Auto merge of #9174 - flip1995:rustup, r=<try>

Rustup

r? `@ghost`

changelog: none

Author: bors

book/src/README.md

@@ -1,7 +1,7 @@
 # Clippy
 
 [![Clippy Test](https://github.com/rust-lang/rust-clippy/workflows/Clippy%20Test/badge.svg?branch=auto&event=push)](https://github.com/rust-lang/rust-clippy/actions?query=workflow%3A%22Clippy+Test%22+event%3Apush+branch%3Aauto)
-[![License: MIT OR Apache-2.0](https://img.shields.io/crates/l/clippy.svg)](#license)
+[![License: MIT OR Apache-2.0](https://img.shields.io/crates/l/clippy.svg)](https://github.com/rust-lang/rust-clippy#license)
 
 A collection of lints to catch common mistakes and improve your
 [Rust](https://github.com/rust-lang/rust) code.

book/src/development/adding_lints.md

@@ -13,7 +13,6 @@ because that's clearly a non-descriptive name.
   - [Testing](#testing)
     - [Cargo lints](#cargo-lints)
   - [Rustfix tests](#rustfix-tests)
-  - [Edition 2018 tests](#edition-2018-tests)
   - [Testing manually](#testing-manually)
   - [Lint declaration](#lint-declaration)
   - [Lint registration](#lint-registration)
@@ -402,9 +401,8 @@ need to ensure that the MSRV configured for the project is >= the MSRV of the
 required Rust feature. If multiple features are required, just use the one with
 a lower MSRV.
 
-First, add an MSRV alias for the required feature in
-[`clippy_utils::msrvs`](/clippy_utils/src/msrvs.rs). This can be accessed later
-as `msrvs::STR_STRIP_PREFIX`, for example.
+First, add an MSRV alias for the required feature in [`clippy_utils::msrvs`].
+This can be accessed later as `msrvs::STR_STRIP_PREFIX`, for example.
 
 ```rust
 msrv_aliases! {
@@ -468,6 +466,8 @@ define_Conf! {
 }
 ```
 
+[`clippy_utils::msrvs`]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/msrvs/index.html
+
 ## Author lint
 
 If you have trouble implementing your lint, there is also the internal `author`
@@ -583,8 +583,7 @@ the workspace directory. Adding a configuration to a lint can be useful for
 thresholds or to constrain some behavior that can be seen as a false positive
 for some users. Adding a configuration is done in the following steps:
 
-1. Adding a new configuration entry to
-   [clippy_lints::utils::conf](/clippy_lints/src/utils/conf.rs) like this:
+1. Adding a new configuration entry to [`clippy_lints::utils::conf`] like this:
 
    ```rust
    /// Lint: LINT_NAME.
@@ -635,9 +634,9 @@ for some users. Adding a configuration is done in the following steps:
        ```
 3. Passing the configuration value to the lint impl struct:
 
-   First find the struct construction in the [clippy_lints lib
-   file](/clippy_lints/src/lib.rs). The configuration value is now cloned or
-   copied into a local value that is then passed to the impl struct like this:
+   First find the struct construction in the [`clippy_lints` lib file]. The
+   configuration value is now cloned or copied into a local value that is then
+   passed to the impl struct like this:
 
    ```rust
    // Default generated registration:
@@ -653,12 +652,16 @@ for some users. Adding a configuration is done in the following steps:
 
 4. Adding tests:
     1. The default configured value can be tested like any normal lint in
-       [`tests/ui`](/tests/ui).
-    2. The configuration itself will be tested separately in
-       [`tests/ui-toml`](/tests/ui-toml). Simply add a new subfolder with a
-       fitting name. This folder contains a `clippy.toml` file with the
-       configuration value and a rust file that should be linted by Clippy. The
-       test can otherwise be written as usual.
+       [`tests/ui`].
+    2. The configuration itself will be tested separately in [`tests/ui-toml`].
+       Simply add a new subfolder with a fitting name. This folder contains a
+       `clippy.toml` file with the configuration value and a rust file that
+       should be linted by Clippy. The test can otherwise be written as usual.
+
+[`clippy_lints::utils::conf`]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/utils/conf.rs
+[`clippy_lints` lib file]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/lib.rs
+[`tests/ui`]: https://github.com/rust-lang/rust-clippy/blob/master/tests/ui
+[`tests/ui-toml`]: https://github.com/rust-lang/rust-clippy/blob/master/tests/ui-toml
 
 ## Cheat Sheet
 

book/src/development/basics.md

@@ -102,7 +102,7 @@ cargo dev dogfood
 ```
 
 More about intellij command usage and reasons
-[here](../CONTRIBUTING.md#intellij-rust)
+[here](https://github.com/rust-lang/rust-clippy/blob/master/CONTRIBUTING.md#intellij-rust)
 
 ## lintcheck
 

book/src/development/common_tools_writing_lints.md

@@ -276,4 +276,4 @@ functions to deal with macros:
 [LateContext]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LateContext.html
 [TyCtxt]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TyCtxt.html
 [pat_ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TypeckResults.html#method.pat_ty
-[paths]: ../clippy_utils/src/paths.rs
+[paths]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/paths/index.html

book/src/usage.md

@@ -148,4 +148,4 @@ clippy-driver --edition 2018 -Cpanic=abort foo.rs
 > that are not optimized as expected, for example.
 
 [Installation]: installation.md
-[CI]: continuous_integration
+[CI]: continuous_integration/index.md

clippy_lints/src/blocks_in_if_conditions.rs

@@ -6,7 +6,7 @@ use clippy_utils::ty::implements_trait;
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_expr, Visitor};
-use rustc_hir::{BlockCheckMode, Expr, ExprKind};
+use rustc_hir::{BlockCheckMode, Closure, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
@@ -51,7 +51,7 @@ struct ExVisitor<'a, 'tcx> {
 
 impl<'a, 'tcx> Visitor<'tcx> for ExVisitor<'a, 'tcx> {
     fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
-        if let ExprKind::Closure { body, .. } = expr.kind {
+        if let ExprKind::Closure(&Closure { body, .. }) = expr.kind {
             // do not lint if the closure is called using an iterator (see #1141)
             if_chain! {
                 if let Some(parent) = get_parent_expr(self.cx, expr);

clippy_lints/src/bytecount.rs

@@ -5,7 +5,7 @@ use clippy_utils::visitors::is_local_used;
 use clippy_utils::{path_to_local_id, paths, peel_blocks, peel_ref_operators, strip_pat_refs};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
-use rustc_hir::{BinOpKind, Expr, ExprKind, PatKind};
+use rustc_hir::{BinOpKind, Closure, Expr, ExprKind, PatKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::{self, UintTy};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
@@ -51,7 +51,7 @@ impl<'tcx> LateLintPass<'tcx> for ByteCount {
             if count.ident.name == sym::count;
             if let ExprKind::MethodCall(filter, [filter_recv, filter_arg], _) = count_recv.kind;
             if filter.ident.name == sym!(filter);
-            if let ExprKind::Closure { body, .. } = filter_arg.kind;
+            if let ExprKind::Closure(&Closure { body, .. }) = filter_arg.kind;
             let body = cx.tcx.hir().body(body);
             if let [param] = body.params;
             if let PatKind::Binding(_, arg_id, _, _) = strip_pat_refs(param.pat).kind;

clippy_lints/src/dereference.rs

@@ -8,14 +8,14 @@ use rustc_data_structures::fx::FxIndexMap;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_ty, Visitor};
 use rustc_hir::{
-    self as hir, BindingAnnotation, Body, BodyId, BorrowKind, Expr, ExprKind, FnRetTy, GenericArg, HirId, ImplItem,
-    ImplItemKind, Item, ItemKind, Local, MatchSource, Mutability, Node, Pat, PatKind, Path, QPath, TraitItem,
+    self as hir, BindingAnnotation, Body, BodyId, BorrowKind, Closure, Expr, ExprKind, FnRetTy, GenericArg, HirId,
+    ImplItem, ImplItemKind, Item, ItemKind, Local, MatchSource, Mutability, Node, Pat, PatKind, Path, QPath, TraitItem,
     TraitItemKind, TyKind, UnOp,
 };
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
-use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable, TypeckResults};
+use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitable, TypeckResults};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::{symbol::sym, Span, Symbol};
 use rustc_trait_selection::infer::InferCtxtExt;
@@ -720,7 +720,7 @@ fn walk_parents<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> (Position, &
                     let owner_id = cx.tcx.hir().body_owner(cx.enclosing_body.unwrap());
                     Some(
                         if let Node::Expr(Expr {
-                            kind: ExprKind::Closure { fn_decl, .. },
+                            kind: ExprKind::Closure(&Closure { fn_decl, .. }),
                             ..
                         }) = cx.tcx.hir().get(owner_id)
                         {

clippy_lints/src/duplicate_mod.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_help;
 use rustc_ast::ast::{Crate, Inline, Item, ItemKind, ModKind};
 use rustc_errors::MultiSpan;
-use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_lint::{EarlyContext, EarlyLintPass, Level, LintContext};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::{FileName, Span};
 use std::collections::BTreeMap;
@@ -49,6 +49,7 @@ declare_clippy_lint! {
 struct Modules {
     local_path: PathBuf,
     spans: Vec<Span>,
+    lint_levels: Vec<Level>,
 }
 
 #[derive(Default)]
@@ -70,13 +71,38 @@ impl EarlyLintPass for DuplicateMod {
             let modules = self.modules.entry(absolute_path).or_insert(Modules {
                 local_path,
                 spans: Vec::new(),
+                lint_levels: Vec::new(),
             });
             modules.spans.push(item.span_with_attributes());
+            modules.lint_levels.push(cx.get_lint_level(DUPLICATE_MOD));
         }
     }
 
     fn check_crate_post(&mut self, cx: &EarlyContext<'_>, _: &Crate) {
-        for Modules { local_path, spans } in self.modules.values() {
+        for Modules {
+            local_path,
+            spans,
+            lint_levels,
+        } in self.modules.values()
+        {
+            if spans.len() < 2 {
+                continue;
+            }
+
+            // At this point the lint would be emitted
+            assert_eq!(spans.len(), lint_levels.len());
+            let spans: Vec<_> = spans
+                .iter()
+                .zip(lint_levels)
+                .filter_map(|(span, lvl)| {
+                    if let Some(id) = lvl.get_expectation_id() {
+                        cx.fulfill_expectation(id);
+                    }
+
+                    (!matches!(lvl, Level::Allow | Level::Expect(_))).then_some(*span)
+                })
+                .collect();
+
             if spans.len() < 2 {
                 continue;
             }

clippy_lints/src/escape.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_hir;
 use clippy_utils::ty::contains_ty;
 use rustc_hir::intravisit;
-use rustc_hir::{self, AssocItemKind, Body, FnDecl, HirId, HirIdSet, Impl, ItemKind, Node};
+use rustc_hir::{self, AssocItemKind, Body, FnDecl, HirId, HirIdSet, Impl, ItemKind, Node, Pat, PatKind};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::FakeReadCause;
@@ -132,7 +132,10 @@ impl<'tcx> LateLintPass<'tcx> for BoxedLocal {
 // TODO: Replace with Map::is_argument(..) when it's fixed
 fn is_argument(map: rustc_middle::hir::map::Map<'_>, id: HirId) -> bool {
     match map.find(id) {
-        Some(Node::Binding(_)) => (),
+        Some(Node::Pat(Pat {
+            kind: PatKind::Binding(..),
+            ..
+        })) => (),
         _ => return false,
     }
 
@@ -144,15 +147,6 @@ impl<'a, 'tcx> Delegate<'tcx> for EscapeDelegate<'a, 'tcx> {
         if cmt.place.projections.is_empty() {
             if let PlaceBase::Local(lid) = cmt.place.base {
                 self.set.remove(&lid);
-                let map = &self.cx.tcx.hir();
-                if let Some(Node::Binding(_)) = map.find(cmt.hir_id) {
-                    if self.set.contains(&lid) {
-                        // let y = x where x is known
-                        // remove x, insert y
-                        self.set.insert(cmt.hir_id);
-                        self.set.remove(&lid);
-                    }
-                }
             }
         }
     }

clippy_lints/src/eta_reduction.rs

@@ -7,12 +7,12 @@ use clippy_utils::{higher, is_adjusted, path_to_local, path_to_local_id};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::def_id::DefId;
-use rustc_hir::{Expr, ExprKind, Param, PatKind, Unsafety};
+use rustc_hir::{Closure, Expr, ExprKind, Param, PatKind, Unsafety};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
 use rustc_middle::ty::binding::BindingMode;
 use rustc_middle::ty::subst::Subst;
-use rustc_middle::ty::{self, ClosureKind, Ty, TypeFoldable};
+use rustc_middle::ty::{self, ClosureKind, Ty, TypeVisitable};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::symbol::sym;
 
@@ -78,7 +78,7 @@ impl<'tcx> LateLintPass<'tcx> for EtaReduction {
             return;
         }
         let body = match expr.kind {
-            ExprKind::Closure { body, .. } => cx.tcx.hir().body(body),
+            ExprKind::Closure(&Closure { body, .. }) => cx.tcx.hir().body(body),
             _ => return,
         };
         if body.value.span.from_expansion() {

clippy_lints/src/excessive_bools.rs

@@ -94,7 +94,7 @@ impl ExcessiveBools {
 
     fn check_fn_sig(&self, cx: &EarlyContext<'_>, fn_sig: &FnSig, span: Span) {
         match fn_sig.header.ext {
-            Extern::Implicit | Extern::Explicit(_) => return,
+            Extern::Implicit(_) | Extern::Explicit(_, _) => return,
             Extern::None => (),
         }
 

clippy_lints/src/explicit_write.rs

@@ -125,7 +125,7 @@ fn look_in_block<'tcx, 'hir>(cx: &LateContext<'tcx>, kind: &'tcx ExprKind<'hir>)
         // Find id of the local that expr_end_of_block resolves to
         if let ExprKind::Path(QPath::Resolved(None, expr_path)) = expr_end_of_block.kind;
         if let Res::Local(expr_res) = expr_path.res;
-        if let Some(Node::Binding(res_pat)) = cx.tcx.hir().find(expr_res);
+        if let Some(Node::Pat(res_pat)) = cx.tcx.hir().find(expr_res);
 
         // Find id of the local we found in the block
         if let PatKind::Binding(BindingAnnotation::Unannotated, local_hir_id, _ident, None) = local.pat.kind;

clippy_lints/src/infinite_iter.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint;
 use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
 use clippy_utils::{higher, match_def_path, path_def_id, paths};
-use rustc_hir::{BorrowKind, Expr, ExprKind};
+use rustc_hir::{BorrowKind, Closure, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::symbol::{sym, Symbol};
@@ -159,7 +159,7 @@ fn is_infinite(cx: &LateContext<'_>, expr: &Expr<'_>) -> Finiteness {
                 }
             }
             if method.ident.name == sym!(flat_map) && args.len() == 2 {
-                if let ExprKind::Closure { body, .. } = args[1].kind {
+                if let ExprKind::Closure(&Closure { body, .. }) = args[1].kind {
                     let body = cx.tcx.hir().body(body);
                     return is_infinite(cx, &body.value);
                 }

clippy_lints/src/inherent_to_string.rs

@@ -2,7 +2,7 @@ use clippy_utils::diagnostics::span_lint_and_help;
 use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
 use clippy_utils::{get_trait_def_id, paths, return_ty, trait_ref_of_method};
 use if_chain::if_chain;
-use rustc_hir::{ImplItem, ImplItemKind};
+use rustc_hir::{GenericParamKind, ImplItem, ImplItemKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::sym;
@@ -102,7 +102,7 @@ impl<'tcx> LateLintPass<'tcx> for InherentToString {
             let decl = &signature.decl;
             if decl.implicit_self.has_implicit_self();
             if decl.inputs.len() == 1;
-            if impl_item.generics.params.is_empty();
+            if impl_item.generics.params.iter().all(|p| matches!(p.kind, GenericParamKind::Lifetime { .. }));
 
             // Check if return type is String
             if is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id()), sym::String);

clippy_lints/src/lifetimes.rs

@@ -9,8 +9,8 @@ use rustc_hir::intravisit::{
 use rustc_hir::FnRetTy::Return;
 use rustc_hir::{
     BareFnTy, BodyId, FnDecl, GenericArg, GenericBound, GenericParam, GenericParamKind, Generics, Impl, ImplItem,
-    ImplItemKind, Item, ItemKind, LangItem, Lifetime, LifetimeName, ParamName, PolyTraitRef, PredicateOrigin,
-    TraitBoundModifier, TraitFn, TraitItem, TraitItemKind, Ty, TyKind, WherePredicate,
+    ImplItemKind, Item, ItemKind, LangItem, Lifetime, LifetimeName, LifetimeParamKind, ParamName, PolyTraitRef,
+    PredicateOrigin, TraitBoundModifier, TraitFn, TraitItem, TraitItemKind, Ty, TyKind, WherePredicate,
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::hir::nested_filter as middle_nested_filter;
@@ -338,7 +338,10 @@ fn could_use_elision<'tcx>(
 fn allowed_lts_from(named_generics: &[GenericParam<'_>]) -> FxHashSet<RefLt> {
     let mut allowed_lts = FxHashSet::default();
     for par in named_generics.iter() {
-        if let GenericParamKind::Lifetime { .. } = par.kind {
+        if let GenericParamKind::Lifetime {
+            kind: LifetimeParamKind::Explicit,
+        } = par.kind
+        {
             allowed_lts.insert(RefLt::Named(par.name.ident().name));
         }
     }
@@ -379,6 +382,7 @@ impl<'a, 'tcx> RefVisitor<'a, 'tcx> {
                 self.lts.push(RefLt::Static);
             } else if let LifetimeName::Param(_, ParamName::Fresh) = lt.name {
                 // Fresh lifetimes generated should be ignored.
+                self.lts.push(RefLt::Unnamed);
             } else if lt.is_elided() {
                 self.lts.push(RefLt::Unnamed);
             } else {

clippy_lints/src/loops/mut_range_bound.rs

@@ -43,7 +43,7 @@ fn mut_warn_with_span(cx: &LateContext<'_>, span: Option<Span>) {
 fn check_for_mutability(cx: &LateContext<'_>, bound: &Expr<'_>) -> Option<HirId> {
     if_chain! {
         if let Some(hir_id) = path_to_local(bound);
-        if let Node::Binding(pat) = cx.tcx.hir().get(hir_id);
+        if let Node::Pat(pat) = cx.tcx.hir().get(hir_id);
         if let PatKind::Binding(BindingAnnotation::Mutable, ..) = pat.kind;
         then {
             return Some(hir_id);

clippy_lints/src/loops/needless_range_loop.rs

@@ -9,7 +9,7 @@ use rustc_ast::ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::intravisit::{walk_expr, Visitor};
-use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind, HirId, Mutability, Pat, PatKind, QPath};
+use rustc_hir::{BinOpKind, BorrowKind, Closure, Expr, ExprKind, HirId, Mutability, Pat, PatKind, QPath};
 use rustc_lint::LateContext;
 use rustc_middle::middle::region;
 use rustc_middle::ty::{self, Ty};
@@ -369,7 +369,7 @@ impl<'a, 'tcx> Visitor<'tcx> for VarVisitor<'a, 'tcx> {
                     self.visit_expr(expr);
                 }
             },
-            ExprKind::Closure { body, .. } => {
+            ExprKind::Closure(&Closure { body, .. }) => {
                 let body = self.cx.tcx.hir().body(body);
                 self.visit_expr(&body.value);
             },