Auto merge of rust-lang#101928 - notriddle:rollup-pexhhxe, r=notriddle

Rollup of 8 pull requests

Successful merges:

 - rust-lang#101340 (Adding Fuchsia zxdb debugging walkthrough to docs)
 - rust-lang#101741 (Adding needs-unwind arg to applicable compiler ui tests)
 - rust-lang#101782 (Update `symbol_mangling` diagnostics migration)
 - rust-lang#101878 (More simple formatting)
 - rust-lang#101898 (Remove some unused CSS rules)
 - rust-lang#101911 (rustdoc: remove no-op CSS on `.source .content`)
 - rust-lang#101914 (rustdoc-json-types: Document that ResolvedPath can also be a union)
 - rust-lang#101921 (Pass --cfg=bootstrap for rustdoc for proc_macro crates)

Failed merges:

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

Author: bors

Diff for: compiler/rustc_ast/src/ast.rs

@@ -2088,15 +2088,15 @@ pub enum InlineAsmRegOrRegClass {
 bitflags::bitflags! {
     #[derive(Encodable, Decodable, HashStable_Generic)]
     pub struct InlineAsmOptions: u16 {
-        const PURE = 1 << 0;
-        const NOMEM = 1 << 1;
-        const READONLY = 1 << 2;
+        const PURE            = 1 << 0;
+        const NOMEM           = 1 << 1;
+        const READONLY        = 1 << 2;
         const PRESERVES_FLAGS = 1 << 3;
-        const NORETURN = 1 << 4;
-        const NOSTACK = 1 << 5;
-        const ATT_SYNTAX = 1 << 6;
-        const RAW = 1 << 7;
-        const MAY_UNWIND = 1 << 8;
+        const NORETURN        = 1 << 4;
+        const NOSTACK         = 1 << 5;
+        const ATT_SYNTAX      = 1 << 6;
+        const RAW             = 1 << 7;
+        const MAY_UNWIND      = 1 << 8;
     }
 }
 

Diff for: compiler/rustc_ast/src/util/parser.rs

@@ -297,11 +297,11 @@ impl ExprPrecedence {
         match self {
             ExprPrecedence::Closure => PREC_CLOSURE,
 
-            ExprPrecedence::Break |
-            ExprPrecedence::Continue |
-            ExprPrecedence::Ret |
-            ExprPrecedence::Yield |
-            ExprPrecedence::Yeet => PREC_JUMP,
+            ExprPrecedence::Break
+            | ExprPrecedence::Continue
+            | ExprPrecedence::Ret
+            | ExprPrecedence::Yield
+            | ExprPrecedence::Yeet => PREC_JUMP,
 
             // `Range` claims to have higher precedence than `Assign`, but `x .. x = x` fails to
             // parse, instead of parsing as `(x .. x) = x`.  Giving `Range` a lower precedence
@@ -318,43 +318,43 @@ impl ExprPrecedence {
             ExprPrecedence::AssignOp => AssocOp::Assign.precedence() as i8,
 
             // Unary, prefix
-            ExprPrecedence::Box |
-            ExprPrecedence::AddrOf |
+            ExprPrecedence::Box
+            | ExprPrecedence::AddrOf
             // Here `let pats = expr` has `let pats =` as a "unary" prefix of `expr`.
             // However, this is not exactly right. When `let _ = a` is the LHS of a binop we
             // need parens sometimes. E.g. we can print `(let _ = a) && b` as `let _ = a && b`
             // but we need to print `(let _ = a) < b` as-is with parens.
-            ExprPrecedence::Let |
-            ExprPrecedence::Unary => PREC_PREFIX,
+            | ExprPrecedence::Let
+            | ExprPrecedence::Unary => PREC_PREFIX,
 
             // Unary, postfix
-            ExprPrecedence::Await |
-            ExprPrecedence::Call |
-            ExprPrecedence::MethodCall |
-            ExprPrecedence::Field |
-            ExprPrecedence::Index |
-            ExprPrecedence::Try |
-            ExprPrecedence::InlineAsm |
-            ExprPrecedence::Mac => PREC_POSTFIX,
+            ExprPrecedence::Await
+            | ExprPrecedence::Call
+            | ExprPrecedence::MethodCall
+            | ExprPrecedence::Field
+            | ExprPrecedence::Index
+            | ExprPrecedence::Try
+            | ExprPrecedence::InlineAsm
+            | ExprPrecedence::Mac => PREC_POSTFIX,
 
             // Never need parens
-            ExprPrecedence::Array |
-            ExprPrecedence::Repeat |
-            ExprPrecedence::Tup |
-            ExprPrecedence::Lit |
-            ExprPrecedence::Path |
-            ExprPrecedence::Paren |
-            ExprPrecedence::If |
-            ExprPrecedence::While |
-            ExprPrecedence::ForLoop |
-            ExprPrecedence::Loop |
-            ExprPrecedence::Match |
-            ExprPrecedence::ConstBlock |
-            ExprPrecedence::Block |
-            ExprPrecedence::TryBlock |
-            ExprPrecedence::Async |
-            ExprPrecedence::Struct |
-            ExprPrecedence::Err => PREC_PAREN,
+            ExprPrecedence::Array
+            | ExprPrecedence::Repeat
+            | ExprPrecedence::Tup
+            | ExprPrecedence::Lit
+            | ExprPrecedence::Path
+            | ExprPrecedence::Paren
+            | ExprPrecedence::If
+            | ExprPrecedence::While
+            | ExprPrecedence::ForLoop
+            | ExprPrecedence::Loop
+            | ExprPrecedence::Match
+            | ExprPrecedence::ConstBlock
+            | ExprPrecedence::Block
+            | ExprPrecedence::TryBlock
+            | ExprPrecedence::Async
+            | ExprPrecedence::Struct
+            | ExprPrecedence::Err => PREC_PAREN,
         }
     }
 }

Diff for: compiler/rustc_error_messages/locales/en-US/symbol_mangling.ftl

@@ -1,7 +1 @@
-symbol_mangling_invalid_symbol_name = symbol-name({$mangled_formatted})
-
-symbol_mangling_invalid_trait_item = demangling({$demangling_formatted})
-
-symbol_mangling_alt_invalid_trait_item = demangling-alt({$alt_demangling_formatted})
-
-symbol_mangling_invalid_def_path = def-path({$def_path})
+symbol_mangling_test_output = {$kind}({$content})

Diff for: compiler/rustc_hir/src/hir.rs

@@ -139,11 +139,10 @@ impl LifetimeName {
         match self {
             LifetimeName::ImplicitObjectLifetimeDefault | LifetimeName::Infer => true,
 
-            // It might seem surprising that `Fresh` counts as
-            // *not* elided -- but this is because, as far as the code
-            // in the compiler is concerned -- `Fresh` variants act
-            // equivalently to "some fresh name". They correspond to
-            // early-bound regions on an impl, in other words.
+            // It might seem surprising that `Fresh` counts as not *elided*
+            // -- but this is because, as far as the code in the compiler is
+            // concerned -- `Fresh` variants act equivalently to "some fresh name".
+            // They correspond to early-bound regions on an impl, in other words.
             LifetimeName::Error | LifetimeName::Param(..) | LifetimeName::Static => false,
         }
     }

Diff for: compiler/rustc_passes/src/check_attr.rs

@@ -1666,7 +1666,8 @@ impl CheckAttrVisitor<'_> {
                         E0552,
                         "unrecognized representation hint"
                     )
-                    .help("valid reprs are `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`")
+                    .help("valid reprs are `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, \
+                          `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`")
                     .emit();
 
                     continue;

Diff for: compiler/rustc_symbol_mangling/src/errors.rs

@@ -1,36 +1,34 @@
 //! Errors emitted by symbol_mangling.
 
+use rustc_errors::{DiagnosticArgValue, IntoDiagnosticArg};
 use rustc_macros::SessionDiagnostic;
 use rustc_span::Span;
 
 #[derive(SessionDiagnostic)]
-#[diag(symbol_mangling::invalid_symbol_name)]
-pub struct InvalidSymbolName {
+#[diag(symbol_mangling::test_output)]
+pub struct TestOutput {
     #[primary_span]
     pub span: Span,
-    pub mangled_formatted: String,
+    pub kind: Kind,
+    pub content: String,
 }
 
-#[derive(SessionDiagnostic)]
-#[diag(symbol_mangling::invalid_trait_item)]
-pub struct InvalidTraitItem {
-    #[primary_span]
-    pub span: Span,
-    pub demangling_formatted: String,
+pub enum Kind {
+    SymbolName,
+    Demangling,
+    DemanglingAlt,
+    DefPath,
 }
 
-#[derive(SessionDiagnostic)]
-#[diag(symbol_mangling::alt_invalid_trait_item)]
-pub struct AltInvalidTraitItem {
-    #[primary_span]
-    pub span: Span,
-    pub alt_demangling_formatted: String,
-}
-
-#[derive(SessionDiagnostic)]
-#[diag(symbol_mangling::invalid_def_path)]
-pub struct InvalidDefPath {
-    #[primary_span]
-    pub span: Span,
-    pub def_path: String,
+impl IntoDiagnosticArg for Kind {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+        let kind = match self {
+            Kind::SymbolName => "symbol-name",
+            Kind::Demangling => "demangling",
+            Kind::DemanglingAlt => "demangling-alt",
+            Kind::DefPath => "def-path",
+        }
+        .into();
+        DiagnosticArgValue::Str(kind)
+    }
 }

Diff for: compiler/rustc_symbol_mangling/src/test.rs

@@ -4,7 +4,7 @@
 //! def-path. This is used for unit testing the code that generates
 //! paths etc in all kinds of annoying scenarios.
 
-use crate::errors::{AltInvalidTraitItem, InvalidDefPath, InvalidSymbolName, InvalidTraitItem};
+use crate::errors::{Kind, TestOutput};
 use rustc_hir::def_id::LocalDefId;
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::{subst::InternalSubsts, Instance, TyCtxt};
@@ -60,26 +60,30 @@ impl SymbolNamesTest<'_> {
                 tcx.erase_regions(InternalSubsts::identity_for_item(tcx, def_id)),
             );
             let mangled = tcx.symbol_name(instance);
-            tcx.sess.emit_err(InvalidSymbolName {
+            tcx.sess.emit_err(TestOutput {
                 span: attr.span,
-                mangled_formatted: format!("{mangled}"),
+                kind: Kind::SymbolName,
+                content: format!("{mangled}"),
             });
             if let Ok(demangling) = rustc_demangle::try_demangle(mangled.name) {
-                tcx.sess.emit_err(InvalidTraitItem {
+                tcx.sess.emit_err(TestOutput {
                     span: attr.span,
-                    demangling_formatted: format!("{demangling}"),
+                    kind: Kind::Demangling,
+                    content: format!("{demangling}"),
                 });
-                tcx.sess.emit_err(AltInvalidTraitItem {
+                tcx.sess.emit_err(TestOutput {
                     span: attr.span,
-                    alt_demangling_formatted: format!("{:#}", demangling),
+                    kind: Kind::DemanglingAlt,
+                    content: format!("{:#}", demangling),
                 });
             }
         }
 
         for attr in tcx.get_attrs(def_id.to_def_id(), DEF_PATH) {
-            tcx.sess.emit_err(InvalidDefPath {
+            tcx.sess.emit_err(TestOutput {
                 span: attr.span,
-                def_path: with_no_trimmed_paths!(tcx.def_path_str(def_id.to_def_id())),
+                kind: Kind::DefPath,
+                content: with_no_trimmed_paths!(tcx.def_path_str(def_id.to_def_id())),
             });
         }
     }

Diff for: src/bootstrap/bin/rustc.rs

@@ -139,10 +139,8 @@ fn main() {
         // Cargo doesn't pass RUSTFLAGS to proc_macros:
         // https://github.com/rust-lang/cargo/issues/4423
         // Thus, if we are on stage 0, we explicitly set `--cfg=bootstrap`.
-        // We also declare that the flag is expected, which is mainly needed for
-        // later stages so that they don't warn about #[cfg(bootstrap)],
-        // but enabling it for stage 0 too lets any warnings, if they occur,
-        // occur more early on, e.g. about #[cfg(bootstrap = "foo")].
+        // We also declare that the flag is expected, which we need to do to not
+        // get warnings about it being unexpected.
         if stage == "0" {
             cmd.arg("--cfg=bootstrap");
         }

Diff for: src/bootstrap/bin/rustdoc.rs

@@ -11,6 +11,7 @@ include!("../dylib_util.rs");
 
 fn main() {
     let args = env::args_os().skip(1).collect::<Vec<_>>();
+    let stage = env::var("RUSTC_STAGE").expect("RUSTC_STAGE was not set");
     let rustdoc = env::var_os("RUSTDOC_REAL").expect("RUSTDOC_REAL was not set");
     let libdir = env::var_os("RUSTDOC_LIBDIR").expect("RUSTDOC_LIBDIR was not set");
     let sysroot = env::var_os("RUSTC_SYSROOT").expect("RUSTC_SYSROOT was not set");
@@ -62,6 +63,16 @@ fn main() {
             cmd.arg("-Clink-arg=-Wl,--threads=1");
         }
     }
+    // Cargo doesn't pass RUSTDOCFLAGS to proc_macros:
+    // https://github.com/rust-lang/cargo/issues/4423
+    // Thus, if we are on stage 0, we explicitly set `--cfg=bootstrap`.
+    // We also declare that the flag is expected, which we need to do to not
+    // get warnings about it being unexpected.
+    if stage == "0" {
+        cmd.arg("--cfg=bootstrap");
+    }
+    cmd.arg("-Zunstable-options");
+    cmd.arg("--check-cfg=values(bootstrap)");
 
     if verbose > 1 {
         eprintln!(