Auto merge of #87095 - JohnTitor:rollup-mn7ggy2, r=JohnTitor

Rollup of 11 pull requests

Successful merges:

 - #86344 (Split MaybeUninit::write into new feature gate and stabilize it)
 - #86811 (Remove unstable `io::Cursor::remaining`)
 - #86846 (stdio_locked: add tracking issue)
 - #86887 (rustdoc: remove dead code in `clean`)
 - #87007 (Fix rust-analyzer install when not available.)
 - #87035 (Fix implementors display)
 - #87065 (Fix ICE with unsized type in const pattern)
 - #87070 (Simplify future incompatible reporting.)
 - #87077 (:arrow_up: rust-analyzer)
 - #87078 (Rustdoc: suggest removing disambiguator if linking to field)
 - #87089 (CTFE engine: small cleanups)

Failed merges:

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

.gitignore

@@ -72,4 +72,7 @@ __pycache__/
 **node_modules
 **package-lock.json
 
+## Rustdoc GUI tests
+src/test/rustdoc-gui/src/**.lock
+
 # Before adding new lines, see the comment at the top.

compiler/rustc_errors/src/emitter.rs

@@ -9,7 +9,6 @@
 
 use Destination::*;
 
-use rustc_lint_defs::FutureBreakage;
 use rustc_span::source_map::SourceMap;
 use rustc_span::{MultiSpan, SourceFile, Span};
 
@@ -193,7 +192,7 @@ pub trait Emitter {
     /// other formats can, and will, simply ignore it.
     fn emit_artifact_notification(&mut self, _path: &Path, _artifact_type: &str) {}
 
-    fn emit_future_breakage_report(&mut self, _diags: Vec<(FutureBreakage, Diagnostic)>) {}
+    fn emit_future_breakage_report(&mut self, _diags: Vec<Diagnostic>) {}
 
     /// Emit list of unused externs
     fn emit_unused_externs(&mut self, _lint_level: &str, _unused_externs: &[&str]) {}

compiler/rustc_errors/src/json.rs

@@ -16,7 +16,7 @@ use crate::registry::Registry;
 use crate::DiagnosticId;
 use crate::ToolMetadata;
 use crate::{CodeSuggestion, SubDiagnostic};
-use rustc_lint_defs::{Applicability, FutureBreakage};
+use rustc_lint_defs::Applicability;
 
 use rustc_data_structures::sync::Lrc;
 use rustc_span::hygiene::ExpnData;
@@ -134,17 +134,14 @@ impl Emitter for JsonEmitter {
         }
     }
 
-    fn emit_future_breakage_report(&mut self, diags: Vec<(FutureBreakage, crate::Diagnostic)>) {
+    fn emit_future_breakage_report(&mut self, diags: Vec<crate::Diagnostic>) {
         let data: Vec<FutureBreakageItem> = diags
             .into_iter()
-            .map(|(breakage, mut diag)| {
+            .map(|mut diag| {
                 if diag.level == crate::Level::Allow {
                     diag.level = crate::Level::Warning;
                 }
-                FutureBreakageItem {
-                    future_breakage_date: breakage.date,
-                    diagnostic: Diagnostic::from_errors_diagnostic(&diag, self),
-                }
+                FutureBreakageItem { diagnostic: Diagnostic::from_errors_diagnostic(&diag, self) }
             })
             .collect();
         let report = FutureIncompatReport { future_incompat_report: data };
@@ -326,7 +323,6 @@ struct ArtifactNotification<'a> {
 
 #[derive(Encodable)]
 struct FutureBreakageItem {
-    future_breakage_date: Option<&'static str>,
     diagnostic: Diagnostic,
 }
 

compiler/rustc_errors/src/lib.rs

@@ -23,7 +23,6 @@ use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
 use rustc_data_structures::stable_hasher::StableHasher;
 use rustc_data_structures::sync::{self, Lock, Lrc};
 use rustc_data_structures::AtomicRef;
-use rustc_lint_defs::FutureBreakage;
 pub use rustc_lint_defs::{pluralize, Applicability};
 use rustc_serialize::json::Json;
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
@@ -790,7 +789,7 @@ impl Handler {
         self.inner.borrow_mut().emit_artifact_notification(path, artifact_type)
     }
 
-    pub fn emit_future_breakage_report(&self, diags: Vec<(FutureBreakage, Diagnostic)>) {
+    pub fn emit_future_breakage_report(&self, diags: Vec<Diagnostic>) {
         self.inner.borrow_mut().emitter.emit_future_breakage_report(diags)
     }
 

compiler/rustc_lint_defs/src/builtin.rs

@@ -6,7 +6,7 @@
 //! compiler code, rather than using their own custom pass. Those
 //! lints are all available in `rustc_lint::builtin`.
 
-use crate::{declare_lint, declare_lint_pass, FutureBreakage, FutureIncompatibilityReason};
+use crate::{declare_lint, declare_lint_pass, FutureIncompatibilityReason};
 use rustc_span::edition::Edition;
 
 declare_lint! {
@@ -3176,9 +3176,7 @@ declare_lint! {
     "detects usage of old versions of certain proc-macro crates",
     @future_incompatible = FutureIncompatibleInfo {
         reference: "issue #83125 <https://github.com/rust-lang/rust/issues/83125>",
-        future_breakage: Some(FutureBreakage {
-            date: None
-        })
+        reason: FutureIncompatibilityReason::FutureReleaseErrorReportNow,
     };
 }
 

compiler/rustc_lint_defs/src/lib.rs

@@ -152,10 +152,6 @@ pub struct FutureIncompatibleInfo {
     /// Set to false for lints that already include a more detailed
     /// explanation.
     pub explain_reason: bool,
-    /// Information about a future breakage, which will
-    /// be emitted in JSON messages to be displayed by Cargo
-    /// for upstream deps
-    pub future_breakage: Option<FutureBreakage>,
 }
 
 /// The reason for future incompatibility
@@ -164,6 +160,9 @@ pub enum FutureIncompatibilityReason {
     /// This will be an error in a future release
     /// for all editions
     FutureReleaseError,
+    /// This will be an error in a future release, and
+    /// Cargo should create a report even for dependencies
+    FutureReleaseErrorReportNow,
     /// Previously accepted code that will become an
     /// error in the provided edition
     EditionError(Edition),
@@ -182,18 +181,12 @@ impl FutureIncompatibilityReason {
     }
 }
 
-#[derive(Copy, Clone, Debug)]
-pub struct FutureBreakage {
-    pub date: Option<&'static str>,
-}
-
 impl FutureIncompatibleInfo {
     pub const fn default_fields_for_macro() -> Self {
         FutureIncompatibleInfo {
             reference: "",
             reason: FutureIncompatibilityReason::FutureReleaseError,
             explain_reason: true,
-            future_breakage: None,
         }
     }
 }

compiler/rustc_middle/src/lint.rs

@@ -8,7 +8,7 @@ use rustc_hir::HirId;
 use rustc_index::vec::IndexVec;
 use rustc_session::lint::{
     builtin::{self, FORBIDDEN_LINT_GROUPS},
-    FutureIncompatibilityReason, Level, Lint, LintId,
+    FutureIncompatibilityReason, FutureIncompatibleInfo, Level, Lint, LintId,
 };
 use rustc_session::{DiagnosticMessageId, Session};
 use rustc_span::hygiene::MacroKind;
@@ -223,8 +223,13 @@ pub fn struct_lint_level<'s, 'd>(
         let lint_id = LintId::of(lint);
         let future_incompatible = lint.future_incompatible;
 
-        let has_future_breakage =
-            future_incompatible.map_or(false, |incompat| incompat.future_breakage.is_some());
+        let has_future_breakage = matches!(
+            future_incompatible,
+            Some(FutureIncompatibleInfo {
+                reason: FutureIncompatibilityReason::FutureReleaseErrorReportNow,
+                ..
+            })
+        );
 
         let mut err = match (level, span) {
             (Level::Allow, span) => {

compiler/rustc_middle/src/mir/interpret/allocation.rs

@@ -512,7 +512,7 @@ impl InitMaskCompressed {
 /// Transferring the initialization mask to other allocations.
 impl<Tag, Extra> Allocation<Tag, Extra> {
     /// Creates a run-length encoding of the initialization mask.
-    pub fn compress_uninit_range(&self, src: Pointer<Tag>, size: Size) -> InitMaskCompressed {
+    pub fn compress_uninit_range(&self, range: AllocRange) -> InitMaskCompressed {
         // Since we are copying `size` bytes from `src` to `dest + i * size` (`for i in 0..repeat`),
         // a naive initialization mask copying algorithm would repeatedly have to read the initialization mask from
         // the source and write it to the destination. Even if we optimized the memory accesses,
@@ -526,13 +526,13 @@ impl<Tag, Extra> Allocation<Tag, Extra> {
         // where each element toggles the state.
 
         let mut ranges = smallvec::SmallVec::<[u64; 1]>::new();
-        let initial = self.init_mask.get(src.offset);
+        let initial = self.init_mask.get(range.start);
         let mut cur_len = 1;
         let mut cur = initial;
 
-        for i in 1..size.bytes() {
+        for i in 1..range.size.bytes() {
             // FIXME: optimize to bitshift the current uninitialized block's bits and read the top bit.
-            if self.init_mask.get(src.offset + Size::from_bytes(i)) == cur {
+            if self.init_mask.get(range.start + Size::from_bytes(i)) == cur {
                 cur_len += 1;
             } else {
                 ranges.push(cur_len);
@@ -550,24 +550,23 @@ impl<Tag, Extra> Allocation<Tag, Extra> {
     pub fn mark_compressed_init_range(
         &mut self,
         defined: &InitMaskCompressed,
-        dest: Pointer<Tag>,
-        size: Size,
+        range: AllocRange,
         repeat: u64,
     ) {
         // An optimization where we can just overwrite an entire range of initialization
         // bits if they are going to be uniformly `1` or `0`.
         if defined.ranges.len() <= 1 {
             self.init_mask.set_range_inbounds(
-                dest.offset,
-                dest.offset + size * repeat, // `Size` operations
+                range.start,
+                range.start + range.size * repeat, // `Size` operations
                 defined.initial,
             );
             return;
         }
 
         for mut j in 0..repeat {
-            j *= size.bytes();
-            j += dest.offset.bytes();
+            j *= range.size.bytes();
+            j += range.start.bytes();
             let mut cur = defined.initial;
             for range in &defined.ranges {
                 let old_j = j;

compiler/rustc_mir/src/interpret/eval_context.rs

@@ -18,8 +18,8 @@ use rustc_span::{Pos, Span};
 use rustc_target::abi::{Align, HasDataLayout, LayoutOf, Size, TargetDataLayout};
 
 use super::{
-    Immediate, MPlaceTy, Machine, MemPlace, MemPlaceMeta, Memory, Operand, Place, PlaceTy,
-    ScalarMaybeUninit, StackPopJump,
+    Immediate, MPlaceTy, Machine, MemPlace, MemPlaceMeta, Memory, MemoryKind, Operand, Place,
+    PlaceTy, ScalarMaybeUninit, StackPopJump,
 };
 use crate::transform::validate::equal_up_to_regions;
 use crate::util::storage::AlwaysLiveLocals;
@@ -900,7 +900,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             // due to the local having ZST type.
             let ptr = ptr.assert_ptr();
             trace!("deallocating local: {:?}", self.memory.dump_alloc(ptr.alloc_id));
-            self.memory.deallocate_local(ptr)?;
+            self.memory.deallocate(ptr, None, MemoryKind::Stack)?;
         };
         Ok(())
     }

compiler/rustc_mir/src/interpret/memory.rs

@@ -276,17 +276,6 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> Memory<'mir, 'tcx, M> {
         Ok(new_ptr)
     }
 
-    /// Deallocate a local, or do nothing if that local has been made into a global.
-    pub fn deallocate_local(&mut self, ptr: Pointer<M::PointerTag>) -> InterpResult<'tcx> {
-        // The allocation might be already removed by global interning.
-        // This can only really happen in the CTFE instance, not in miri.
-        if self.alloc_map.contains_key(&ptr.alloc_id) {
-            self.deallocate(ptr, None, MemoryKind::Stack)
-        } else {
-            Ok(())
-        }
-    }
-
     pub fn deallocate(
         &mut self,
         ptr: Pointer<M::PointerTag>,
@@ -1049,7 +1038,7 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> Memory<'mir, 'tcx, M> {
             num_copies,
         );
         // Prepare a copy of the initialization mask.
-        let compressed = src_alloc.compress_uninit_range(src, size);
+        let compressed = src_alloc.compress_uninit_range(alloc_range(src.offset, size));
         // This checks relocation edges on the src.
         let src_bytes = src_alloc
             .get_bytes_with_uninit_and_ptr(&tcx, alloc_range(src.offset, size))
@@ -1110,7 +1099,11 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> Memory<'mir, 'tcx, M> {
         }
 
         // now fill in all the "init" data
-        dest_alloc.mark_compressed_init_range(&compressed, dest, size, num_copies);
+        dest_alloc.mark_compressed_init_range(
+            &compressed,
+            alloc_range(dest.offset, size),
+            num_copies,
+        );
         // copy the relocations to the destination
         dest_alloc.mark_relocation_range(relocations);
 

compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs

@@ -490,17 +490,29 @@ impl<'a, 'tcx> ConstToPat<'a, 'tcx> {
                 // convert the dereferenced constant to a pattern that is the sub-pattern of the
                 // deref pattern.
                 _ => {
-                    let old = self.behind_reference.replace(true);
-                    // In case there are structural-match violations somewhere in this subpattern,
-                    // we fall back to a const pattern. If we do not do this, we may end up with
-                    // a !structural-match constant that is not of reference type, which makes it
-                    // very hard to invoke `PartialEq::eq` on it as a fallback.
-                    let val = match self.recur(tcx.deref_const(self.param_env.and(cv)), false) {
-                        Ok(subpattern) => PatKind::Deref { subpattern },
-                        Err(_) => PatKind::Constant { value: cv },
-                    };
-                    self.behind_reference.set(old);
-                    val
+                    if !pointee_ty.is_sized(tcx.at(span), param_env) {
+                        // `tcx.deref_const()` below will ICE with an unsized type
+                        // (except slices, which are handled in a separate arm above).
+                        let msg = format!("cannot use unsized non-slice type `{}` in constant patterns", pointee_ty);
+                        if self.include_lint_checks {
+                            tcx.sess.span_err(span, &msg);
+                        } else {
+                            tcx.sess.delay_span_bug(span, &msg);
+                        }
+                        PatKind::Wild
+                    } else {
+                        let old = self.behind_reference.replace(true);
+                        // In case there are structural-match violations somewhere in this subpattern,
+                        // we fall back to a const pattern. If we do not do this, we may end up with
+                        // a !structural-match constant that is not of reference type, which makes it
+                        // very hard to invoke `PartialEq::eq` on it as a fallback.
+                        let val = match self.recur(tcx.deref_const(self.param_env.and(cv)), false) {
+                            Ok(subpattern) => PatKind::Deref { subpattern },
+                            Err(_) => PatKind::Constant { value: cv },
+                        };
+                        self.behind_reference.set(old);
+                        val
+                    }
                 }
             },
             ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::FnDef(..) => {

compiler/rustc_session/src/session.rs

@@ -20,8 +20,7 @@ use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitterWriter;
 use rustc_errors::emitter::{Emitter, EmitterWriter, HumanReadableErrorType};
 use rustc_errors::json::JsonEmitter;
 use rustc_errors::registry::Registry;
-use rustc_errors::{Diagnostic, DiagnosticBuilder, DiagnosticId, ErrorReported};
-use rustc_lint_defs::FutureBreakage;
+use rustc_errors::{DiagnosticBuilder, DiagnosticId, ErrorReported};
 use rustc_macros::HashStable_Generic;
 pub use rustc_span::def_id::StableCrateId;
 use rustc_span::source_map::{FileLoader, MultiSpan, RealFileLoader, SourceMap, Span};
@@ -317,23 +316,7 @@ impl Session {
         if diags.is_empty() {
             return;
         }
-        // If any future-breakage lints were registered, this lint store
-        // should be available
-        let lint_store = self.lint_store.get().expect("`lint_store` not initialized!");
-        let diags_and_breakage: Vec<(FutureBreakage, Diagnostic)> = diags
-            .into_iter()
-            .map(|diag| {
-                let lint_name = match &diag.code {
-                    Some(DiagnosticId::Lint { name, has_future_breakage: true, .. }) => name,
-                    _ => panic!("Unexpected code in diagnostic {:?}", diag),
-                };
-                let lint = lint_store.name_to_lint(&lint_name);
-                let future_breakage =
-                    lint.lint.future_incompatible.unwrap().future_breakage.unwrap();
-                (future_breakage, diag)
-            })
-            .collect();
-        self.parse_sess.span_diagnostic.emit_future_breakage_report(diags_and_breakage);
+        self.parse_sess.span_diagnostic.emit_future_breakage_report(diags);
     }
 
     pub fn local_stable_crate_id(&self) -> StableCrateId {