 
 #[derive(Diagnostic)]
 #[diag(session_invalid_character_in_create_name)]
-pub struct InvalidCharacterInCrateName<'a> {
+pub struct InvalidCharacterInCrateName {
     #[primary_span]
     pub span: Option<Span>,
     pub character: char,
-    pub crate_name: &'a str,
+    pub crate_name: Symbol,
 }
 
 #[derive(Subdiagnostic)]
@@ -191,3 +194,158 @@ pub enum UnleashedFeatureHelp {
         span: Span,
     },
 }
+
+#[derive(Diagnostic)]
+#[diag(session_invalid_literal_suffix)]
+pub(crate) struct InvalidLiteralSuffix<'a> {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    // FIXME(#100717)
+    pub kind: &'a str,
+    pub suffix: Symbol,
+}
+
+#[derive(Diagnostic)]
+#[diag(session_invalid_int_literal_width)]
+#[help]
+pub(crate) struct InvalidIntLiteralWidth {
+    #[primary_span]
+    pub span: Span,
+    pub width: String,
+}
+
+#[derive(Diagnostic)]
+#[diag(session_invalid_num_literal_base_prefix)]
+#[note]
+pub(crate) struct InvalidNumLiteralBasePrefix {
+    #[primary_span]
+    #[suggestion(applicability = "maybe-incorrect", code = "{fixed}")]
+    pub span: Span,
+    pub fixed: String,
+}
+
+#[derive(Diagnostic)]
+#[diag(session_invalid_num_literal_suffix)]
+#[help]
+pub(crate) struct InvalidNumLiteralSuffix {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    pub suffix: String,
+}
+
+#[derive(Diagnostic)]
+#[diag(session_invalid_float_literal_width)]
+#[help]
+pub(crate) struct InvalidFloatLiteralWidth {
+    #[primary_span]
+    pub span: Span,
+    pub width: String,
+}
+
+#[derive(Diagnostic)]
+#[diag(session_invalid_float_literal_suffix)]
+#[help]
+pub(crate) struct InvalidFloatLiteralSuffix {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    pub suffix: String,
+}
+
+#[derive(Diagnostic)]
+#[diag(session_int_literal_too_large)]
+pub(crate) struct IntLiteralTooLarge {
+    #[primary_span]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
+#[diag(session_hexadecimal_float_literal_not_supported)]
+pub(crate) struct HexadecimalFloatLiteralNotSupported {
+    #[primary_span]
+    #[label(session_not_supported)]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
+#[diag(session_octal_float_literal_not_supported)]
+pub(crate) struct OctalFloatLiteralNotSupported {
+    #[primary_span]
+    #[label(session_not_supported)]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
+#[diag(session_binary_float_literal_not_supported)]
+pub(crate) struct BinaryFloatLiteralNotSupported {
+    #[primary_span]
+    #[label(session_not_supported)]
+    pub span: Span,
+}
+
+pub fn report_lit_error(sess: &ParseSess, err: LitError, lit: token::Lit, span: Span) {
+    // Checks if `s` looks like i32 or u1234 etc.
+    fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
+        s.len() > 1 && s.starts_with(first_chars) && s[1..].chars().all(|c| c.is_ascii_digit())
+    }
+
+    // Try to lowercase the prefix if it's a valid base prefix.
+    fn fix_base_capitalisation(s: &str) -> Option<String> {
+        if let Some(stripped) = s.strip_prefix('B') {
+            Some(format!("0b{stripped}"))
+        } else if let Some(stripped) = s.strip_prefix('O') {
+            Some(format!("0o{stripped}"))
+        } else if let Some(stripped) = s.strip_prefix('X') {
+            Some(format!("0x{stripped}"))
+        } else {
+            None
+        }
+    }
+
+    let token::Lit { kind, suffix, .. } = lit;
+    match err {
+        // `LexerError` is an error, but it was already reported
+        // by lexer, so here we don't report it the second time.
+        LitError::LexerError => {}
+        LitError::InvalidSuffix => {
+            if let Some(suffix) = suffix {
+                sess.emit_err(InvalidLiteralSuffix { span, kind: kind.descr(), suffix });
+            }
+        }
+        LitError::InvalidIntSuffix => {
+            let suf = suffix.expect("suffix error with no suffix");
+            let suf = suf.as_str();
+            if looks_like_width_suffix(&['i', 'u'], suf) {
+                // If it looks like a width, try to be helpful.
+                sess.emit_err(InvalidIntLiteralWidth { span, width: suf[1..].into() });
+            } else if let Some(fixed) = fix_base_capitalisation(suf) {
+                sess.emit_err(InvalidNumLiteralBasePrefix { span, fixed });
+            } else {
+                sess.emit_err(InvalidNumLiteralSuffix { span, suffix: suf.to_string() });
+            }
+        }
+        LitError::InvalidFloatSuffix => {
+            let suf = suffix.expect("suffix error with no suffix");
+            let suf = suf.as_str();
+            if looks_like_width_suffix(&['f'], suf) {
+                // If it looks like a width, try to be helpful.
+                sess.emit_err(InvalidFloatLiteralWidth { span, width: suf[1..].to_string() });
+            } else {
+                sess.emit_err(InvalidFloatLiteralSuffix { span, suffix: suf.to_string() });
+            }
+        }
+        LitError::NonDecimalFloat(base) => {
+            match base {
+                16 => sess.emit_err(HexadecimalFloatLiteralNotSupported { span }),
+                8 => sess.emit_err(OctalFloatLiteralNotSupported { span }),
+                2 => sess.emit_err(BinaryFloatLiteralNotSupported { span }),
+                _ => unreachable!(),
+            };
+        }
+        LitError::IntTooLarge => {
+            sess.emit_err(IntLiteralTooLarge { span });
+        }
+    }
+}
diff --git a/compiler/rustc_session/src/filesearch.rs b/compiler/rustc_session/src/filesearch.rs
index e8edb38f5..1b66773be 100644
--- a/compiler/rustc_session/src/filesearch.rs
+++ b/compiler/rustc_session/src/filesearch.rs
@@ -1,5 +1,6 @@
 //! A module for searching for libraries
 
+use smallvec::{smallvec, SmallVec};
 use std::env;
 use std::fs;
 use std::iter::FromIterator;
@@ -62,9 +63,99 @@ pub fn make_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
     PathBuf::from_iter([sysroot, Path::new(&rustlib_path), Path::new("lib")])
 }
 
+#[cfg(unix)]
+fn current_dll_path() -> Result<PathBuf, String> {
+    use std::ffi::{CStr, OsStr};
+    use std::os::unix::prelude::*;
+
+    unsafe {
+        let addr = current_dll_path as usize as *mut _;
+        let mut info = std::mem::zeroed();
+        if libc::dladdr(addr, &mut info) == 0 {
+            return Err("dladdr failed".into());
+        }
+        if info.dli_fname.is_null() {
+            return Err("dladdr returned null pointer".into());
+        }
+        let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
+        let os = OsStr::from_bytes(bytes);
+        Ok(PathBuf::from(os))
+    }
+}
+
+#[cfg(windows)]
+fn current_dll_path() -> Result<PathBuf, String> {
+    use std::ffi::OsString;
+    use std::io;
+    use std::os::windows::prelude::*;
+    use std::ptr;
+
+    use winapi::um::libloaderapi::{
+        GetModuleFileNameW, GetModuleHandleExW, GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
+    };
+
+    unsafe {
+        let mut module = ptr::null_mut();
+        let r = GetModuleHandleExW(
+            GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
+            current_dll_path as usize as *mut _,
+            &mut module,
+        );
+        if r == 0 {
+            return Err(format!("GetModuleHandleExW failed: {}", io::Error::last_os_error()));
+        }
+        let mut space = Vec::with_capacity(1024);
+        let r = GetModuleFileNameW(module, space.as_mut_ptr(), space.capacity() as u32);
+        if r == 0 {
+            return Err(format!("GetModuleFileNameW failed: {}", io::Error::last_os_error()));
+        }
+        let r = r as usize;
+        if r >= space.capacity() {
+            return Err(format!("our buffer was too small? {}", io::Error::last_os_error()));
+        }
+        space.set_len(r);
+        let os = OsString::from_wide(&space);
+        Ok(PathBuf::from(os))
+    }
+}
+
+pub fn sysroot_candidates() -> SmallVec<[PathBuf; 2]> {
+    let target = crate::config::host_triple();
+    let mut sysroot_candidates: SmallVec<[PathBuf; 2]> =
+        smallvec![get_or_default_sysroot().expect("Failed finding sysroot")];
+    let path = current_dll_path().and_then(|s| Ok(s.canonicalize().map_err(|e| e.to_string())?));
+    if let Ok(dll) = path {
+        // use `parent` twice to chop off the file name and then also the
+        // directory containing the dll which should be either `lib` or `bin`.
+        if let Some(path) = dll.parent().and_then(|p| p.parent()) {
+            // The original `path` pointed at the `rustc_driver` crate's dll.
+            // Now that dll should only be in one of two locations. The first is
+            // in the compiler's libdir, for example `$sysroot/lib/*.dll`. The
+            // other is the target's libdir, for example
+            // `$sysroot/lib/rustlib/$target/lib/*.dll`.
+            //
+            // We don't know which, so let's assume that if our `path` above
+            // ends in `$target` we *could* be in the target libdir, and always
+            // assume that we may be in the main libdir.
+            sysroot_candidates.push(path.to_owned());
+
+            if path.ends_with(target) {
+                sysroot_candidates.extend(
+                    path.parent() // chop off `$target`
+                        .and_then(|p| p.parent()) // chop off `rustlib`
+                        .and_then(|p| p.parent()) // chop off `lib`
+                        .map(|s| s.to_owned()),
+                );
+            }
+        }
+    }
+
+    return sysroot_candidates;
+}
+
 /// This function checks if sysroot is found using env::args().next(), and if it
-/// is not found, uses env::current_exe() to imply sysroot.
-pub fn get_or_default_sysroot() -> PathBuf {
+/// is not found, finds sysroot from current rustc_driver dll.
+pub fn get_or_default_sysroot() -> Result<PathBuf, String> {
     // Follow symlinks.  If the resolved path is relative, make it absolute.
     fn canonicalize(path: PathBuf) -> PathBuf {
         let path = fs::canonicalize(&path).unwrap_or(path);
@@ -74,17 +165,32 @@ pub fn get_or_default_sysroot() -> PathBuf {
         fix_windows_verbatim_for_gcc(&path)
     }
 
-    // Use env::current_exe() to get the path of the executable following
-    // symlinks/canonicalizing components.
-    fn from_current_exe() -> PathBuf {
-        match env::current_exe() {
-            Ok(exe) => {
-                let mut p = canonicalize(exe);
-                p.pop();
-                p.pop();
-                p
-            }
-            Err(e) => panic!("failed to get current_exe: {e}"),
+    fn default_from_rustc_driver_dll() -> Result<PathBuf, String> {
+        let dll = current_dll_path().and_then(|s| Ok(canonicalize(s)))?;
+
+        // `dll` will be in one of the following two:
+        // - compiler's libdir: $sysroot/lib/*.dll
+        // - target's libdir: $sysroot/lib/rustlib/$target/lib/*.dll
+        //
+        // use `parent` twice to chop off the file name and then also the
+        // directory containing the dll
+        let dir = dll.parent().and_then(|p| p.parent()).ok_or(format!(
+            "Could not move 2 levels upper using `parent()` on {}",
+            dll.display()
+        ))?;
+
+        // if `dir` points target's dir, move up to the sysroot
+        if dir.ends_with(crate::config::host_triple()) {
+            dir.parent() // chop off `$target`
+                .and_then(|p| p.parent()) // chop off `rustlib`
+                .and_then(|p| p.parent()) // chop off `lib`
+                .map(|s| s.to_owned())
+                .ok_or(format!(
+                    "Could not move 3 levels upper using `parent()` on {}",
+                    dir.display()
+                ))
+        } else {
+            Ok(dir.to_owned())
         }
     }
 
@@ -118,7 +224,5 @@ pub fn get_or_default_sysroot() -> PathBuf {
         }
     }
 
-    // Check if sysroot is found using env::args().next(), and if is not found,
-    // use env::current_exe() to imply sysroot.
-    from_env_args_next().unwrap_or_else(from_current_exe)
+    Ok(from_env_args_next().unwrap_or(default_from_rustc_driver_dll()?))
 }
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index 3f234a47a..8e9198b79 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -181,7 +181,7 @@ top_level_options!(
         #[rustc_lint_opt_deny_field_access("use `Session::codegen_units` instead of this field")]
         cli_forced_codegen_units: Option<usize> [UNTRACKED],
         #[rustc_lint_opt_deny_field_access("use `Session::lto` instead of this field")]
-        cli_forced_thinlto_off: bool [UNTRACKED],
+        cli_forced_local_thinlto_off: bool [UNTRACKED],
 
         /// Remap source path prefixes in all output (messages, object files, debug, etc.).
         remap_path_prefix: Vec<(PathBuf, PathBuf)> [TRACKED_NO_CRATE_HASH],
@@ -1382,6 +1382,9 @@ options! {
         "list the symbols defined by a library crate (default: no)"),
     macro_backtrace: bool = (false, parse_bool, [UNTRACKED],
         "show macro backtraces (default: no)"),
+    maximal_hir_to_mir_coverage: bool = (false, parse_bool, [TRACKED],
+        "save as much information as possible about the correspondence between MIR and HIR \
+        as source scopes (default: no)"),
     merge_functions: Option<MergeFunctions> = (None, parse_merge_functions, [TRACKED],
         "control the operation of the MergeFunctions LLVM pass, taking \
         the same values as the target option of the same name"),
@@ -1414,8 +1417,6 @@ options! {
         "run all passes except codegen; no output"),
     no_generate_arange_section: bool = (false, parse_no_flag, [TRACKED],
         "omit DWARF address ranges that give faster lookups"),
-    no_interleave_lints: bool = (false, parse_no_flag, [UNTRACKED],
-        "execute lints separately; allows benchmarking individual lints"),
     no_leak_check: bool = (false, parse_no_flag, [UNTRACKED],
         "disable the 'leak check' for subtyping; unsound, but useful for tests"),
     no_link: bool = (false, parse_no_flag, [TRACKED],
@@ -1587,6 +1588,8 @@ options! {
         "choose the TLS model to use (`rustc --print tls-models` for details)"),
     trace_macros: bool = (false, parse_bool, [UNTRACKED],
         "for every macro invocation, print its name and arguments (default: no)"),
+    track_diagnostics: bool = (false, parse_bool, [UNTRACKED],
+        "tracks where in rustc a diagnostic was emitted"),
     // Diagnostics are considered side-effects of a query (see `QuerySideEffects`) and are saved
     // alongside query results and changes to translation options can affect diagnostics - so
     // translation options should be tracked.
diff --git a/compiler/rustc_session/src/output.rs b/compiler/rustc_session/src/output.rs
index 2511bee46..8ee3057de 100644
--- a/compiler/rustc_session/src/output.rs
+++ b/compiler/rustc_session/src/output.rs
@@ -7,14 +7,14 @@ use crate::errors::{
 use crate::Session;
 use rustc_ast as ast;
 use rustc_span::symbol::sym;
-use rustc_span::Span;
+use rustc_span::{Span, Symbol};
 use std::path::{Path, PathBuf};
 
 pub fn out_filename(
     sess: &Session,
     crate_type: CrateType,
     outputs: &OutputFilenames,
-    crate_name: &str,
+    crate_name: Symbol,
 ) -> PathBuf {
     let default_filename = filename_for_input(sess, crate_type, crate_name, outputs);
     let out_filename = outputs
@@ -45,9 +45,9 @@ fn is_writeable(p: &Path) -> bool {
     }
 }
 
-pub fn find_crate_name(sess: &Session, attrs: &[ast::Attribute], input: &Input) -> String {
-    let validate = |s: String, span: Option<Span>| {
-        validate_crate_name(sess, &s, span);
+pub fn find_crate_name(sess: &Session, attrs: &[ast::Attribute], input: &Input) -> Symbol {
+    let validate = |s: Symbol, span: Option<Span>| {
+        validate_crate_name(sess, s, span);
         s
     };
 
@@ -59,38 +59,39 @@ pub fn find_crate_name(sess: &Session, attrs: &[ast::Attribute], input: &Input)
         sess.find_by_name(attrs, sym::crate_name).and_then(|at| at.value_str().map(|s| (at, s)));
 
     if let Some(ref s) = sess.opts.crate_name {
+        let s = Symbol::intern(s);
         if let Some((attr, name)) = attr_crate_name {
-            if name.as_str() != s {
+            if name != s {
                 sess.emit_err(CrateNameDoesNotMatch { span: attr.span, s, name });
             }
         }
-        return validate(s.clone(), None);
+        return validate(s, None);
     }
 
     if let Some((attr, s)) = attr_crate_name {
-        return validate(s.to_string(), Some(attr.span));
+        return validate(s, Some(attr.span));
     }
     if let Input::File(ref path) = *input {
         if let Some(s) = path.file_stem().and_then(|s| s.to_str()) {
             if s.starts_with('-') {
                 sess.emit_err(CrateNameInvalid { s });
             } else {
-                return validate(s.replace('-', "_"), None);
+                return validate(Symbol::intern(&s.replace('-', "_")), None);
             }
         }
     }
 
-    "rust_out".to_string()
+    Symbol::intern("rust_out")
 }
 
-pub fn validate_crate_name(sess: &Session, s: &str, sp: Option<Span>) {
+pub fn validate_crate_name(sess: &Session, s: Symbol, sp: Option<Span>) {
     let mut err_count = 0;
     {
         if s.is_empty() {
             err_count += 1;
             sess.emit_err(CrateNameEmpty { span: sp });
         }
-        for c in s.chars() {
+        for c in s.as_str().chars() {
             if c.is_alphanumeric() {
                 continue;
             }
@@ -109,7 +110,7 @@ pub fn validate_crate_name(sess: &Session, s: &str, sp: Option<Span>) {
 
 pub fn filename_for_metadata(
     sess: &Session,
-    crate_name: &str,
+    crate_name: Symbol,
     outputs: &OutputFilenames,
 ) -> PathBuf {
     // If the command-line specified the path, use that directly.
@@ -132,7 +133,7 @@ pub fn filename_for_metadata(
 pub fn filename_for_input(
     sess: &Session,
     crate_type: CrateType,
-    crate_name: &str,
+    crate_name: Symbol,
     outputs: &OutputFilenames,
 ) -> PathBuf {
     let libname = format!("{}{}", crate_name, sess.opts.cg.extra_filename);
diff --git a/compiler/rustc_session/src/parse.rs b/compiler/rustc_session/src/parse.rs
index a199947eb..f9f4f2979 100644
--- a/compiler/rustc_session/src/parse.rs
+++ b/compiler/rustc_session/src/parse.rs
@@ -97,6 +97,7 @@ pub fn feature_err<'a>(
 ///
 /// This variant allows you to control whether it is a library or language feature.
 /// Almost always, you want to use this for a language feature. If so, prefer `feature_err`.
+#[track_caller]
 pub fn feature_err_issue<'a>(
     sess: &'a ParseSess,
     feature: Symbol,
@@ -332,6 +333,7 @@ impl ParseSess {
         self.proc_macro_quoted_spans.lock().clone()
     }
 
+    #[track_caller]
     pub fn create_err<'a>(
         &'a self,
         err: impl IntoDiagnostic<'a>,
@@ -339,10 +341,12 @@ impl ParseSess {
         err.into_diagnostic(&self.span_diagnostic)
     }
 
+    #[track_caller]
     pub fn emit_err<'a>(&'a self, err: impl IntoDiagnostic<'a>) -> ErrorGuaranteed {
         self.create_err(err).emit()
     }
 
+    #[track_caller]
     pub fn create_warning<'a>(
         &'a self,
         warning: impl IntoDiagnostic<'a, ()>,
@@ -350,6 +354,7 @@ impl ParseSess {
         warning.into_diagnostic(&self.span_diagnostic)
     }
 
+    #[track_caller]
     pub fn emit_warning<'a>(&'a self, warning: impl IntoDiagnostic<'a, ()>) {
         self.create_warning(warning).emit()
     }
@@ -377,6 +382,7 @@ impl ParseSess {
     }
 
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_err(
         &self,
         msg: impl Into<DiagnosticMessage>,
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index 100c66f63..4c049a8d6 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -286,6 +286,7 @@ impl Session {
     }
 
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_span_warn<S: Into<MultiSpan>>(
         &self,
         sp: S,
@@ -294,6 +295,7 @@ impl Session {
         self.diagnostic().struct_span_warn(sp, msg)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_span_warn_with_expectation<S: Into<MultiSpan>>(
         &self,
         sp: S,
@@ -303,6 +305,7 @@ impl Session {
         self.diagnostic().struct_span_warn_with_expectation(sp, msg, id)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_span_warn_with_code<S: Into<MultiSpan>>(
         &self,
         sp: S,
@@ -312,10 +315,12 @@ impl Session {
         self.diagnostic().struct_span_warn_with_code(sp, msg, code)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_warn(&self, msg: impl Into<DiagnosticMessage>) -> DiagnosticBuilder<'_, ()> {
         self.diagnostic().struct_warn(msg)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_warn_with_expectation(
         &self,
         msg: impl Into<DiagnosticMessage>,
@@ -324,6 +329,7 @@ impl Session {
         self.diagnostic().struct_warn_with_expectation(msg, id)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_span_allow<S: Into<MultiSpan>>(
         &self,
         sp: S,
@@ -332,10 +338,12 @@ impl Session {
         self.diagnostic().struct_span_allow(sp, msg)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_allow(&self, msg: impl Into<DiagnosticMessage>) -> DiagnosticBuilder<'_, ()> {
         self.diagnostic().struct_allow(msg)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_expect(
         &self,
         msg: impl Into<DiagnosticMessage>,
@@ -344,6 +352,7 @@ impl Session {
         self.diagnostic().struct_expect(msg, id)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_span_err<S: Into<MultiSpan>>(
         &self,
         sp: S,
@@ -352,6 +361,7 @@ impl Session {
         self.diagnostic().struct_span_err(sp, msg)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_span_err_with_code<S: Into<MultiSpan>>(
         &self,
         sp: S,
@@ -362,12 +372,14 @@ impl Session {
     }
     // FIXME: This method should be removed (every error should have an associated error code).
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_err(
         &self,
         msg: impl Into<DiagnosticMessage>,
     ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
         self.parse_sess.struct_err(msg)
     }
+    #[track_caller]
     #[rustc_lint_diagnostics]
     pub fn struct_err_with_code(
         &self,
@@ -377,6 +389,7 @@ impl Session {
         self.diagnostic().struct_err_with_code(msg, code)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_warn_with_code(
         &self,
         msg: impl Into<DiagnosticMessage>,
@@ -385,6 +398,7 @@ impl Session {
         self.diagnostic().struct_warn_with_code(msg, code)
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_span_fatal<S: Into<MultiSpan>>(
         &self,
         sp: S,
@@ -407,6 +421,7 @@ impl Session {
     }
 
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: impl Into<DiagnosticMessage>) -> ! {
         self.diagnostic().span_fatal(sp, msg)
     }
@@ -424,6 +439,7 @@ impl Session {
         self.diagnostic().fatal(msg).raise()
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn span_err_or_warn<S: Into<MultiSpan>>(
         &self,
         is_warning: bool,
@@ -437,6 +453,7 @@ impl Session {
         }
     }
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn span_err<S: Into<MultiSpan>>(
         &self,
         sp: S,
@@ -457,12 +474,14 @@ impl Session {
     pub fn err(&self, msg: impl Into<DiagnosticMessage>) -> ErrorGuaranteed {
         self.diagnostic().err(msg)
     }
+    #[track_caller]
     pub fn create_err<'a>(
         &'a self,
         err: impl IntoDiagnostic<'a>,
     ) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
         self.parse_sess.create_err(err)
     }
+    #[track_caller]
     pub fn create_feature_err<'a>(
         &'a self,
         err: impl IntoDiagnostic<'a>,
@@ -475,33 +494,40 @@ impl Session {
         add_feature_diagnostics(&mut err, &self.parse_sess, feature);
         err
     }
+    #[track_caller]
     pub fn emit_err<'a>(&'a self, err: impl IntoDiagnostic<'a>) -> ErrorGuaranteed {
         self.parse_sess.emit_err(err)
     }
+    #[track_caller]
     pub fn create_warning<'a>(
         &'a self,
         err: impl IntoDiagnostic<'a, ()>,
     ) -> DiagnosticBuilder<'a, ()> {
         self.parse_sess.create_warning(err)
     }
+    #[track_caller]
     pub fn emit_warning<'a>(&'a self, warning: impl IntoDiagnostic<'a, ()>) {
         self.parse_sess.emit_warning(warning)
     }
+    #[track_caller]
     pub fn create_note<'a>(
         &'a self,
         note: impl IntoDiagnostic<'a, Noted>,
     ) -> DiagnosticBuilder<'a, Noted> {
         self.parse_sess.create_note(note)
     }
+    #[track_caller]
     pub fn emit_note<'a>(&'a self, note: impl IntoDiagnostic<'a, Noted>) -> Noted {
         self.parse_sess.emit_note(note)
     }
+    #[track_caller]
     pub fn create_fatal<'a>(
         &'a self,
         fatal: impl IntoDiagnostic<'a, !>,
     ) -> DiagnosticBuilder<'a, !> {
         self.parse_sess.create_fatal(fatal)
     }
+    #[track_caller]
     pub fn emit_fatal<'a>(&'a self, fatal: impl IntoDiagnostic<'a, !>) -> ! {
         self.parse_sess.emit_fatal(fatal)
     }
@@ -512,9 +538,12 @@ impl Session {
     pub fn has_errors(&self) -> Option<ErrorGuaranteed> {
         self.diagnostic().has_errors()
     }
-    pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
+    pub fn has_errors_or_delayed_span_bugs(&self) -> Option<ErrorGuaranteed> {
         self.diagnostic().has_errors_or_delayed_span_bugs()
     }
+    pub fn is_compilation_going_to_fail(&self) -> Option<ErrorGuaranteed> {
+        self.diagnostic().is_compilation_going_to_fail()
+    }
     pub fn abort_if_errors(&self) {
         self.diagnostic().abort_if_errors();
     }
@@ -536,11 +565,15 @@ impl Session {
         if self.err_count() == old_count {
             Ok(result)
         } else {
-            Err(ErrorGuaranteed::unchecked_claim_error_was_emitted())
+            Err(self.delay_span_bug(
+                rustc_span::DUMMY_SP,
+                "`self.err_count()` changed but an error was not emitted",
+            ))
         }
     }
     #[allow(rustc::untranslatable_diagnostic)]
     #[allow(rustc::diagnostic_outside_of_impl)]
+    #[track_caller]
     pub fn span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: impl Into<DiagnosticMessage>) {
         self.diagnostic().span_warn(sp, msg)
     }
@@ -587,6 +620,8 @@ impl Session {
     pub fn note_without_error(&self, msg: impl Into<DiagnosticMessage>) {
         self.diagnostic().note_without_error(msg)
     }
+
+    #[track_caller]
     pub fn span_note_without_error<S: Into<MultiSpan>>(
         &self,
         sp: S,
@@ -917,6 +952,17 @@ impl Session {
     ) -> Option<Symbol> {
         attrs.iter().find(|at| at.has_name(name)).and_then(|at| at.value_str())
     }
+
+    pub fn diagnostic_width(&self) -> usize {
+        let default_column_width = 140;
+        if let Some(width) = self.opts.diagnostic_width {
+            width
+        } else if self.opts.unstable_opts.ui_testing {
+            default_column_width
+        } else {
+            termize::dimensions().map_or(default_column_width, |(w, _)| w)
+        }
+    }
 }
 
 // JUSTIFICATION: defn of the suggested wrapper fns
@@ -989,11 +1035,8 @@ impl Session {
                 return config::Lto::Fat;
             }
             config::LtoCli::Thin => {
-                return if self.opts.cli_forced_thinlto_off {
-                    config::Lto::Fat
-                } else {
-                    config::Lto::Thin
-                };
+                // The user explicitly asked for ThinLTO
+                return config::Lto::Thin;
             }
         }
 
@@ -1005,7 +1048,7 @@ impl Session {
 
         // If processing command line options determined that we're incompatible
         // with ThinLTO (e.g., `-C lto --emit llvm-ir`) then return that option.
-        if self.opts.cli_forced_thinlto_off {
+        if self.opts.cli_forced_local_thinlto_off {
             return config::Lto::No;
         }
 
@@ -1213,6 +1256,7 @@ fn default_emitter(
     fallback_bundle: LazyFallbackBundle,
 ) -> Box<dyn Emitter + sync::Send> {
     let macro_backtrace = sopts.unstable_opts.macro_backtrace;
+    let track_diagnostics = sopts.unstable_opts.track_diagnostics;
     match sopts.error_format {
         config::ErrorOutputType::HumanReadable(kind) => {
             let (short, color_config) = kind.unzip();
@@ -1236,6 +1280,7 @@ fn default_emitter(
                     sopts.unstable_opts.teach,
                     sopts.diagnostic_width,
                     macro_backtrace,
+                    track_diagnostics,
                 );
                 Box::new(emitter.ui_testing(sopts.unstable_opts.ui_testing))
             }
@@ -1250,6 +1295,7 @@ fn default_emitter(
                 json_rendered,
                 sopts.diagnostic_width,
                 macro_backtrace,
+                track_diagnostics,
             )
             .ui_testing(sopts.unstable_opts.ui_testing),
         ),
@@ -1280,7 +1326,7 @@ pub fn build_session(
 
     let sysroot = match &sopts.maybe_sysroot {
         Some(sysroot) => sysroot.clone(),
-        None => filesearch::get_or_default_sysroot(),
+        None => filesearch::get_or_default_sysroot().expect("Failed finding sysroot"),
     };
 
     let target_cfg = config::build_target_config(&sopts, target_override, &sysroot);
@@ -1325,7 +1371,7 @@ pub fn build_session(
         let profiler = SelfProfiler::new(
             directory,
             sopts.crate_name.as_deref(),
-            sopts.unstable_opts.self_profile_events.as_ref().map(|xs| &xs[..]),
+            sopts.unstable_opts.self_profile_events.as_deref(),
             &sopts.unstable_opts.self_profile_counter,
         );
         match profiler {
@@ -1359,7 +1405,7 @@ pub fn build_session(
         local_crate_source_file.map(|path| file_path_mapping.map_prefix(path).0);
 
     let optimization_fuel = Lock::new(OptimizationFuel {
-        remaining: sopts.unstable_opts.fuel.as_ref().map_or(0, |i| i.1),
+        remaining: sopts.unstable_opts.fuel.as_ref().map_or(0, |&(_, i)| i),
         out_of_fuel: false,
     });
     let print_fuel = AtomicU64::new(0);
@@ -1552,11 +1598,18 @@ fn early_error_handler(output: config::ErrorOutputType) -> rustc_errors::Handler
                 false,
                 None,
                 false,
+                false,
             ))
         }
-        config::ErrorOutputType::Json { pretty, json_rendered } => {
-            Box::new(JsonEmitter::basic(pretty, json_rendered, None, fallback_bundle, None, false))
-        }
+        config::ErrorOutputType::Json { pretty, json_rendered } => Box::new(JsonEmitter::basic(
+            pretty,
+            json_rendered,
+            None,
+            fallback_bundle,
+            None,
+            false,
+            false,
+        )),
     };
     rustc_errors::Handler::with_emitter(true, None, emitter)
 }