Auto merge of #119662 - matthiaskrgr:rollup-ehofh5n, r=matthiaskrgr

Rollup of 9 pull requests

Successful merges:

 - #118194 (rustdoc: search for tuples and unit by type with `()`)
 - #118781 (merge core_panic feature into panic_internals)
 - #119486 (pass allow-{dirty,staged} to clippy)
 - #119591 (rustc_mir_transform: Make DestinationPropagation stable for queries)
 - #119595 (Fixed ambiguity in hint.rs)
 - #119624 (rustc_span: More consistent span combination operations)
 - #119653 (compiler: update Fuchsia sanitizer support.)
 - #119655 (Remove ignore-stage1 that was added when changing error count msg)
 - #119661 (Strip lld-wrapper binaries)

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

11 files changed, 135 insertions, 49 deletions

diff --git a/src/bootstrap/src/core/build_steps/check.rs b/src/bootstrap/src/core/build_steps/check.rs
index f1f2f28909d..5f0afdb1b36 100644
--- a/src/bootstrap/src/core/build_steps/check.rs
+++ b/src/bootstrap/src/core/build_steps/check.rs
@@ -28,7 +28,9 @@ fn args(builder: &Builder<'_>) -> Vec<String> {
         arr.iter().copied().map(String::from)
     }
 
-    if let Subcommand::Clippy { fix, allow, deny, warn, forbid, .. } = &builder.config.cmd {
+    if let Subcommand::Clippy { fix, allow_dirty, allow_staged, allow, deny, warn, forbid } =
+        &builder.config.cmd
+    {
         // disable the most spammy clippy lints
         let ignored_lints = vec![
             "many_single_char_names", // there are a lot in stdarch
@@ -49,7 +51,16 @@ fn args(builder: &Builder<'_>) -> Vec<String> {
                 // As a workaround, avoid checking tests and benches when passed --fix.
                 "--lib", "--bins", "--examples",
             ]));
+
+            if *allow_dirty {
+                args.push("--allow-dirty".to_owned());
+            }
+
+            if *allow_staged {
+                args.push("--allow-staged".to_owned());
+            }
         }
+
         args.extend(strings(&["--", "--cap-lints", "warn"]));
         args.extend(ignored_lints.iter().map(|lint| format!("-Aclippy::{}", lint)));
         let mut clippy_lint_levels: Vec<String> = Vec::new();
diff --git a/src/bootstrap/src/core/config/flags.rs b/src/bootstrap/src/core/config/flags.rs
index 0b13726081b..8af454001a6 100644
--- a/src/bootstrap/src/core/config/flags.rs
+++ b/src/bootstrap/src/core/config/flags.rs
@@ -255,6 +255,10 @@ pub enum Subcommand {
     Clippy {
         #[arg(long)]
         fix: bool,
+        #[arg(long, requires = "fix")]
+        allow_dirty: bool,
+        #[arg(long, requires = "fix")]
+        allow_staged: bool,
         /// clippy lints to allow
         #[arg(global(true), short = 'A', action = clap::ArgAction::Append, value_name = "LINT")]
         allow: Vec<String>,
diff --git a/src/doc/rustdoc/src/read-documentation/search.md b/src/doc/rustdoc/src/read-documentation/search.md
index 1f45bd6c6b8..b5f4060f059 100644
--- a/src/doc/rustdoc/src/read-documentation/search.md
+++ b/src/doc/rustdoc/src/read-documentation/search.md
@@ -147,15 +147,38 @@ will match these queries:
 * `Read -> Result<Vec<u8>, Error>`
 * `Read -> Result<Error, Vec>`
 * `Read -> Result<Vec<u8>>`
+* `Read -> u8`
 
 But it *does not* match `Result<Vec, u8>` or `Result<u8<Vec>>`.
 
-Function signature searches also support arrays and slices. The explicit name
-`primitive:slice<u8>` and `primitive:array<u8>` can be used to match a slice
-or array of bytes, while square brackets `[u8]` will match either one. Empty
-square brackets, `[]`, will match any slice or array regardless of what
-it contains, while a slice with a type parameter, like `[T]`, will only match
-functions that actually operate on generic slices.
+### Primitives with Special Syntax
+
+| Shorthand | Explicit names                                   |
+| --------- | ------------------------------------------------ |
+| `[]`      | `primitive:slice` and/or `primitive:array`       |
+| `[T]`     | `primitive:slice<T>` and/or `primitive:array<T>` |
+| `()`      | `primitive:unit` and/or `primitive:tuple`        |
+| `(T)`     | `T`                                              |
+| `(T,)`    | `primitive:tuple<T>`                             |
+| `!`       | `primitive:never`                                |
+
+When searching for `[]`, Rustdoc will return search results with either slices
+or arrays. If you know which one you want, you can force it to return results
+for `primitive:slice` or `primitive:array` using the explicit name syntax.
+Empty square brackets, `[]`, will match any slice or array regardless of what
+it contains, or an item type can be provided, such as `[u8]` or `[T]`, to
+explicitly find functions that operate on byte slices or generic slices,
+respectively.
+
+A single type expression wrapped in parens is the same as that type expression,
+since parens act as the grouping operator. If they're empty, though, they will
+match both `unit` and `tuple`, and if there's more than one type (or a trailing
+or leading comma) it is the same as `primitive:tuple<...>`.
+
+However, since items can be left out of the query, `(T)` will still return
+results for types that match tuples, even though it also matches the type on
+its own. That is, `(u32)` matches `(u32,)` for the exact same reason that it
+also matches `Result<u32, Error>`.
 
 ### Limitations and quirks of type-based search
 
@@ -188,11 +211,10 @@ Most of these limitations should be addressed in future version of Rustdoc.
     that you don't want a type parameter, you can force it to match
     something else by giving it a different prefix like `struct:T`.
 
-  * It's impossible to search for references, pointers, or tuples. The
+  * It's impossible to search for references or pointers. The
     wrapped types can be searched for, so a function that takes `&File` can
     be found with `File`, but you'll get a parse error when typing an `&`
-    into the search field. Similarly, `Option<(T, U)>` can be matched with
-    `Option<T, U>`, but `(` will give a parse error.
+    into the search field.
 
   * Searching for lifetimes is not supported.
 
@@ -216,8 +238,9 @@ Item filters can be used in both name-based and type signature-based searches.
 ```text
 ident = *(ALPHA / DIGIT / "_")
 path = ident *(DOUBLE-COLON ident) [!]
-slice = OPEN-SQUARE-BRACKET [ nonempty-arg-list ] CLOSE-SQUARE-BRACKET
-arg = [type-filter *WS COLON *WS] (path [generics] / slice / [!])
+slice-like = OPEN-SQUARE-BRACKET [ nonempty-arg-list ] CLOSE-SQUARE-BRACKET
+tuple-like = OPEN-PAREN [ nonempty-arg-list ] CLOSE-PAREN
+arg = [type-filter *WS COLON *WS] (path [generics] / slice-like / tuple-like / [!])
 type-sep = COMMA/WS *(COMMA/WS)
 nonempty-arg-list = *(type-sep) arg *(type-sep arg) *(type-sep)
 generic-arg-list = *(type-sep) arg [ EQUAL arg ] *(type-sep arg [ EQUAL arg ]) *(type-sep)
@@ -263,6 +286,8 @@ OPEN-ANGLE-BRACKET = "<"
 CLOSE-ANGLE-BRACKET = ">"
 OPEN-SQUARE-BRACKET = "["
 CLOSE-SQUARE-BRACKET = "]"
+OPEN-PAREN = "("
+CLOSE-PAREN = ")"
 COLON = ":"
 DOUBLE-COLON = "::"
 QUOTE = %x22
diff --git a/src/doc/unstable-book/src/library-features/core-panic.md b/src/doc/unstable-book/src/library-features/core-panic.md
deleted file mode 100644
index c197588404c..00000000000
--- a/src/doc/unstable-book/src/library-features/core-panic.md
+++ /dev/null
@@ -1,5 +0,0 @@
-# `core_panic`
-
-This feature is internal to the Rust compiler and is not intended for general use.
-
-------------------------
diff --git a/src/etc/completions/x.py.fish b/src/etc/completions/x.py.fish
index 95bce9e31a4..9fc95fd09ba 100644
--- a/src/etc/completions/x.py.fish
+++ b/src/etc/completions/x.py.fish
@@ -143,6 +143,8 @@ complete -c x.py -n "__fish_seen_subcommand_from clippy" -l llvm-profile-use -d
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l reproducible-artifact -d 'Additional reproducible artifacts that should be added to the reproducible artifacts archive' -r
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l set -d 'override options in config.toml' -r -f
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l fix
+complete -c x.py -n "__fish_seen_subcommand_from clippy" -l allow-dirty
+complete -c x.py -n "__fish_seen_subcommand_from clippy" -l allow-staged
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -s v -l verbose -d 'use verbose output (-vv for very verbose)'
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -s i -l incremental -d 'use incremental compilation'
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l include-default-paths -d 'include default paths in addition to the provided ones'
diff --git a/src/etc/completions/x.py.ps1 b/src/etc/completions/x.py.ps1
index dabc3b16e4d..6359b7ff086 100644
--- a/src/etc/completions/x.py.ps1
+++ b/src/etc/completions/x.py.ps1
@@ -188,6 +188,8 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--reproducible-artifact', 'reproducible-artifact', [CompletionResultType]::ParameterName, 'Additional reproducible artifacts that should be added to the reproducible artifacts archive')
             [CompletionResult]::new('--set', 'set', [CompletionResultType]::ParameterName, 'override options in config.toml')
             [CompletionResult]::new('--fix', 'fix', [CompletionResultType]::ParameterName, 'fix')
+            [CompletionResult]::new('--allow-dirty', 'allow-dirty', [CompletionResultType]::ParameterName, 'allow-dirty')
+            [CompletionResult]::new('--allow-staged', 'allow-staged', [CompletionResultType]::ParameterName, 'allow-staged')
             [CompletionResult]::new('-v', 'v', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('--verbose', 'verbose', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('-i', 'i', [CompletionResultType]::ParameterName, 'use incremental compilation')
diff --git a/src/etc/completions/x.py.sh b/src/etc/completions/x.py.sh
index f739f46b88b..8ffd8f67df2 100644
--- a/src/etc/completions/x.py.sh
+++ b/src/etc/completions/x.py.sh
@@ -615,7 +615,7 @@ _x.py() {
             return 0
             ;;
         x.py__clippy)
-            opts="-A -D -W -F -v -i -j -h --fix --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-A -D -W -F -v -i -j -h --fix --allow-dirty --allow-staged --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
diff --git a/src/etc/completions/x.py.zsh b/src/etc/completions/x.py.zsh
index 639f0487f8b..ea7e4ba6758 100644
--- a/src/etc/completions/x.py.zsh
+++ b/src/etc/completions/x.py.zsh
@@ -182,6 +182,8 @@ _arguments "${_arguments_options[@]}" \
 '*--reproducible-artifact=[Additional reproducible artifacts that should be added to the reproducible artifacts archive]:REPRODUCIBLE_ARTIFACT: ' \
 '*--set=[override options in config.toml]:section.option=value:( )' \
 '--fix[]' \
+'--allow-dirty[]' \
+'--allow-staged[]' \
 '*-v[use verbose output (-vv for very verbose)]' \
 '*--verbose[use verbose output (-vv for very verbose)]' \
 '-i[use incremental compilation]' \
diff --git a/src/librustdoc/html/render/search_index.rs b/src/librustdoc/html/render/search_index.rs
index e49df400c83..cb059082f85 100644
--- a/src/librustdoc/html/render/search_index.rs
+++ b/src/librustdoc/html/render/search_index.rs
@@ -566,6 +566,9 @@ fn get_index_type_id(
         // The type parameters are converted to generics in `simplify_fn_type`
         clean::Slice(_) => Some(RenderTypeId::Primitive(clean::PrimitiveType::Slice)),
         clean::Array(_, _) => Some(RenderTypeId::Primitive(clean::PrimitiveType::Array)),
+        clean::Tuple(ref n) if n.is_empty() => {
+            Some(RenderTypeId::Primitive(clean::PrimitiveType::Unit))
+        }
         clean::Tuple(_) => Some(RenderTypeId::Primitive(clean::PrimitiveType::Tuple)),
         clean::QPath(ref data) => {
             if data.self_type.is_self_type()
diff --git a/src/librustdoc/html/static/js/search.js b/src/librustdoc/html/static/js/search.js
index e0708485fc0..a5e2bc1c7af 100644
--- a/src/librustdoc/html/static/js/search.js
+++ b/src/librustdoc/html/static/js/search.js
@@ -260,6 +260,18 @@ function initSearch(rawSearchIndex) {
      * Special type name IDs for searching by both array and slice (`[]` syntax).
      */
     let typeNameIdOfArrayOrSlice;
+    /**
+     * Special type name IDs for searching by tuple.
+     */
+    let typeNameIdOfTuple;
+    /**
+     * Special type name IDs for searching by unit.
+     */
+    let typeNameIdOfUnit;
+    /**
+     * Special type name IDs for searching by both tuple and unit (`()` syntax).
+     */
+    let typeNameIdOfTupleOrUnit;
 
     /**
      * Add an item to the type Name->ID map, or, if one already exists, use it.
@@ -295,11 +307,7 @@ function initSearch(rawSearchIndex) {
     }
 
     function isEndCharacter(c) {
-        return "=,>-]".indexOf(c) !== -1;
-    }
-
-    function isErrorCharacter(c) {
-        return "()".indexOf(c) !== -1;
+        return "=,>-])".indexOf(c) !== -1;
     }
 
     function itemTypeFromName(typename) {
@@ -585,8 +593,6 @@ function initSearch(rawSearchIndex) {
                         throw ["Unexpected ", "!", ": it can only be at the end of an ident"];
                     }
                     foundExclamation = parserState.pos;
-                } else if (isErrorCharacter(c)) {
-                    throw ["Unexpected ", c];
                 } else if (isPathSeparator(c)) {
                     if (c === ":") {
                         if (!isPathStart(parserState)) {
@@ -616,11 +622,14 @@ function initSearch(rawSearchIndex) {
                     }
                 } else if (
                     c === "[" ||
+                    c === "(" ||
                     isEndCharacter(c) ||
                     isSpecialStartCharacter(c) ||
                     isSeparatorCharacter(c)
                 ) {
                     break;
+                } else if (parserState.pos > 0) {
+                    throw ["Unexpected ", c, " after ", parserState.userQuery[parserState.pos - 1]];
                 } else {
                     throw ["Unexpected ", c];
                 }
@@ -661,15 +670,24 @@ function initSearch(rawSearchIndex) {
         skipWhitespace(parserState);
         let start = parserState.pos;
         let end;
-        if (parserState.userQuery[parserState.pos] === "[") {
+        if ("[(".indexOf(parserState.userQuery[parserState.pos]) !== -1) {
+let endChar = ")";
+let name = "()";
+let friendlyName = "tuple";
+
+if (parserState.userQuery[parserState.pos] === "[") {
+    endChar = "]";
+    name = "[]";
+    friendlyName = "slice";
+}
             parserState.pos += 1;
-            getItemsBefore(query, parserState, generics, "]");
+            const { foundSeparator } = getItemsBefore(query, parserState, generics, endChar);
             const typeFilter = parserState.typeFilter;
             const isInBinding = parserState.isInBinding;
             if (typeFilter !== null && typeFilter !== "primitive") {
                 throw [
                     "Invalid search type: primitive ",
-                    "[]",
+                    name,
                     " and ",
                     typeFilter,
                     " both specified",
@@ -677,27 +695,31 @@ function initSearch(rawSearchIndex) {
             }
             parserState.typeFilter = null;
             parserState.isInBinding = null;
-            parserState.totalElems += 1;
-            if (isInGenerics) {
-                parserState.genericsElems += 1;
-            }
             for (const gen of generics) {
                 if (gen.bindingName !== null) {
-                    throw ["Type parameter ", "=", " cannot be within slice ", "[]"];
+                    throw ["Type parameter ", "=", ` cannot be within ${friendlyName} `, name];
                 }
             }
-            elems.push({
-                name: "[]",
-                id: null,
-                fullPath: ["[]"],
-                pathWithoutLast: [],
-                pathLast: "[]",
-                normalizedPathLast: "[]",
-                generics,
-                typeFilter: "primitive",
-                bindingName: isInBinding,
-                bindings: new Map(),
-            });
+            if (name === "()" && !foundSeparator && generics.length === 1 && typeFilter === null) {
+                elems.push(generics[0]);
+            } else {
+                parserState.totalElems += 1;
+                if (isInGenerics) {
+                    parserState.genericsElems += 1;
+                }
+                elems.push({
+                    name: name,
+                    id: null,
+                    fullPath: [name],
+                    pathWithoutLast: [],
+                    pathLast: name,
+                    normalizedPathLast: name,
+                    generics,
+                    bindings: new Map(),
+                    typeFilter: "primitive",
+                    bindingName: isInBinding,
+                });
+            }
         } else {
             const isStringElem = parserState.userQuery[start] === "\"";
             // We handle the strings on their own mostly to make code easier to follow.
@@ -770,9 +792,11 @@ function initSearch(rawSearchIndex) {
      * @param {Array<QueryElement>} elems - This is where the new {QueryElement} will be added.
      * @param {string} endChar            - This function will stop when it'll encounter this
      *                                      character.
+     * @returns {{foundSeparator: bool}}
      */
     function getItemsBefore(query, parserState, elems, endChar) {
         let foundStopChar = true;
+        let foundSeparator = false;
         let start = parserState.pos;
 
         // If this is a generic, keep the outer item's type filter around.
@@ -786,6 +810,8 @@ function initSearch(rawSearchIndex) {
             extra = "<";
         } else if (endChar === "]") {
             extra = "[";
+        } else if (endChar === ")") {
+            extra = "(";
         } else if (endChar === "") {
             extra = "->";
         } else {
@@ -802,6 +828,7 @@ function initSearch(rawSearchIndex) {
             } else if (isSeparatorCharacter(c)) {
                 parserState.pos += 1;
                 foundStopChar = true;
+                foundSeparator = true;
                 continue;
             } else if (c === ":" && isPathStart(parserState)) {
                 throw ["Unexpected ", "::", ": paths cannot start with ", "::"];
@@ -879,6 +906,8 @@ function initSearch(rawSearchIndex) {
 
         parserState.typeFilter = oldTypeFilter;
         parserState.isInBinding = oldIsInBinding;
+
+        return { foundSeparator };
     }
 
     /**
@@ -926,6 +955,8 @@ function initSearch(rawSearchIndex) {
                         break;
                     }
                     throw ["Unexpected ", c, " (did you mean ", "->", "?)"];
+                } else if (parserState.pos > 0) {
+                    throw ["Unexpected ", c, " after ", parserState.userQuery[parserState.pos - 1]];
                 }
                 throw ["Unexpected ", c];
             } else if (c === ":" && !isPathStart(parserState)) {
@@ -1599,6 +1630,11 @@ function initSearch(rawSearchIndex) {
                 ) {
                     // [] matches primitive:array or primitive:slice
                     // if it matches, then we're fine, and this is an appropriate match candidate
+                } else if (queryElem.id === typeNameIdOfTupleOrUnit &&
+                    (fnType.id === typeNameIdOfTuple || fnType.id === typeNameIdOfUnit)
+                ) {
+                    // () matches primitive:tuple or primitive:unit
+                    // if it matches, then we're fine, and this is an appropriate match candidate
                 } else if (fnType.id !== queryElem.id || queryElem.id === null) {
                     return false;
                 }
@@ -1792,7 +1828,7 @@ function initSearch(rawSearchIndex) {
                 if (row.id > 0 && elem.id > 0 && elem.pathWithoutLast.length === 0 &&
                     typePassesFilter(elem.typeFilter, row.ty) && elem.generics.length === 0 &&
                     // special case
-                    elem.id !== typeNameIdOfArrayOrSlice
+                    elem.id !== typeNameIdOfArrayOrSlice && elem.id !== typeNameIdOfTupleOrUnit
                 ) {
                     return row.id === elem.id || checkIfInList(
                         row.generics,
@@ -2886,12 +2922,15 @@ ${item.displayPath}<span class="${type}">${name}</span>\
      */
     function buildFunctionTypeFingerprint(type, output, fps) {
         let input = type.id;
-        // All forms of `[]` get collapsed down to one thing in the bloom filter.
+        // All forms of `[]`/`()` get collapsed down to one thing in the bloom filter.
         // Differentiating between arrays and slices, if the user asks for it, is
         // still done in the matching algorithm.
         if (input === typeNameIdOfArray || input === typeNameIdOfSlice) {
             input = typeNameIdOfArrayOrSlice;
         }
+        if (input === typeNameIdOfTuple || input === typeNameIdOfUnit) {
+            input = typeNameIdOfTupleOrUnit;
+        }
         // http://burtleburtle.net/bob/hash/integer.html
         // ~~ is toInt32. It's used before adding, so
         // the number stays in safe integer range.
@@ -2991,7 +3030,10 @@ ${item.displayPath}<span class="${type}">${name}</span>\
         // that can be searched using `[]` syntax.
         typeNameIdOfArray = buildTypeMapIndex("array");
         typeNameIdOfSlice = buildTypeMapIndex("slice");
+        typeNameIdOfTuple = buildTypeMapIndex("tuple");
+        typeNameIdOfUnit = buildTypeMapIndex("unit");
         typeNameIdOfArrayOrSlice = buildTypeMapIndex("[]");
+        typeNameIdOfTupleOrUnit = buildTypeMapIndex("()");
 
         // Function type fingerprints are 128-bit bloom filters that are used to
         // estimate the distance between function and query.
diff --git a/src/librustdoc/passes/lint/check_code_block_syntax.rs b/src/librustdoc/passes/lint/check_code_block_syntax.rs
index 53c7f0f6e15..782938f1094 100644
--- a/src/librustdoc/passes/lint/check_code_block_syntax.rs
+++ b/src/librustdoc/passes/lint/check_code_block_syntax.rs
@@ -8,7 +8,7 @@ use rustc_errors::{
 use rustc_parse::parse_stream_from_source_str;
 use rustc_resolve::rustdoc::source_span_for_markdown_range;
 use rustc_session::parse::ParseSess;
-use rustc_span::hygiene::{AstPass, ExpnData, ExpnKind, LocalExpnId};
+use rustc_span::hygiene::{AstPass, ExpnData, ExpnKind, LocalExpnId, Transparency};
 use rustc_span::source_map::{FilePathMapping, SourceMap};
 use rustc_span::{FileName, InnerSpan, DUMMY_SP};
 
@@ -50,7 +50,7 @@ fn check_rust_syntax(
     let expn_data =
         ExpnData::default(ExpnKind::AstPass(AstPass::TestHarness), DUMMY_SP, edition, None, None);
     let expn_id = cx.tcx.with_stable_hashing_context(|hcx| LocalExpnId::fresh(expn_data, hcx));
-    let span = DUMMY_SP.fresh_expansion(expn_id);
+    let span = DUMMY_SP.apply_mark(expn_id.to_expn_id(), Transparency::Transparent);
 
     let is_empty = rustc_driver::catch_fatal_errors(|| {
         parse_stream_from_source_str(