Auto merge of #103452 - notriddle:rollup-peewevm, r=notriddle

Rollup of 11 pull requests

Successful merges:

 - #100462 (Clarify `array::from_fn` documentation)
 - #101644 (Document surprising and dangerous fs::Permissions behaviour on Unix)
 - #103005 (kmc-solid: Handle errors returned by `SOLID_FS_ReadDir`)
 - #103140 (Add diagnostic for calling a function with the same name with unresolved Macro)
 - #103254 (rustdoc: do not filter out cross-crate `Self: Sized` bounds)
 - #103347 (bootstrap: also create rustc-src component in sysroot)
 - #103402 (Fix wrapped valid-range handling in ty_find_init_error)
 - #103414 (Pretty print lifetimes captured by RPIT)
 - #103424 (rustdoc: remove no-op CSS `.code-header { border-bottom: none }`)
 - #103434 (Use functions for jump-to-def-background rustdoc GUI test)
 - #103447 (`MaybeUninit`: use `assume_init_drop()` in the partially initialized array example)

Failed merges:

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

compiler/rustc_lint/src/builtin.rs

@@ -2526,7 +2526,10 @@ impl<'tcx> LateLintPass<'tcx> for InvalidValue {
                         // return `Bound::Excluded`.  (And we have tests checking that we
                         // handle the attribute correctly.)
                         // We don't add a span since users cannot declare such types anyway.
-                        (Bound::Included(lo), _) if lo > 0 => {
+                        (Bound::Included(lo), Bound::Included(hi)) if 0 < lo && lo < hi => {
+                            return Some((format!("`{}` must be non-null", ty), None));
+                        }
+                        (Bound::Included(lo), Bound::Unbounded) if 0 < lo => {
                             return Some((format!("`{}` must be non-null", ty), None));
                         }
                         (Bound::Included(_), _) | (_, Bound::Included(_))

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -16,6 +16,7 @@ use rustc_session::cstore::{ExternCrate, ExternCrateSource};
 use rustc_span::symbol::{kw, Ident, Symbol};
 use rustc_target::abi::Size;
 use rustc_target::spec::abi::Abi;
+use smallvec::SmallVec;
 
 use std::cell::Cell;
 use std::char;
@@ -794,6 +795,7 @@ pub trait PrettyPrinter<'tcx>:
         let mut traits = FxIndexMap::default();
         let mut fn_traits = FxIndexMap::default();
         let mut is_sized = false;
+        let mut lifetimes = SmallVec::<[ty::Region<'tcx>; 1]>::new();
 
         for (predicate, _) in bounds.subst_iter_copied(tcx, substs) {
             let bound_predicate = predicate.kind();
@@ -824,6 +826,9 @@ pub trait PrettyPrinter<'tcx>:
                         &mut fn_traits,
                     );
                 }
+                ty::PredicateKind::TypeOutlives(outlives) => {
+                    lifetimes.push(outlives.1);
+                }
                 _ => {}
             }
         }
@@ -977,6 +982,11 @@ pub trait PrettyPrinter<'tcx>:
             write!(self, "Sized")?;
         }
 
+        for re in lifetimes {
+            write!(self, " + ")?;
+            self = self.print_region(re)?;
+        }
+
         Ok(self)
     }
 

compiler/rustc_resolve/src/macros.rs

@@ -12,7 +12,7 @@ use rustc_attr::StabilityLevel;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::intern::Interned;
 use rustc_data_structures::sync::Lrc;
-use rustc_errors::struct_span_err;
+use rustc_errors::{struct_span_err, Applicability};
 use rustc_expand::base::{Annotatable, DeriveResolutions, Indeterminate, ResolverExpand};
 use rustc_expand::base::{SyntaxExtension, SyntaxExtensionKind};
 use rustc_expand::compile_declarative_macro;
@@ -694,7 +694,19 @@ impl<'a> Resolver<'a> {
                     check_consistency(self, &path, path_span, kind, initial_res, res)
                 }
                 path_res @ PathResult::NonModule(..) | path_res @ PathResult::Failed { .. } => {
+                    let mut suggestion = None;
                     let (span, label) = if let PathResult::Failed { span, label, .. } = path_res {
+                        // try to suggest if it's not a macro, maybe a function
+                        if let PathResult::NonModule(partial_res) = self.maybe_resolve_path(&path, Some(ValueNS), &parent_scope)
+                            && partial_res.unresolved_segments() == 0 {
+                            let sm = self.session.source_map();
+                            let exclamation_span = sm.next_point(span);
+                            suggestion = Some((
+                                vec![(exclamation_span, "".to_string())],
+                                    format!("{} is not a macro, but a {}, try to remove `!`", Segment::names_to_string(&path), partial_res.base_res().descr()),
+                                    Applicability::MaybeIncorrect
+                                ));
+                        }
                         (span, label)
                     } else {
                         (
@@ -708,7 +720,7 @@ impl<'a> Resolver<'a> {
                     };
                     self.report_error(
                         span,
-                        ResolutionError::FailedToResolve { label, suggestion: None },
+                        ResolutionError::FailedToResolve { label, suggestion },
                     );
                 }
                 PathResult::Module(..) | PathResult::Indeterminate => unreachable!(),

library/core/src/array/mod.rs

@@ -32,6 +32,10 @@ pub use iter::IntoIter;
 /// # Example
 ///
 /// ```rust
+/// // type inference is helping us here, the way `from_fn` knows how many
+/// // elements to produce is the length of array down there: only arrays of
+/// // equal lengths can be compared, so the const generic parameter `N` is
+/// // inferred to be 5, thus creating array of 5 elements.
 /// let array = core::array::from_fn(|i| i);
 /// assert_eq!(array, [0, 1, 2, 3, 4]);
 /// ```

library/core/src/mem/maybe_uninit.rs

@@ -146,7 +146,6 @@ use crate::slice;
 ///
 /// ```
 /// use std::mem::MaybeUninit;
-/// use std::ptr;
 ///
 /// // Create an uninitialized array of `MaybeUninit`. The `assume_init` is
 /// // safe because the type we are claiming to have initialized here is a
@@ -162,7 +161,7 @@ use crate::slice;
 ///
 /// // For each item in the array, drop if we allocated it.
 /// for elem in &mut data[0..data_len] {
-///     unsafe { ptr::drop_in_place(elem.as_mut_ptr()); }
+///     unsafe { elem.assume_init_drop(); }
 /// }
 /// ```
 ///

library/std/src/fs.rs

@@ -1365,6 +1365,34 @@ impl FileTimes {
 impl Permissions {
     /// Returns `true` if these permissions describe a readonly (unwritable) file.
     ///
+    /// # Note
+    ///
+    /// This function does not take Access Control Lists (ACLs) or Unix group
+    /// membership into account.
+    ///
+    /// # Windows
+    ///
+    /// On Windows this returns [`FILE_ATTRIBUTE_READONLY`](https://docs.microsoft.com/en-us/windows/win32/fileio/file-attribute-constants).
+    /// If `FILE_ATTRIBUTE_READONLY` is set then writes to the file will fail
+    /// but the user may still have permission to change this flag. If
+    /// `FILE_ATTRIBUTE_READONLY` is *not* set then writes may still fail due
+    /// to lack of write permission.
+    /// The behavior of this attribute for directories depends on the Windows
+    /// version.
+    ///
+    /// # Unix (including macOS)
+    ///
+    /// On Unix-based platforms this checks if *any* of the owner, group or others
+    /// write permission bits are set. It does not check if the current
+    /// user is in the file's assigned group. It also does not check ACLs.
+    /// Therefore even if this returns true you may not be able to write to the
+    /// file, and vice versa. The [`PermissionsExt`] trait gives direct access
+    /// to the permission bits but also does not read ACLs. If you need to
+    /// accurately know whether or not a file is writable use the `access()`
+    /// function from libc.
+    ///
+    /// [`PermissionsExt`]: crate::os::unix::fs::PermissionsExt
+    ///
     /// # Examples
     ///
     /// ```no_run
@@ -1390,8 +1418,40 @@ impl Permissions {
     /// using the resulting `Permission` will update file permissions to allow
     /// writing.
     ///
-    /// This operation does **not** modify the filesystem. To modify the
-    /// filesystem use the [`set_permissions`] function.
+    /// This operation does **not** modify the files attributes. This only
+    /// changes the in-memory value of these attributes for this `Permissions`
+    /// instance. To modify the files attributes use the [`set_permissions`]
+    /// function which commits these attribute changes to the file.
+    ///
+    /// # Note
+    ///
+    /// `set_readonly(false)` makes the file *world-writable* on Unix.
+    /// You can use the [`PermissionsExt`] trait on Unix to avoid this issue.
+    ///
+    /// It also does not take Access Control Lists (ACLs) or Unix group
+    /// membership into account.
+    ///
+    /// # Windows
+    ///
+    /// On Windows this sets or clears [`FILE_ATTRIBUTE_READONLY`](https://docs.microsoft.com/en-us/windows/win32/fileio/file-attribute-constants).
+    /// If `FILE_ATTRIBUTE_READONLY` is set then writes to the file will fail
+    /// but the user may still have permission to change this flag. If
+    /// `FILE_ATTRIBUTE_READONLY` is *not* set then the write may still fail if
+    /// the user does not have permission to write to the file.
+    ///
+    /// In Windows 7 and earlier this attribute prevents deleting empty
+    /// directories. It does not prevent modifying the directory contents.
+    /// On later versions of Windows this attribute is ignored for directories.
+    ///
+    /// # Unix (including macOS)
+    ///
+    /// On Unix-based platforms this sets or clears the write access bit for
+    /// the owner, group *and* others, equivalent to `chmod a+w <file>`
+    /// or `chmod a-w <file>` respectively. The latter will grant write access
+    /// to all users! You can use the [`PermissionsExt`] trait on Unix
+    /// to avoid this issue.
+    ///
+    /// [`PermissionsExt`]: crate::os::unix::fs::PermissionsExt
     ///
     /// # Examples
     ///
@@ -1405,7 +1465,8 @@ impl Permissions {
     ///
     ///     permissions.set_readonly(true);
     ///
-    ///     // filesystem doesn't change
+    ///     // filesystem doesn't change, only the in memory state of the
+    ///     // readonly permission
     ///     assert_eq!(false, metadata.permissions().readonly());
     ///
     ///     // just this particular `permissions`.

library/std/src/sys/solid/fs.rs

@@ -175,15 +175,19 @@ impl Iterator for ReadDir {
     type Item = io::Result<DirEntry>;
 
     fn next(&mut self) -> Option<io::Result<DirEntry>> {
-        unsafe {
-            let mut out_dirent = MaybeUninit::uninit();
-            error::SolidError::err_if_negative(abi::SOLID_FS_ReadDir(
+        let entry = unsafe {
+            let mut out_entry = MaybeUninit::uninit();
+            match error::SolidError::err_if_negative(abi::SOLID_FS_ReadDir(
                 self.inner.dirp,
-                out_dirent.as_mut_ptr(),
-            ))
-            .ok()?;
-            Some(Ok(DirEntry { entry: out_dirent.assume_init(), inner: Arc::clone(&self.inner) }))
-        }
+                out_entry.as_mut_ptr(),
+            )) {
+                Ok(_) => out_entry.assume_init(),
+                Err(e) if e.as_raw() == abi::SOLID_ERR_NOTFOUND => return None,
+                Err(e) => return Some(Err(e.as_io_error())),
+            }
+        };
+
+        (entry.d_name[0] != 0).then(|| Ok(DirEntry { entry, inner: Arc::clone(&self.inner) }))
     }
 }
 

src/bootstrap/compile.rs

@@ -1177,6 +1177,20 @@ impl Step for Sysroot {
                 );
             }
         }
+        // Same for the rustc-src component.
+        let sysroot_lib_rustlib_rustcsrc = sysroot.join("lib/rustlib/rustc-src");
+        t!(fs::create_dir_all(&sysroot_lib_rustlib_rustcsrc));
+        let sysroot_lib_rustlib_rustcsrc_rust = sysroot_lib_rustlib_rustcsrc.join("rust");
+        if let Err(e) =
+            symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_rustcsrc_rust)
+        {
+            eprintln!(
+                "warning: creating symbolic link `{}` to `{}` failed with {}",
+                sysroot_lib_rustlib_rustcsrc_rust.display(),
+                builder.src.display(),
+                e,
+            );
+        }
 
         INTERNER.intern_path(sysroot)
     }

src/librustdoc/clean/mod.rs

@@ -774,31 +774,36 @@ fn clean_ty_generics<'tcx>(
     let mut where_predicates =
         where_predicates.into_iter().flat_map(|p| clean_predicate(*p, cx)).collect::<Vec<_>>();
 
-    // Type parameters have a Sized bound by default unless removed with
-    // ?Sized. Scan through the predicates and mark any type parameter with
-    // a Sized bound, removing the bounds as we find them.
+    // In the surface language, all type parameters except `Self` have an
+    // implicit `Sized` bound unless removed with `?Sized`.
+    // However, in the list of where-predicates below, `Sized` appears like a
+    // normal bound: It's either present (the type is sized) or
+    // absent (the type is unsized) but never *maybe* (i.e. `?Sized`).
     //
-    // Note that associated types also have a sized bound by default, but we
+    // This is unsuitable for rendering.
+    // Thus, as a first step remove all `Sized` bounds that should be implicit.
+    //
+    // Note that associated types also have an implicit `Sized` bound but we
     // don't actually know the set of associated types right here so that's
-    // handled in cleaning associated types
+    // handled when cleaning associated types.
     let mut sized_params = FxHashSet::default();
-    where_predicates.retain(|pred| match *pred {
-        WherePredicate::BoundPredicate { ty: Generic(ref g), ref bounds, .. } => {
-            if bounds.iter().any(|b| b.is_sized_bound(cx)) {
-                sized_params.insert(*g);
-                false
-            } else {
-                true
-            }
+    where_predicates.retain(|pred| {
+        if let WherePredicate::BoundPredicate { ty: Generic(g), bounds, .. } = pred
+        && *g != kw::SelfUpper
+        && bounds.iter().any(|b| b.is_sized_bound(cx))
+        {
+            sized_params.insert(*g);
+            false
+        } else {
+            true
         }
-        _ => true,
     });
 
-    // Run through the type parameters again and insert a ?Sized
-    // unbound for any we didn't find to be Sized.
+    // As a final step, go through the type parameters again and insert a
+    // `?Sized` bound for each one we didn't find to be `Sized`.
     for tp in &stripped_params {
-        if matches!(tp.kind, types::GenericParamDefKind::Type { .. })
-            && !sized_params.contains(&tp.name)
+        if let types::GenericParamDefKind::Type { .. } = tp.kind
+        && !sized_params.contains(&tp.name)
         {
             where_predicates.push(WherePredicate::BoundPredicate {
                 ty: Type::Generic(tp.name),

src/librustdoc/html/static/css/rustdoc.css

@@ -184,7 +184,6 @@ h4.code-header {
 }
 .code-header {
 	font-weight: 600;
-	border-bottom-style: none;
 	margin: 0;
 	padding: 0;
 }

src/test/rustdoc-gui/jump-to-def-background.goml

@@ -1,43 +1,22 @@
 // We check the background color on the jump to definition links in the source code page.
 goto: "file://" + |DOC_PATH| + "/src/link_to_definition/lib.rs.html"
 
-// Set the theme to dark.
-local-storage: {
-    "rustdoc-theme": "dark",
-    "rustdoc-preferred-dark-theme": "dark",
-    "rustdoc-use-system-theme": "false",
-}
-// We reload the page so the local storage settings are being used.
-reload:
-
-assert-css: (
-    "body.source .example-wrap pre.rust a",
-    {"background-color": "rgb(51, 51, 51)"},
-    ALL,
-)
-
-// Set the theme to ayu.
-local-storage: {
-    "rustdoc-theme": "ayu",
-    "rustdoc-preferred-dark-theme": "ayu",
-    "rustdoc-use-system-theme": "false",
-}
-// We reload the page so the local storage settings are being used.
-reload:
-
-assert-css: (
-    "body.source .example-wrap pre.rust a",
-    {"background-color": "rgb(51, 51, 51)"},
-    ALL,
+define-function: (
+    "check-background-color",
+    (theme, background_color),
+    [
+        // Set the theme.
+        ("local-storage", { "rustdoc-theme": |theme|, "rustdoc-use-system-theme": "false" }),
+        // We reload the page so the local storage settings are being used.
+        ("reload"),
+        ("assert-css", (
+            "body.source .example-wrap pre.rust a",
+            {"background-color": |background_color|},
+            ALL,
+        )),
+    ],
 )
 
-// Set the theme to light.
-local-storage: {"rustdoc-theme": "light", "rustdoc-use-system-theme": "false"}
-// We reload the page so the local storage settings are being used.
-reload:
-
-assert-css: (
-    "body.source .example-wrap pre.rust a",
-    {"background-color": "rgb(238, 238, 238)"},
-    ALL,
-)
+call-function: ("check-background-color", ("ayu", "rgb(51, 51, 51)"))
+call-function: ("check-background-color", ("dark", "rgb(51, 51, 51)"))
+call-function: ("check-background-color", ("light", "rgb(238, 238, 238)"))

src/test/rustdoc/inline_cross/auxiliary/issue-24183.rs

@@ -0,0 +1,14 @@
+#![crate_type = "lib"]
+
+pub trait U/*: ?Sized */ {
+    fn modified(self) -> Self
+    where
+        Self: Sized
+    {
+        self
+    }
+
+    fn touch(&self)/* where Self: ?Sized */{}
+}
+
+pub trait S: Sized {}

src/test/rustdoc/inline_cross/issue-24183.method_no_where_self_sized.html

@@ -0,0 +1 @@
+<h4 class="code-header">fn <a href="#method.touch" class="fnname">touch</a>(&amp;self)</h4>