Merge remote-tracking branch 'upstream/master' into rustup

Author: flip1995

.gitignore

@@ -29,6 +29,7 @@ out
 
 # gh pages docs
 util/gh-pages/lints.json
+**/metadata_collection.json
 
 # rustfmt backups
 *.rs.bk

CONTRIBUTING.md

@@ -118,7 +118,7 @@ which `IntelliJ Rust` will be able to understand.
 Run `cargo dev ide_setup --repo-path <repo-path>` where `<repo-path>` is a path to the rustc repo
 you just cloned.
 The command will add path-dependencies pointing towards rustc-crates inside the rustc repo to
-Clippys `Cargo.toml`s and should allow rust-analyzer to understand most of the types that Clippy uses.
+Clippys `Cargo.toml`s and should allow `IntelliJ Rust` to understand most of the types that Clippy uses.
 Just make sure to remove the dependencies again before finally making a pull request!
 
 [rustc_repo]: https://github.com/rust-lang/rust/

Cargo.toml

@@ -52,6 +52,7 @@ rustc_tools_util = { version = "0.2.0", path = "rustc_tools_util" }
 deny-warnings = []
 integration = ["tempfile"]
 internal-lints = ["clippy_lints/internal-lints"]
+metadata-collector-lint = ["internal-lints", "clippy_lints/metadata-collector-lint"]
 
 [package.metadata.rust-analyzer]
 # This package uses #[feature(rustc_private)]

clippy_lints/Cargo.toml

@@ -20,6 +20,7 @@ pulldown-cmark = { version = "0.8", default-features = false }
 quine-mc_cluskey = "0.2.2"
 regex-syntax = "0.6"
 serde = { version = "1.0", features = ["derive"] }
+serde_json = { version = "1.0", optional = true }
 toml = "0.5.3"
 unicode-normalization = "0.1"
 semver = "0.11"
@@ -32,6 +33,7 @@ url = { version = "2.1.0", features = ["serde"] }
 deny-warnings = []
 # build clippy with internal lints enabled, off by default
 internal-lints = ["clippy_utils/internal-lints"]
+metadata-collector-lint = ["serde_json", "clippy_utils/metadata-collector-lint"]
 
 [package.metadata.rust-analyzer]
 # This crate uses #[feature(rustc_private)]

clippy_lints/src/comparison_chain.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_help;
 use clippy_utils::ty::implements_trait;
-use clippy_utils::{get_trait_def_id, if_sequence, is_else_clause, paths, SpanlessEq};
+use clippy_utils::{get_trait_def_id, if_sequence, in_constant, is_else_clause, paths, SpanlessEq};
 use rustc_hir::{BinOpKind, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
@@ -64,6 +64,10 @@ impl<'tcx> LateLintPass<'tcx> for ComparisonChain {
             return;
         }
 
+        if in_constant(cx, expr.hir_id) {
+            return;
+        }
+
         // Check that there exists at least one explicit else condition
         let (conds, _) = if_sequence(expr);
         if conds.len() < 2 {

clippy_lints/src/default.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::{span_lint_and_note, span_lint_and_sugg};
 use clippy_utils::source::snippet_with_macro_callsite;
-use clippy_utils::{any_parent_is_automatically_derived, contains_name, match_def_path, paths};
+use clippy_utils::{any_parent_is_automatically_derived, contains_name, in_macro, match_def_path, paths};
 use if_chain::if_chain;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
@@ -75,6 +75,7 @@ impl_lint_pass!(Default => [DEFAULT_TRAIT_ACCESS, FIELD_REASSIGN_WITH_DEFAULT]);
 impl LateLintPass<'_> for Default {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if_chain! {
+            if !in_macro(expr.span);
             // Avoid cases already linted by `field_reassign_with_default`
             if !self.reassigned_linted.contains(&expr.span);
             if let ExprKind::Call(path, ..) = expr.kind;

clippy_lints/src/eval_order_dependence.rs

@@ -1,5 +1,6 @@
 use clippy_utils::diagnostics::{span_lint, span_lint_and_note};
 use clippy_utils::{get_parent_expr, path_to_local, path_to_local_id};
+use if_chain::if_chain;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_hir::{BinOpKind, Block, Expr, ExprKind, Guard, HirId, Local, Node, Stmt, StmtKind};
 use rustc_lint::{LateContext, LateLintPass};
@@ -70,20 +71,19 @@ declare_lint_pass!(EvalOrderDependence => [EVAL_ORDER_DEPENDENCE, DIVERGING_SUB_
 impl<'tcx> LateLintPass<'tcx> for EvalOrderDependence {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         // Find a write to a local variable.
-        match expr.kind {
-            ExprKind::Assign(lhs, ..) | ExprKind::AssignOp(_, lhs, _) => {
-                if let Some(var) = path_to_local(lhs) {
-                    let mut visitor = ReadVisitor {
-                        cx,
-                        var,
-                        write_expr: expr,
-                        last_expr: expr,
-                    };
-                    check_for_unsequenced_reads(&mut visitor);
-                }
-            },
-            _ => {},
-        }
+        let var = if_chain! {
+            if let ExprKind::Assign(lhs, ..) | ExprKind::AssignOp(_, lhs, _) = expr.kind;
+            if let Some(var) = path_to_local(lhs);
+            if expr.span.desugaring_kind().is_none();
+            then { var } else { return; }
+        };
+        let mut visitor = ReadVisitor {
+            cx,
+            var,
+            write_expr: expr,
+            last_expr: expr,
+        };
+        check_for_unsequenced_reads(&mut visitor);
     }
     fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
         match stmt.kind {
@@ -305,7 +305,7 @@ impl<'a, 'tcx> Visitor<'tcx> for ReadVisitor<'a, 'tcx> {
                     self.cx,
                     EVAL_ORDER_DEPENDENCE,
                     expr.span,
-                    "unsequenced read of a variable",
+                    &format!("unsequenced read of `{}`", self.cx.tcx.hir().name(self.var)),
                     Some(self.write_expr.span),
                     "whether read occurs before this write depends on evaluation order",
                 );