Rollup of 7 pull requests

Cargo.lock

@@ -1578,6 +1578,13 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "html-checker"
+version = "0.1.0"
+dependencies = [
+ "walkdir",
+]
+
 [[package]]
 name = "html5ever"
 version = "0.25.1"
@@ -2433,9 +2440,9 @@ dependencies = [
 
 [[package]]
 name = "openssl"
-version = "0.10.33"
+version = "0.10.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a61075b62a23fef5a29815de7536d940aa35ce96d18ce0cc5076272db678a577"
+checksum = "549430950c79ae24e6d02e0b7404534ecf311d94cc9f861e9e4020187d13d885"
 dependencies = [
  "bitflags",
  "cfg-if 1.0.0",
@@ -2462,9 +2469,9 @@ dependencies = [
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.61"
+version = "0.9.65"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "313752393519e876837e09e1fa183ddef0be7735868dced3196f4472d536277f"
+checksum = "7a7907e3bfa08bb85105209cdfcb6c63d109f8f6c1ed6ca318fff5c1853fbc1d"
 dependencies = [
  "autocfg",
  "cc",

Cargo.toml

@@ -34,6 +34,7 @@ members = [
   "src/tools/unicode-table-generator",
   "src/tools/expand-yaml-anchors",
   "src/tools/jsondocck",
+  "src/tools/html-checker",
 ]
 
 exclude = [

compiler/rustc_lint/src/non_fmt_panic.rs

@@ -4,6 +4,8 @@ use rustc_errors::{pluralize, Applicability};
 use rustc_hir as hir;
 use rustc_middle::ty;
 use rustc_parse_format::{ParseMode, Parser, Piece};
+use rustc_session::lint::FutureIncompatibilityReason;
+use rustc_span::edition::Edition;
 use rustc_span::{hygiene, sym, symbol::kw, symbol::SymbolStr, InnerSpan, Span, Symbol};
 
 declare_lint! {
@@ -30,6 +32,10 @@ declare_lint! {
     NON_FMT_PANIC,
     Warn,
     "detect single-argument panic!() invocations in which the argument is not a format string",
+    @future_incompatible = FutureIncompatibleInfo {
+        reason: FutureIncompatibilityReason::EditionSemanticsChange(Edition::Edition2021),
+        explain_reason: false,
+    };
     report_in_external_macro
 }
 
@@ -87,7 +93,8 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
 
     cx.struct_span_lint(NON_FMT_PANIC, arg_span, |lint| {
         let mut l = lint.build("panic message is not a string literal");
-        l.note("this is no longer accepted in Rust 2021");
+        l.note("this usage of panic!() is deprecated; it will be a hard error in Rust 2021");
+        l.note("for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>");
         if !span.contains(arg_span) {
             // No clue where this argument is coming from.
             l.emit();

compiler/rustc_lint_defs/src/builtin.rs

@@ -3002,8 +3002,7 @@ declare_lint! {
 
 declare_lint! {
     /// The `disjoint_capture_migration` lint detects variables that aren't completely
-    /// captured when the feature `capture_disjoint_fields` is enabled and it affects the Drop
-    /// order of at least one path starting at this variable.
+    /// captured in Rust 2021 and affect the Drop order of at least one path starting at this variable.
     /// It can also detect when a variable implements a trait, but one of its field does not and
     /// the field is captured by a closure and used with the assumption that said field implements
     /// the same trait as the root variable.
@@ -3040,16 +3039,16 @@ declare_lint! {
     ///
     /// ### Explanation
     ///
-    /// In the above example `p.y` will be dropped at the end of `f` instead of with `c` if
-    /// the feature `capture_disjoint_fields` is enabled.
+    /// In the above example, `p.y` will be dropped at the end of `f` instead of
+    /// with `c` in Rust 2021.
     ///
     /// ### Example of auto-trait
     ///
     /// ```rust,compile_fail
     /// #![deny(disjoint_capture_migration)]
     /// use std::thread;
     ///
-    /// struct Pointer (*mut i32);
+    /// struct Pointer(*mut i32);
     /// unsafe impl Send for Pointer {}
     ///
     /// fn main() {
@@ -3065,12 +3064,16 @@ declare_lint! {
     ///
     /// ### Explanation
     ///
-    /// In the above example `fptr.0` is captured when feature `capture_disjoint_fields` is enabled.
+    /// In the above example, only `fptr.0` is captured in Rust 2021.
     /// The field is of type *mut i32 which doesn't implement Send, making the code invalid as the
     /// field cannot be sent between thread safely.
     pub DISJOINT_CAPTURE_MIGRATION,
     Allow,
-    "Drop reorder and auto traits error because of `capture_disjoint_fields`"
+    "detects closures affected by Rust 2021 changes",
+    @future_incompatible = FutureIncompatibleInfo {
+        reason: FutureIncompatibilityReason::EditionSemanticsChange(Edition::Edition2021),
+        explain_reason: false,
+    };
 }
 
 declare_lint_pass!(UnusedDocComment => [UNUSED_DOC_COMMENTS]);

compiler/rustc_lint_defs/src/lib.rs

@@ -145,6 +145,11 @@ pub struct FutureIncompatibleInfo {
     /// The reason for the lint used by diagnostics to provide
     /// the right help message
     pub reason: FutureIncompatibilityReason,
+    /// Whether to explain the reason to the user.
+    ///
+    /// 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
@@ -185,6 +190,7 @@ impl FutureIncompatibleInfo {
         FutureIncompatibleInfo {
             reference: "",
             reason: FutureIncompatibilityReason::FutureReleaseError,
+            explain_reason: true,
             future_breakage: None,
         }
     }

compiler/rustc_middle/src/lint.rs

@@ -398,9 +398,14 @@ pub fn struct_lint_level<'s, 'd>(
                  it will become a hard error in a future release!"
                     .to_owned()
             };
-            let citation = format!("for more information, see {}", future_incompatible.reference);
-            err.warn(&explanation);
-            err.note(&citation);
+            if future_incompatible.explain_reason {
+                err.warn(&explanation);
+            }
+            if !future_incompatible.reference.is_empty() {
+                let citation =
+                    format!("for more information, see {}", future_incompatible.reference);
+                err.note(&citation);
+            }
         }
 
         // Finally, run `decorate`. This function is also responsible for emitting the diagnostic.

compiler/rustc_mir_build/src/build/expr/as_place.rs

@@ -217,6 +217,10 @@ fn to_upvars_resolved_place_builder<'a, 'tcx>(
                 ty::ClosureKind::FnOnce => {}
             }
 
+            // We won't be building MIR if the closure wasn't local
+            let closure_hir_id = tcx.hir().local_def_id_to_hir_id(closure_def_id.expect_local());
+            let closure_span = tcx.hir().span(closure_hir_id);
+
             let (capture_index, capture) = if let Some(capture_details) =
                 find_capture_matching_projections(
                     typeck_results,
@@ -226,7 +230,7 @@ fn to_upvars_resolved_place_builder<'a, 'tcx>(
                 ) {
                 capture_details
             } else {
-                if !tcx.features().capture_disjoint_fields {
+                if !enable_precise_capture(tcx, closure_span) {
                     bug!(
                         "No associated capture found for {:?}[{:#?}] even though \
                             capture_disjoint_fields isn't enabled",
@@ -242,8 +246,7 @@ fn to_upvars_resolved_place_builder<'a, 'tcx>(
                 return Err(from_builder);
             };
 
-            let closure_ty = typeck_results
-                .node_type(tcx.hir().local_def_id_to_hir_id(closure_def_id.expect_local()));
+            let closure_ty = typeck_results.node_type(closure_hir_id);
 
             let substs = match closure_ty.kind() {
                 ty::Closure(_, substs) => ty::UpvarSubsts::Closure(substs),
@@ -780,3 +783,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         }
     }
 }
+
+/// Precise capture is enabled if the feature gate `capture_disjoint_fields` is enabled or if
+/// user is using Rust Edition 2021 or higher.
+fn enable_precise_capture(tcx: TyCtxt<'_>, closure_span: Span) -> bool {
+    tcx.features().capture_disjoint_fields || closure_span.rust_2021()
+}

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -1962,6 +1962,8 @@ impl<'tcx> LifetimeContext<'_, 'tcx> {
                                 hir::GenericParamKind::Type {
                                     synthetic: Some(hir::SyntheticTyParamKind::ImplTrait),
                                     ..
+                                } | hir::GenericParamKind::Lifetime {
+                                    kind: hir::LifetimeParamKind::Elided
                                 }
                             )
                         }) {

compiler/rustc_typeck/src/check/method/prelude2021.rs

@@ -57,6 +57,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             {
                 return;
             }
+
+            // if it's an inherent `self` method (not `&self` or `&mut self`), it will take
+            // precedence over the `TryInto` impl, and thus won't break in 2021 edition
+            if pick.autoderefs == 0 && pick.autoref_or_ptr_adjustment.is_none() {
+                return;
+            }
+
             // Inherent impls only require not relying on autoref and autoderef in order to
             // ensure that the trait implementation won't be used
             self.tcx.struct_span_lint_hir(

compiler/rustc_typeck/src/check/upvar.rs

@@ -495,11 +495,12 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 |lint| {
                     let mut diagnostics_builder = lint.build(
                         format!(
-                            "{} affected for closure because of `capture_disjoint_fields`",
+                            "{} will change in Rust 2021",
                             reasons
                         )
                         .as_str(),
                     );
+                    diagnostics_builder.note("for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/disjoint-capture-in-closures.html>");
                     let closure_body_span = self.tcx.hir().span(body_id.hir_id);
                     let (sugg, app) =
                         match self.tcx.sess.source_map().span_to_snippet(closure_body_span) {

src/bootstrap/builder.rs

@@ -450,6 +450,7 @@ impl<'a> Builder<'a> {
                 test::RustdocTheme,
                 test::RustdocUi,
                 test::RustdocJson,
+                test::HtmlCheck,
                 // Run bootstrap close to the end as it's unlikely to fail
                 test::Bootstrap,
                 // Run run-make last, since these won't pass without make on Windows

src/bootstrap/doc.rs

@@ -501,8 +501,8 @@ impl Step for Std {
 
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Rustc {
-    stage: u32,
-    target: TargetSelection,
+    pub stage: u32,
+    pub target: TargetSelection,
 }
 
 impl Step for Rustc {

src/bootstrap/test.rs

@@ -9,7 +9,7 @@ use std::fmt;
 use std::fs;
 use std::iter;
 use std::path::{Path, PathBuf};
-use std::process::Command;
+use std::process::{Command, Stdio};
 
 use build_helper::{self, output, t};
 
@@ -161,6 +161,49 @@ You can skip linkcheck with --exclude src/tools/linkchecker"
     }
 }
 
+fn check_if_tidy_is_installed() -> bool {
+    Command::new("tidy")
+        .arg("--version")
+        .stdout(Stdio::null())
+        .status()
+        .map_or(false, |status| status.success())
+}
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub struct HtmlCheck {
+    target: TargetSelection,
+}
+
+impl Step for HtmlCheck {
+    type Output = ();
+    const DEFAULT: bool = true;
+    const ONLY_HOSTS: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        let run = run.path("src/tools/html-checker");
+        run.lazy_default_condition(Box::new(check_if_tidy_is_installed))
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        run.builder.ensure(HtmlCheck { target: run.target });
+    }
+
+    fn run(self, builder: &Builder<'_>) {
+        if !check_if_tidy_is_installed() {
+            eprintln!("not running HTML-check tool because `tidy` is missing");
+            eprintln!(
+                "Note that `tidy` is not the in-tree `src/tools/tidy` but needs to be installed"
+            );
+            panic!("Cannot run html-check tests");
+        }
+        // Ensure that a few different kinds of documentation are available.
+        builder.default_doc(&[]);
+        builder.ensure(crate::doc::Rustc { target: self.target, stage: builder.top_stage });
+
+        try_run(builder, builder.tool_cmd(Tool::HtmlChecker).arg(builder.doc_out(self.target)));
+    }
+}
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Cargotest {
     stage: u32,

src/bootstrap/tool.rs

@@ -376,6 +376,7 @@ bootstrap_tool!(
     ExpandYamlAnchors, "src/tools/expand-yaml-anchors", "expand-yaml-anchors";
     LintDocs, "src/tools/lint-docs", "lint-docs";
     JsonDocCk, "src/tools/jsondocck", "jsondocck";
+    HtmlChecker, "src/tools/html-checker", "html-checker";
 );
 
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, Ord, PartialOrd)]

src/ci/docker/host-x86_64/x86_64-gnu-aux/Dockerfile

@@ -17,7 +17,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   libgl1-mesa-dev \
   llvm-dev \
   libfreetype6-dev \
-  libexpat1-dev
+  libexpat1-dev \
+  tidy
 
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh

src/ci/docker/host-x86_64/x86_64-gnu-tools/Dockerfile

@@ -12,7 +12,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   cmake \
   libssl-dev \
   sudo \
-  xz-utils
+  xz-utils \
+  tidy
 
 # Install dependencies for chromium browser
 RUN apt-get install -y \

src/test/ui/closures/2229_closure_analysis/arrays-completely-captured.rs

@@ -1,7 +1,4 @@
-#![feature(capture_disjoint_fields)]
-//~^ WARNING: the feature `capture_disjoint_fields` is incomplete
-//~| `#[warn(incomplete_features)]` on by default
-//~| see issue #53488 <https://github.com/rust-lang/rust/issues/53488>
+// edition:2021
 #![feature(rustc_attrs)]
 
 // Ensure that capture analysis results in arrays being completely captured.