Auto merge of #87182 - GuillaumeGomez:rollup-whwohua, r=GuillaumeGomez

Rollup of 7 pull requests

Successful merges:

 - #86983 (Add or improve natvis definitions for common standard library types)
 - #87069 (ExprUseVisitor: Treat ByValue use of Copy types as ImmBorrow)
 - #87138 (Correct invariant documentation for `steps_between`)
 - #87145 (Make --cap-lints and related options leave crate hash alone)
 - #87161 (RFC2229: Use the correct place type)
 - #87162 (Fix type decl layout "overflow")
 - #87167 (Fix sidebar display on small devices)

Failed merges:

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

Author: bors

Diff for: compiler/rustc_interface/src/tests.rs

@@ -236,9 +236,9 @@ fn test_lints_tracking_hash_different_values() {
         (String::from("d"), Level::Deny),
     ];
 
-    assert_different_hash(&v1, &v2);
-    assert_different_hash(&v1, &v3);
-    assert_different_hash(&v2, &v3);
+    assert_non_crate_hash_different(&v1, &v2);
+    assert_non_crate_hash_different(&v1, &v3);
+    assert_non_crate_hash_different(&v2, &v3);
 }
 
 #[test]
@@ -261,7 +261,21 @@ fn test_lints_tracking_hash_different_construction_order() {
     ];
 
     // The hash should be order-dependent
-    assert_different_hash(&v1, &v2);
+    assert_non_crate_hash_different(&v1, &v2);
+}
+
+#[test]
+fn test_lint_cap_hash_different() {
+    let mut v1 = Options::default();
+    let mut v2 = Options::default();
+    let v3 = Options::default();
+
+    v1.lint_cap = Some(Level::Forbid);
+    v2.lint_cap = Some(Level::Allow);
+
+    assert_non_crate_hash_different(&v1, &v2);
+    assert_non_crate_hash_different(&v1, &v3);
+    assert_non_crate_hash_different(&v2, &v3);
 }
 
 #[test]

Diff for: compiler/rustc_session/src/options.rs

@@ -133,9 +133,9 @@ top_level_options!(
         /// can influence whether overflow checks are done or not.
         debug_assertions: bool [TRACKED],
         debuginfo: DebugInfo [TRACKED],
-        lint_opts: Vec<(String, lint::Level)> [TRACKED],
-        lint_cap: Option<lint::Level> [TRACKED],
-        force_warns: Vec<String> [TRACKED],
+        lint_opts: Vec<(String, lint::Level)> [TRACKED_NO_CRATE_HASH],
+        lint_cap: Option<lint::Level> [TRACKED_NO_CRATE_HASH],
+        force_warns: Vec<String> [TRACKED_NO_CRATE_HASH],
         describe_lints: bool [UNTRACKED],
         output_types: OutputTypes [TRACKED],
         search_paths: Vec<SearchPath> [UNTRACKED],

Diff for: compiler/rustc_typeck/src/check/upvar.rs

@@ -1528,20 +1528,11 @@ impl<'a, 'tcx> InferBorrowKind<'a, 'tcx> {
         &mut self,
         place_with_id: &PlaceWithHirId<'tcx>,
         diag_expr_id: hir::HirId,
-        mode: euv::ConsumeMode,
     ) {
         debug!(
-            "adjust_upvar_borrow_kind_for_consume(place_with_id={:?}, diag_expr_id={:?}, mode={:?})",
-            place_with_id, diag_expr_id, mode
+            "adjust_upvar_borrow_kind_for_consume(place_with_id={:?}, diag_expr_id={:?})",
+            place_with_id, diag_expr_id
         );
-
-        // Copy type being used as ByValue are equivalent to ImmBorrow and don't require any
-        // escalation.
-        match mode {
-            euv::ConsumeMode::Copy => return,
-            euv::ConsumeMode::Move => {}
-        };
-
         let tcx = self.fcx.tcx;
         let upvar_id = if let PlaceBase::Upvar(upvar_id) = place_with_id.place.base {
             upvar_id
@@ -1716,22 +1707,14 @@ impl<'a, 'tcx> euv::Delegate<'tcx> for InferBorrowKind<'a, 'tcx> {
         }
     }
 
-    fn consume(
-        &mut self,
-        place_with_id: &PlaceWithHirId<'tcx>,
-        diag_expr_id: hir::HirId,
-        mode: euv::ConsumeMode,
-    ) {
-        debug!(
-            "consume(place_with_id={:?}, diag_expr_id={:?}, mode={:?})",
-            place_with_id, diag_expr_id, mode
-        );
+    fn consume(&mut self, place_with_id: &PlaceWithHirId<'tcx>, diag_expr_id: hir::HirId) {
+        debug!("consume(place_with_id={:?}, diag_expr_id={:?})", place_with_id, diag_expr_id);
 
         if !self.capture_information.contains_key(&place_with_id.place) {
             self.init_capture_info_for_place(&place_with_id, diag_expr_id);
         }
 
-        self.adjust_upvar_borrow_kind_for_consume(&place_with_id, diag_expr_id, mode);
+        self.adjust_upvar_borrow_kind_for_consume(&place_with_id, diag_expr_id);
     }
 
     fn borrow(

Diff for: compiler/rustc_typeck/src/expr_use_visitor.rs

@@ -2,8 +2,6 @@
 //! normal visitor, which just walks the entire body in one shot, the
 //! `ExprUseVisitor` determines how expressions are being used.
 
-pub use self::ConsumeMode::*;
-
 // Export these here so that Clippy can use them.
 pub use rustc_middle::hir::place::{Place, PlaceBase, PlaceWithHirId, Projection};
 
@@ -28,19 +26,20 @@ use crate::mem_categorization as mc;
 /// This trait defines the callbacks you can expect to receive when
 /// employing the ExprUseVisitor.
 pub trait Delegate<'tcx> {
-    // The value found at `place` is either copied or moved, depending
+    // The value found at `place` is moved, depending
     // on `mode`. Where `diag_expr_id` is the id used for diagnostics for `place`.
     //
+    // Use of a `Copy` type in a ByValue context is considered a use
+    // by `ImmBorrow` and `borrow` is called instead. This is because
+    // a shared borrow is the "minimum access" that would be needed
+    // to perform a copy.
+    //
+    //
     // The parameter `diag_expr_id` indicates the HIR id that ought to be used for
     // diagnostics. Around pattern matching such as `let pat = expr`, the diagnostic
     // id will be the id of the expression `expr` but the place itself will have
     // the id of the binding in the pattern `pat`.
-    fn consume(
-        &mut self,
-        place_with_id: &PlaceWithHirId<'tcx>,
-        diag_expr_id: hir::HirId,
-        mode: ConsumeMode,
-    );
+    fn consume(&mut self, place_with_id: &PlaceWithHirId<'tcx>, diag_expr_id: hir::HirId);
 
     // The value found at `place` is being borrowed with kind `bk`.
     // `diag_expr_id` is the id used for diagnostics (see `consume` for more details).
@@ -60,7 +59,7 @@ pub trait Delegate<'tcx> {
 }
 
 #[derive(Copy, Clone, PartialEq, Debug)]
-pub enum ConsumeMode {
+enum ConsumeMode {
     Copy, // reference to x where x has a type that copies
     Move, // reference to x where x has a type that moves
 }
@@ -141,10 +140,7 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
     }
 
     fn delegate_consume(&mut self, place_with_id: &PlaceWithHirId<'tcx>, diag_expr_id: hir::HirId) {
-        debug!("delegate_consume(place_with_id={:?})", place_with_id);
-
-        let mode = copy_or_move(&self.mc, place_with_id);
-        self.delegate.consume(place_with_id, diag_expr_id, mode);
+        delegate_consume(&self.mc, self.delegate, place_with_id, diag_expr_id)
     }
 
     fn consume_exprs(&mut self, exprs: &[hir::Expr<'_>]) {
@@ -256,12 +252,16 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
                             | PatKind::Path(..)
                             | PatKind::Struct(..)
                             | PatKind::Tuple(..) => {
-                                // If the PatKind is a TupleStruct, Struct or Tuple then we want to check
+                                // If the PatKind is a TupleStruct, Path, Struct or Tuple then we want to check
                                 // whether the Variant is a MultiVariant or a SingleVariant. We only want
                                 // to borrow discr if it is a MultiVariant.
                                 // If it is a SingleVariant and creates a binding we will handle that when
                                 // this callback gets called again.
-                                if let ty::Adt(def, _) = place.place.base_ty.kind() {
+
+                                // Get the type of the Place after all projections have been applied
+                                let place_ty = place.place.ty();
+
+                                if let ty::Adt(def, _) = place_ty.kind() {
                                     if def.variants.len() > 1 {
                                         needs_to_be_read = true;
                                     }
@@ -653,9 +653,8 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
                             delegate.borrow(place, discr_place.hir_id, bk);
                         }
                         ty::BindByValue(..) => {
-                            let mode = copy_or_move(mc, &place);
                             debug!("walk_pat binding consuming pat");
-                            delegate.consume(place, discr_place.hir_id, mode);
+                            delegate_consume(mc, *delegate, place, discr_place.hir_id);
                         }
                     }
                 }
@@ -773,8 +772,7 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
 
                     match capture_info.capture_kind {
                         ty::UpvarCapture::ByValue(_) => {
-                            let mode = copy_or_move(&self.mc, &place_with_id);
-                            self.delegate.consume(&place_with_id, place_with_id.hir_id, mode);
+                            self.delegate_consume(&place_with_id, place_with_id.hir_id);
                         }
                         ty::UpvarCapture::ByRef(upvar_borrow) => {
                             self.delegate.borrow(
@@ -798,8 +796,28 @@ fn copy_or_move<'a, 'tcx>(
         place_with_id.place.ty(),
         mc.tcx().hir().span(place_with_id.hir_id),
     ) {
-        Move
+        ConsumeMode::Move
     } else {
-        Copy
+        ConsumeMode::Copy
+    }
+}
+
+// - If a place is used in a `ByValue` context then move it if it's not a `Copy` type.
+// - If the place that is a `Copy` type consider it a `ImmBorrow`.
+fn delegate_consume<'a, 'tcx>(
+    mc: &mc::MemCategorizationContext<'a, 'tcx>,
+    delegate: &mut (dyn Delegate<'tcx> + 'a),
+    place_with_id: &PlaceWithHirId<'tcx>,
+    diag_expr_id: hir::HirId,
+) {
+    debug!("delegate_consume(place_with_id={:?})", place_with_id);
+
+    let mode = copy_or_move(&mc, place_with_id);
+
+    match mode {
+        ConsumeMode::Move => delegate.consume(place_with_id, diag_expr_id),
+        ConsumeMode::Copy => {
+            delegate.borrow(place_with_id, diag_expr_id, ty::BorrowKind::ImmBorrow)
+        }
     }
 }

Diff for: library/core/src/iter/range.rs

@@ -30,7 +30,7 @@ pub trait Step: Clone + PartialOrd + Sized {
     /// For any `a`, `b`, and `n`:
     ///
     /// * `steps_between(&a, &b) == Some(n)` if and only if `Step::forward_checked(&a, n) == Some(b)`
-    /// * `steps_between(&a, &b) == Some(n)` if and only if `Step::backward_checked(&a, n) == Some(a)`
+    /// * `steps_between(&a, &b) == Some(n)` if and only if `Step::backward_checked(&b, n) == Some(a)`
     /// * `steps_between(&a, &b) == Some(n)` only if `a <= b`
     ///   * Corollary: `steps_between(&a, &b) == Some(0)` if and only if `a == b`
     ///   * Note that `a <= b` does _not_ imply `steps_between(&a, &b) != None`;

Diff for: src/etc/natvis/intrinsic.natvis

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
   <Type Name="str">
-    <DisplayString>{data_ptr,[length]s8}</DisplayString>
-    <StringView>data_ptr,[length]s8</StringView>
+    <DisplayString>{(char*)data_ptr,[length]s8}</DisplayString>
+    <StringView>(char*)data_ptr,[length]s8</StringView>
     <Expand>
       <Item Name="[len]" ExcludeView="simple">length</Item>
       <Synthetic Name="[chars]">

Diff for: src/etc/natvis/liballoc.natvis

@@ -48,6 +48,7 @@
       <Item Name="[len]" ExcludeView="simple">vec.len</Item>
       <Item Name="[capacity]" ExcludeView="simple">vec.buf.cap</Item>
       <Synthetic Name="[chars]">
+        <DisplayString>{(char*)vec.buf.ptr.pointer,[vec.len]s8}</DisplayString>
         <Expand>
           <ArrayItems>
             <Size>vec.len</Size>
@@ -57,22 +58,38 @@
       </Synthetic>
     </Expand>
   </Type>
+
   <Type Name="alloc::rc::Rc&lt;*&gt;">
     <DisplayString>{ptr.pointer->value}</DisplayString>
     <Expand>
       <ExpandedItem>ptr.pointer->value</ExpandedItem>
+      <Item Name="[Reference count]">ptr.pointer->strong</Item>
+      <Item Name="[Weak reference count]">ptr.pointer->weak</Item>
     </Expand>
   </Type>
+  <Type Name="alloc::rc::Weak&lt;*&gt;">
+    <DisplayString>{ptr.pointer->value}</DisplayString>
+    <Expand>
+      <ExpandedItem>ptr.pointer->value</ExpandedItem>
+      <Item Name="[Reference count]">ptr.pointer->strong</Item>
+      <Item Name="[Weak reference count]">ptr.pointer->weak</Item>
+    </Expand>
+  </Type>
+
   <Type Name="alloc::sync::Arc&lt;*&gt;">
     <DisplayString>{ptr.pointer->data}</DisplayString>
     <Expand>
       <ExpandedItem>ptr.pointer->data</ExpandedItem>
+      <Item Name="[Reference count]">ptr.pointer->strong</Item>
+      <Item Name="[Weak reference count]">ptr.pointer->weak</Item>
     </Expand>
   </Type>
   <Type Name="alloc::sync::Weak&lt;*&gt;">
     <DisplayString>{ptr.pointer->data}</DisplayString>
     <Expand>
       <ExpandedItem>ptr.pointer->data</ExpandedItem>
+      <Item Name="[Reference count]">ptr.pointer->strong</Item>
+      <Item Name="[Weak reference count]">ptr.pointer->weak</Item>
     </Expand>
   </Type>
   <Type Name="alloc::borrow::Cow&lt;*&gt;">