Auto merge of #95889 - Dylan-DPC:rollup-1cmywu4, r=Dylan-DPC

Rollup of 7 pull requests

Successful merges:

 - #95566 (Avoid duplication of doc comments in `std::char` constants and functions)
 - #95784 (Suggest replacing `typeof(...)` with an actual type)
 - #95807 (Suggest adding a local for vector to fix borrowck errors)
 - #95849 (Check for git submodules in non-git source tree.)
 - #95852 (Fix missing space in lossy provenance cast lint)
 - #95857 (Allow multiple derefs to be splitted in deref_separator)
 - #95868 (rustdoc: Reduce allocations in a `html::markdown` function)

Failed merges:

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

Author: bors

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -785,13 +785,22 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         issued_borrow: &BorrowData<'tcx>,
         explanation: BorrowExplanation,
     ) {
-        let used_in_call =
-            matches!(explanation, BorrowExplanation::UsedLater(LaterUseKind::Call, _call_span, _));
+        let used_in_call = matches!(
+            explanation,
+            BorrowExplanation::UsedLater(LaterUseKind::Call | LaterUseKind::Other, _call_span, _)
+        );
         if !used_in_call {
             debug!("not later used in call");
             return;
         }
 
+        let use_span =
+            if let BorrowExplanation::UsedLater(LaterUseKind::Other, use_span, _) = explanation {
+                Some(use_span)
+            } else {
+                None
+            };
+
         let outer_call_loc =
             if let TwoPhaseActivation::ActivatedAt(loc) = issued_borrow.activation_location {
                 loc
@@ -835,7 +844,10 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         debug!("===> outer_call_loc = {:?}, inner_call_loc = {:?}", outer_call_loc, inner_call_loc);
 
         let inner_call_span = inner_call_term.source_info.span;
-        let outer_call_span = outer_call_stmt.either(|s| s.source_info, |t| t.source_info).span;
+        let outer_call_span = match use_span {
+            Some(span) => span,
+            None => outer_call_stmt.either(|s| s.source_info, |t| t.source_info).span,
+        };
         if outer_call_span == inner_call_span || !outer_call_span.contains(inner_call_span) {
             // FIXME: This stops the suggestion in some cases where it should be emitted.
             //        Fix the spans for those cases so it's emitted correctly.
@@ -845,8 +857,20 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             );
             return;
         }
-        err.span_help(inner_call_span, "try adding a local storing this argument...");
-        err.span_help(outer_call_span, "...and then using that local as the argument to this call");
+        err.span_help(
+            inner_call_span,
+            &format!(
+                "try adding a local storing this{}...",
+                if use_span.is_some() { "" } else { " argument" }
+            ),
+        );
+        err.span_help(
+            outer_call_span,
+            &format!(
+                "...and then using that local {}",
+                if use_span.is_some() { "here" } else { "as the argument to this call" }
+            ),
+        );
     }
 
     fn suggest_split_at_mut_if_applicable(
@@ -1912,10 +1936,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         } else {
             "cannot assign twice to immutable variable"
         };
-        if span != assigned_span {
-            if !from_arg {
-                err.span_label(assigned_span, format!("first assignment to {}", place_description));
-            }
+        if span != assigned_span && !from_arg {
+            err.span_label(assigned_span, format!("first assignment to {}", place_description));
         }
         if let Some(decl) = local_decl
             && let Some(name) = local_name

compiler/rustc_error_messages/locales/en-US/diagnostics.ftl

@@ -62,6 +62,7 @@ typeck-functional-record-update-on-non-struct =
 
 typeck-typeof-reserved-keyword-used =
     `typeof` is a reserved keyword but unimplemented
+    .suggestion = consider replacing `typeof(...)` with an actual type
     .label = reserved keyword
 
 typeck-return-stmt-outside-of-fn-body =

compiler/rustc_mir_transform/src/deref_separator.rs

@@ -11,6 +11,8 @@ pub fn deref_finder<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
         for (i, stmt) in data.statements.iter_mut().enumerate() {
             match stmt.kind {
                 StatementKind::Assign(box (og_place, Rvalue::Ref(region, borrow_knd, place))) => {
+                    let mut place_local = place.local;
+                    let mut last_len = 0;
                     for (idx, (p_ref, p_elem)) in place.iter_projections().enumerate() {
                         if p_elem == ProjectionElem::Deref && !p_ref.projection.is_empty() {
                             // The type that we are derefing.
@@ -23,15 +25,18 @@ pub fn deref_finder<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
                             patch.add_statement(loc, StatementKind::StorageLive(temp));
 
                             // We are adding current p_ref's projections to our
-                            // temp value.
-                            let deref_place =
-                                Place::from(p_ref.local).project_deeper(p_ref.projection, tcx);
+                            // temp value, excluding projections we already covered.
+                            let deref_place = Place::from(place_local)
+                                .project_deeper(&p_ref.projection[last_len..], tcx);
                             patch.add_assign(
                                 loc,
                                 Place::from(temp),
                                 Rvalue::Use(Operand::Move(deref_place)),
                             );
 
+                            place_local = temp;
+                            last_len = p_ref.projection.len();
+
                             // We are creating a place by using our temp value's location
                             // and copying derefed values which we need to create new statement.
                             let temp_place =
@@ -50,11 +55,6 @@ pub fn deref_finder<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
                             // Since our job with the temp is done it should be gone
                             let loc = Location { block: block, statement_index: i + 1 };
                             patch.add_statement(loc, StatementKind::StorageDead(temp));
-
-                            // As all projections are off the base projection, if there are
-                            // multiple derefs in the middle of projection, it might cause
-                            // unsoundness, to not let that happen we break the loop.
-                            break;
                         }
                     }
                 }

compiler/rustc_typeck/src/astconv/mod.rs

@@ -2460,8 +2460,16 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 self.normalize_ty(ast_ty.span, array_ty)
             }
             hir::TyKind::Typeof(ref e) => {
-                tcx.sess.emit_err(TypeofReservedKeywordUsed { span: ast_ty.span });
-                tcx.type_of(tcx.hir().local_def_id(e.hir_id))
+                let ty = tcx.type_of(tcx.hir().local_def_id(e.hir_id));
+                let span = ast_ty.span;
+                tcx.sess.emit_err(TypeofReservedKeywordUsed {
+                    span,
+                    ty,
+                    opt_sugg: Some((span, Applicability::MachineApplicable))
+                        .filter(|_| ty.is_suggestable()),
+                });
+
+                ty
             }
             hir::TyKind::Infer => {
                 // Infer also appears as the type of arguments or return

compiler/rustc_typeck/src/check/cast.rs

@@ -1012,7 +1012,7 @@ impl<'a, 'tcx> CastCheck<'tcx> {
                     err.help(msg);
                 }
                 err.help(
-                    "if you can't comply with strict provenance and need to expose the pointer\
+                    "if you can't comply with strict provenance and need to expose the pointer \
                     provenance you can use `.expose_addr()` instead"
                 );
 

compiler/rustc_typeck/src/errors.rs

@@ -1,5 +1,7 @@
 //! Errors emitted by typeck.
+use rustc_errors::Applicability;
 use rustc_macros::SessionDiagnostic;
+use rustc_middle::ty::Ty;
 use rustc_span::{symbol::Ident, Span, Symbol};
 
 #[derive(SessionDiagnostic)]
@@ -127,10 +129,13 @@ pub struct FunctionalRecordUpdateOnNonStruct {
 
 #[derive(SessionDiagnostic)]
 #[error(code = "E0516", slug = "typeck-typeof-reserved-keyword-used")]
-pub struct TypeofReservedKeywordUsed {
+pub struct TypeofReservedKeywordUsed<'tcx> {
+    pub ty: Ty<'tcx>,
     #[primary_span]
     #[label]
     pub span: Span,
+    #[suggestion_verbose(message = "suggestion", code = "{ty}")]
+    pub opt_sugg: Option<(Span, Applicability)>,
 }
 
 #[derive(SessionDiagnostic)]

library/core/src/char/convert.rs

@@ -6,97 +6,22 @@ use crate::fmt;
 use crate::mem::transmute;
 use crate::str::FromStr;
 
-/// Converts a `u32` to a `char`.
-///
-/// Note that all [`char`]s are valid [`u32`]s, and can be cast to one with
-/// `as`:
-///
-/// ```
-/// let c = '💯';
-/// let i = c as u32;
-///
-/// assert_eq!(128175, i);
-/// ```
-///
-/// However, the reverse is not true: not all valid [`u32`]s are valid
-/// [`char`]s. `from_u32()` will return `None` if the input is not a valid value
-/// for a [`char`].
-///
-/// For an unsafe version of this function which ignores these checks, see
-/// [`from_u32_unchecked`].
-///
-/// # Examples
-///
-/// Basic usage:
-///
-/// ```
-/// use std::char;
-///
-/// let c = char::from_u32(0x2764);
-///
-/// assert_eq!(Some('❤'), c);
-/// ```
-///
-/// Returning `None` when the input is not a valid [`char`]:
-///
-/// ```
-/// use std::char;
-///
-/// let c = char::from_u32(0x110000);
-///
-/// assert_eq!(None, c);
-/// ```
-#[doc(alias = "chr")]
+/// Converts a `u32` to a `char`. See [`char::from_u32`].
 #[must_use]
 #[inline]
-#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_char_convert", issue = "89259")]
-pub const fn from_u32(i: u32) -> Option<char> {
+pub(super) const fn from_u32(i: u32) -> Option<char> {
     // FIXME: once Result::ok is const fn, use it here
     match char_try_from_u32(i) {
         Ok(c) => Some(c),
         Err(_) => None,
     }
 }
 
-/// Converts a `u32` to a `char`, ignoring validity.
-///
-/// Note that all [`char`]s are valid [`u32`]s, and can be cast to one with
-/// `as`:
-///
-/// ```
-/// let c = '💯';
-/// let i = c as u32;
-///
-/// assert_eq!(128175, i);
-/// ```
-///
-/// However, the reverse is not true: not all valid [`u32`]s are valid
-/// [`char`]s. `from_u32_unchecked()` will ignore this, and blindly cast to
-/// [`char`], possibly creating an invalid one.
-///
-/// # Safety
-///
-/// This function is unsafe, as it may construct invalid `char` values.
-///
-/// For a safe version of this function, see the [`from_u32`] function.
-///
-/// # Examples
-///
-/// Basic usage:
-///
-/// ```
-/// use std::char;
-///
-/// let c = unsafe { char::from_u32_unchecked(0x2764) };
-///
-/// assert_eq!('❤', c);
-/// ```
+/// Converts a `u32` to a `char`, ignoring validity. See [`char::from_u32_unchecked`].
+#[rustc_const_unstable(feature = "const_char_convert", issue = "89259")]
 #[inline]
 #[must_use]
-#[stable(feature = "char_from_unchecked", since = "1.5.0")]
-#[rustc_const_unstable(feature = "const_char_convert", issue = "89259")]
-pub const unsafe fn from_u32_unchecked(i: u32) -> char {
+pub(super) const unsafe fn from_u32_unchecked(i: u32) -> char {
     // SAFETY: the caller must guarantee that `i` is a valid char value.
     if cfg!(debug_assertions) { char::from_u32(i).unwrap() } else { unsafe { transmute(i) } }
 }
@@ -317,60 +242,10 @@ impl fmt::Display for CharTryFromError {
     }
 }
 
-/// Converts a digit in the given radix to a `char`.
-///
-/// A 'radix' here is sometimes also called a 'base'. A radix of two
-/// indicates a binary number, a radix of ten, decimal, and a radix of
-/// sixteen, hexadecimal, to give some common values. Arbitrary
-/// radices are supported.
-///
-/// `from_digit()` will return `None` if the input is not a digit in
-/// the given radix.
-///
-/// # Panics
-///
-/// Panics if given a radix larger than 36.
-///
-/// # Examples
-///
-/// Basic usage:
-///
-/// ```
-/// use std::char;
-///
-/// let c = char::from_digit(4, 10);
-///
-/// assert_eq!(Some('4'), c);
-///
-/// // Decimal 11 is a single digit in base 16
-/// let c = char::from_digit(11, 16);
-///
-/// assert_eq!(Some('b'), c);
-/// ```
-///
-/// Returning `None` when the input is not a digit:
-///
-/// ```
-/// use std::char;
-///
-/// let c = char::from_digit(20, 10);
-///
-/// assert_eq!(None, c);
-/// ```
-///
-/// Passing a large radix, causing a panic:
-///
-/// ```should_panic
-/// use std::char;
-///
-/// // this panics
-/// let c = char::from_digit(1, 37);
-/// ```
+/// Converts a digit in the given radix to a `char`. See [`char::from_digit`].
 #[inline]
 #[must_use]
-#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_char_convert", issue = "89259")]
-pub const fn from_digit(num: u32, radix: u32) -> Option<char> {
+pub(super) const fn from_digit(num: u32, radix: u32) -> Option<char> {
     if radix > 36 {
         panic!("from_digit: radix is too high (maximum 36)");
     }

library/core/src/char/decode.rs

@@ -30,54 +30,9 @@ pub struct DecodeUtf16Error {
 }
 
 /// Creates an iterator over the UTF-16 encoded code points in `iter`,
-/// returning unpaired surrogates as `Err`s.
-///
-/// # Examples
-///
-/// Basic usage:
-///
-/// ```
-/// use std::char::decode_utf16;
-///
-/// // 𝄞mus<invalid>ic<invalid>
-/// let v = [
-///     0xD834, 0xDD1E, 0x006d, 0x0075, 0x0073, 0xDD1E, 0x0069, 0x0063, 0xD834,
-/// ];
-///
-/// assert_eq!(
-///     decode_utf16(v.iter().cloned())
-///         .map(|r| r.map_err(|e| e.unpaired_surrogate()))
-///         .collect::<Vec<_>>(),
-///     vec![
-///         Ok('𝄞'),
-///         Ok('m'), Ok('u'), Ok('s'),
-///         Err(0xDD1E),
-///         Ok('i'), Ok('c'),
-///         Err(0xD834)
-///     ]
-/// );
-/// ```
-///
-/// A lossy decoder can be obtained by replacing `Err` results with the replacement character:
-///
-/// ```
-/// use std::char::{decode_utf16, REPLACEMENT_CHARACTER};
-///
-/// // 𝄞mus<invalid>ic<invalid>
-/// let v = [
-///     0xD834, 0xDD1E, 0x006d, 0x0075, 0x0073, 0xDD1E, 0x0069, 0x0063, 0xD834,
-/// ];
-///
-/// assert_eq!(
-///     decode_utf16(v.iter().cloned())
-///        .map(|r| r.unwrap_or(REPLACEMENT_CHARACTER))
-///        .collect::<String>(),
-///     "𝄞mus�ic�"
-/// );
-/// ```
-#[stable(feature = "decode_utf16", since = "1.9.0")]
+/// returning unpaired surrogates as `Err`s. See [`char::decode_utf16`].
 #[inline]
-pub fn decode_utf16<I: IntoIterator<Item = u16>>(iter: I) -> DecodeUtf16<I::IntoIter> {
+pub(super) fn decode_utf16<I: IntoIterator<Item = u16>>(iter: I) -> DecodeUtf16<I::IntoIter> {
     DecodeUtf16 { iter: iter.into_iter(), buf: None }
 }