Auto merge of #106780 - flip1995:clippyup, r=Manishearth

Update Clippy

r? `@Manishearth`

Author: bors

src/tools/clippy/.github/driver.sh

@@ -17,6 +17,13 @@ test "$sysroot" = $desired_sysroot
 sysroot=$(SYSROOT=$desired_sysroot ./target/debug/clippy-driver --print sysroot)
 test "$sysroot" = $desired_sysroot
 
+# Check that the --sysroot argument is only passed once (SYSROOT is ignored)
+(
+    cd rustc_tools_util
+    touch src/lib.rs
+    SYSROOT=/tmp RUSTFLAGS="--sysroot=$(rustc --print sysroot)" ../target/debug/cargo-clippy clippy --verbose
+)
+
 # Make sure this isn't set - clippy-driver should cope without it
 unset CARGO_MANIFEST_DIR
 

src/tools/clippy/CHANGELOG.md

@@ -4137,6 +4137,7 @@ Released 2018-09-13
 [`derive_hash_xor_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_hash_xor_eq
 [`derive_ord_xor_partial_ord`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_ord_xor_partial_ord
 [`derive_partial_eq_without_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_partial_eq_without_eq
+[`derived_hash_with_manual_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derived_hash_with_manual_eq
 [`disallowed_macros`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_macros
 [`disallowed_method`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_method
 [`disallowed_methods`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_methods

src/tools/clippy/book/src/installation.md

@@ -1,6 +1,6 @@
 # Installation
 
-If you're using `rustup` to install and manage you're Rust toolchains, Clippy is
+If you're using `rustup` to install and manage your Rust toolchains, Clippy is
 usually **already installed**. In that case you can skip this chapter and go to
 the [Usage] chapter.
 

src/tools/clippy/clippy_dev/src/lib.rs

@@ -5,6 +5,9 @@
 // warn on lints, that are included in `rust-lang/rust`s bootstrap
 #![warn(rust_2018_idioms, unused_lifetimes)]
 
+// The `rustc_driver` crate seems to be required in order to use the `rust_lexer` crate.
+#[allow(unused_extern_crates)]
+extern crate rustc_driver;
 extern crate rustc_lexer;
 
 use std::path::PathBuf;

src/tools/clippy/clippy_lints/src/box_default.rs

@@ -8,7 +8,7 @@ use rustc_hir::{
     Block, Expr, ExprKind, Local, Node, QPath, TyKind,
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
-use rustc_middle::lint::in_external_macro;
+use rustc_middle::{lint::in_external_macro, ty::print::with_forced_trimmed_paths};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::sym;
 
@@ -59,7 +59,7 @@ impl LateLintPass<'_> for BoxDefault {
                 if is_plain_default(arg_path) || given_type(cx, expr) {
                     "Box::default()".into()
                 } else {
-                    format!("Box::<{arg_ty}>::default()")
+                    with_forced_trimmed_paths!(format!("Box::<{arg_ty}>::default()"))
                 },
                 Applicability::MachineApplicable
             );

src/tools/clippy/clippy_lints/src/copies.rs

@@ -525,7 +525,11 @@ fn check_for_warn_of_moved_symbol(cx: &LateContext<'_>, symbols: &[(HirId, Symbo
             .iter()
             .filter(|&&(_, name)| !name.as_str().starts_with('_'))
             .any(|&(_, name)| {
-                let mut walker = ContainsName { name, result: false };
+                let mut walker = ContainsName {
+                    name,
+                    result: false,
+                    cx,
+                };
 
                 // Scan block
                 block

src/tools/clippy/clippy_lints/src/dbg_macro.rs

@@ -10,11 +10,11 @@ use rustc_span::sym;
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for usage of dbg!() macro.
+    /// Checks for usage of the [`dbg!`](https://doc.rust-lang.org/std/macro.dbg.html) macro.
     ///
     /// ### Why is this bad?
-    /// `dbg!` macro is intended as a debugging tool. It
-    /// should not be in version control.
+    /// The `dbg!` macro is intended as a debugging tool. It should not be present in released
+    /// software or committed to a version control system.
     ///
     /// ### Example
     /// ```rust,ignore
@@ -91,8 +91,8 @@ impl LateLintPass<'_> for DbgMacro {
                 cx,
                 DBG_MACRO,
                 macro_call.span,
-                "`dbg!` macro is intended as a debugging tool",
-                "ensure to avoid having uses of it in version control",
+                "the `dbg!` macro is intended as a debugging tool",
+                "remove the invocation before committing it to a version control system",
                 suggestion,
                 applicability,
             );

src/tools/clippy/clippy_lints/src/declared_lints.rs

@@ -111,7 +111,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::dereference::NEEDLESS_BORROW_INFO,
     crate::dereference::REF_BINDING_TO_REFERENCE_INFO,
     crate::derivable_impls::DERIVABLE_IMPLS_INFO,
-    crate::derive::DERIVE_HASH_XOR_EQ_INFO,
+    crate::derive::DERIVED_HASH_WITH_MANUAL_EQ_INFO,
     crate::derive::DERIVE_ORD_XOR_PARTIAL_ORD_INFO,
     crate::derive::DERIVE_PARTIAL_EQ_WITHOUT_EQ_INFO,
     crate::derive::EXPL_IMPL_CLONE_ON_COPY_INFO,

src/tools/clippy/clippy_lints/src/default.rs

@@ -11,6 +11,7 @@ use rustc_hir::def::Res;
 use rustc_hir::{Block, Expr, ExprKind, PatKind, QPath, Stmt, StmtKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
+use rustc_middle::ty::print::with_forced_trimmed_paths;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::symbol::{Ident, Symbol};
 use rustc_span::Span;
@@ -98,9 +99,7 @@ impl<'tcx> LateLintPass<'tcx> for Default {
             if let ty::Adt(def, ..) = expr_ty.kind();
             if !is_from_proc_macro(cx, expr);
             then {
-                // TODO: Work out a way to put "whatever the imported way of referencing
-                // this type in this file" rather than a fully-qualified type.
-                let replacement = format!("{}::default()", cx.tcx.def_path_str(def.did()));
+                let replacement = with_forced_trimmed_paths!(format!("{}::default()", cx.tcx.def_path_str(def.did())));
                 span_lint_and_sugg(
                     cx,
                     DEFAULT_TRAIT_ACCESS,
@@ -170,7 +169,7 @@ impl<'tcx> LateLintPass<'tcx> for Default {
                 // find out if and which field was set by this `consecutive_statement`
                 if let Some((field_ident, assign_rhs)) = field_reassigned_by_stmt(consecutive_statement, binding_name) {
                     // interrupt and cancel lint if assign_rhs references the original binding
-                    if contains_name(binding_name, assign_rhs) {
+                    if contains_name(binding_name, assign_rhs, cx) {
                         cancel_lint = true;
                         break;
                     }

src/tools/clippy/clippy_lints/src/dereference.rs

@@ -1282,10 +1282,10 @@ fn referent_used_exactly_once<'tcx>(
             possible_borrowers.push((body_owner_local_def_id, PossibleBorrowerMap::new(cx, mir)));
         }
         let possible_borrower = &mut possible_borrowers.last_mut().unwrap().1;
-        // If `place.local` were not included here, the `copyable_iterator::warn` test would fail. The
-        // reason is that `PossibleBorrowerVisitor::visit_terminator` considers `place.local` a possible
-        // borrower of itself. See the comment in that method for an explanation as to why.
-        possible_borrower.at_most_borrowers(cx, &[local, place.local], place.local, location)
+        // If `only_borrowers` were used here, the `copyable_iterator::warn` test would fail. The reason is
+        // that `PossibleBorrowerVisitor::visit_terminator` considers `place.local` a possible borrower of
+        // itself. See the comment in that method for an explanation as to why.
+        possible_borrower.bounded_borrowers(&[local], &[local, place.local], place.local, location)
             && used_exactly_once(mir, place.local).unwrap_or(false)
     } else {
         false