Auto merge of #83480 - flip1995:clippyup, r=Dylan-DPC

Update Clippy

Bi-weekly Clippy update.

r? `@Manishearth`

Cargo.lock

@@ -557,18 +557,20 @@ dependencies = [
 
 [[package]]
 name = "clippy"
-version = "0.1.52"
+version = "0.1.53"
 dependencies = [
  "cargo_metadata 0.12.0",
  "clippy-mini-macro-test",
  "clippy_lints",
  "compiletest_rs 0.6.0",
  "derive-new",
+ "quote",
  "regex",
  "rustc-workspace-hack",
  "rustc_tools_util 0.2.0",
  "semver 0.11.0",
  "serde",
+ "syn",
  "tempfile",
  "tester 0.9.0",
 ]
@@ -579,37 +581,32 @@ version = "0.2.0"
 
 [[package]]
 name = "clippy_lints"
-version = "0.1.52"
+version = "0.1.53"
 dependencies = [
  "cargo_metadata 0.12.0",
  "clippy_utils",
  "if_chain",
  "itertools 0.9.0",
  "pulldown-cmark 0.8.0",
  "quine-mc_cluskey",
- "quote",
  "regex-syntax",
  "rustc-semver",
  "semver 0.11.0",
  "serde",
- "smallvec 1.6.1",
- "syn",
  "toml",
  "unicode-normalization",
  "url 2.1.1",
 ]
 
 [[package]]
 name = "clippy_utils"
-version = "0.1.52"
+version = "0.1.53"
 dependencies = [
  "if_chain",
  "itertools 0.9.0",
  "regex-syntax",
  "rustc-semver",
  "serde",
- "smallvec 1.6.1",
- "toml",
  "unicode-normalization",
 ]
 

src/tools/clippy/CHANGELOG.md

@@ -2103,6 +2103,7 @@ Released 2018-09-13
 [`if_let_some_result`]: https://rust-lang.github.io/rust-clippy/master/index.html#if_let_some_result
 [`if_not_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#if_not_else
 [`if_same_then_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#if_same_then_else
+[`if_then_some_else_none`]: https://rust-lang.github.io/rust-clippy/master/index.html#if_then_some_else_none
 [`ifs_same_cond`]: https://rust-lang.github.io/rust-clippy/master/index.html#ifs_same_cond
 [`implicit_clone`]: https://rust-lang.github.io/rust-clippy/master/index.html#implicit_clone
 [`implicit_hasher`]: https://rust-lang.github.io/rust-clippy/master/index.html#implicit_hasher

src/tools/clippy/CONTRIBUTING.md

@@ -18,11 +18,13 @@ All contributors are expected to follow the [Rust Code of Conduct].
     - [Finding something to fix/improve](#finding-something-to-fiximprove)
   - [Writing code](#writing-code)
   - [Getting code-completion for rustc internals to work](#getting-code-completion-for-rustc-internals-to-work)
+    - [IntelliJ Rust](#intellij-rust)
+    - [Rust Analyzer](#rust-analyzer)
   - [How Clippy works](#how-clippy-works)
-  - [Syncing changes between Clippy and `rust-lang/rust`](#syncing-changes-between-clippy-and-rust-langrust)
+  - [Syncing changes between Clippy and [`rust-lang/rust`]](#syncing-changes-between-clippy-and-rust-langrust)
     - [Patching git-subtree to work with big repos](#patching-git-subtree-to-work-with-big-repos)
-    - [Performing the sync from `rust-lang/rust` to Clippy](#performing-the-sync-from-rust-langrust-to-clippy)
-    - [Performing the sync from Clippy to `rust-lang/rust`](#performing-the-sync-from-clippy-to-rust-langrust)
+    - [Performing the sync from [`rust-lang/rust`] to Clippy](#performing-the-sync-from-rust-langrust-to-clippy)
+    - [Performing the sync from Clippy to [`rust-lang/rust`]](#performing-the-sync-from-clippy-to-rust-langrust)
     - [Defining remotes](#defining-remotes)
   - [Issue and PR triage](#issue-and-pr-triage)
   - [Bors and Homu](#bors-and-homu)
@@ -105,21 +107,41 @@ quick read.
 
 ## Getting code-completion for rustc internals to work
 
-Unfortunately, [`rust-analyzer`][ra_homepage] does not (yet?) understand how Clippy uses compiler-internals
+### IntelliJ Rust
+Unfortunately, [`IntelliJ Rust`][IntelliJ_rust_homepage] does not (yet?) understand how Clippy uses compiler-internals
 using `extern crate` and it also needs to be able to read the source files of the rustc-compiler which are not
 available via a `rustup` component at the time of writing.
 To work around this, you need to have a copy of the [rustc-repo][rustc_repo] available which can be obtained via
 `git clone https://github.com/rust-lang/rust/`.
 Then you can run a `cargo dev` command to automatically make Clippy use the rustc-repo via path-dependencies
-which rust-analyzer will be able to understand.
-Run `cargo dev ra_setup --repo-path <repo-path>` where `<repo-path>` is an absolute path to the rustc repo
+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.
 Just make sure to remove the dependencies again before finally making a pull request!
 
-[ra_homepage]: https://rust-analyzer.github.io/
 [rustc_repo]: https://github.com/rust-lang/rust/
+[IntelliJ_rust_homepage]: https://intellij-rust.github.io/
+
+### Rust Analyzer
+As of [#6869][6869], [`rust-analyzer`][ra_homepage] can understand that Clippy uses compiler-internals
+using `extern crate` when `package.metadata.rust-analyzer.rustc_private` is set to `true` in Clippys `Cargo.toml.`
+You will required a `nightly` toolchain with the `rustc-dev` component installed.
+Make sure that in the `rust-analyzer` configuration, you set
+```
+{ "rust-analyzer.rustcSource": "discover" }
+```
+and
+```
+{ "rust-analyzer.updates.channel": "nightly" }
+```
+You should be able to see information on things like `Expr` or `EarlyContext` now if you hover them, also
+a lot more type hints.
+This will work with `rust-analyzer 2021-03-15` shipped in nightly `1.52.0-nightly (107896c32 2021-03-15)` or later.
+
+[ra_homepage]: https://rust-analyzer.github.io/
+[6869]: https://github.com/rust-lang/rust-clippy/pull/6869
 
 ## How Clippy works
 

src/tools/clippy/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "clippy"
-version = "0.1.52"
+version = "0.1.53"
 authors = ["The Rust Clippy Developers"]
 description = "A bunch of helpful lints to avoid common pitfalls in Rust"
 repository = "https://github.com/rust-lang/rust-clippy"
@@ -37,6 +37,8 @@ clippy-mini-macro-test = { version = "0.2", path = "mini-macro" }
 serde = { version = "1.0", features = ["derive"] }
 derive-new = "0.5"
 regex = "1.4"
+quote = "1"
+syn = { version = "1", features = ["full"] }
 
 # A noop dependency that changes in the Rust repository, it's a bit of a hack.
 # See the `src/tools/rustc-workspace-hack/README.md` file in `rust-lang/rust`

src/tools/clippy/clippy_dev/src/fmt.rs

@@ -90,7 +90,7 @@ pub fn run(check: bool, verbose: bool) {
             },
             CliError::RaSetupActive => {
                 eprintln!(
-                    "error: a local rustc repo is enabled as path dependency via `cargo dev ra_setup`.
+                    "error: a local rustc repo is enabled as path dependency via `cargo dev ide_setup`.
 Not formatting because that would format the local repo as well!
 Please revert the changes to Cargo.tomls first."
                 );

src/tools/clippy/clippy_dev/src/ra_setup.rs → src/tools/clippy/clippy_dev/src/ide_setup.rs

@@ -55,7 +55,7 @@ fn inject_deps_into_manifest(
     // do not inject deps if we have aleady done so
     if cargo_toml.contains("[target.'cfg(NOT_A_PLATFORM)'.dependencies]") {
         eprintln!(
-            "cargo dev ra_setup: warning: deps already found inside {}, doing nothing.",
+            "cargo dev ide_setup: warning: deps already found inside {}, doing nothing.",
             manifest_path
         );
         return Ok(());

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

@@ -12,8 +12,8 @@ use walkdir::WalkDir;
 
 pub mod bless;
 pub mod fmt;
+pub mod ide_setup;
 pub mod new_lint;
-pub mod ra_setup;
 pub mod serve;
 pub mod stderr_length_check;
 pub mod update_lints;

src/tools/clippy/clippy_dev/src/main.rs

@@ -1,7 +1,7 @@
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 
 use clap::{App, Arg, ArgMatches, SubCommand};
-use clippy_dev::{bless, fmt, new_lint, ra_setup, serve, stderr_length_check, update_lints};
+use clippy_dev::{bless, fmt, ide_setup, new_lint, serve, stderr_length_check, update_lints};
 fn main() {
     let matches = get_clap_config();
 
@@ -34,7 +34,7 @@ fn main() {
         ("limit_stderr_length", _) => {
             stderr_length_check::check();
         },
-        ("ra_setup", Some(matches)) => ra_setup::run(matches.value_of("rustc-repo-path")),
+        ("ide_setup", Some(matches)) => ide_setup::run(matches.value_of("rustc-repo-path")),
         ("serve", Some(matches)) => {
             let port = matches.value_of("port").unwrap().parse().unwrap();
             let lint = matches.value_of("lint");
@@ -138,8 +138,8 @@ fn get_clap_config<'a>() -> ArgMatches<'a> {
                 .about("Ensures that stderr files do not grow longer than a certain amount of lines."),
         )
         .subcommand(
-            SubCommand::with_name("ra_setup")
-                .about("Alter dependencies so rust-analyzer can find rustc internals")
+            SubCommand::with_name("ide_setup")
+                .about("Alter dependencies so Intellij Rust can find rustc internals")
                 .arg(
                     Arg::with_name("rustc-repo-path")
                         .long("repo-path")

src/tools/clippy/clippy_lints/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "clippy_lints"
 # begin automatic update
-version = "0.1.52"
+version = "0.1.53"
 # end automatic update
 authors = ["The Rust Clippy Developers"]
 description = "A bunch of helpful lints to avoid common pitfalls in Rust"
@@ -20,16 +20,13 @@ pulldown-cmark = { version = "0.8", default-features = false }
 quine-mc_cluskey = "0.2.2"
 regex-syntax = "0.6"
 serde = { version = "1.0", features = ["derive"] }
-smallvec = { version = "1", features = ["union"] }
 toml = "0.5.3"
 unicode-normalization = "0.1"
 semver = "0.11"
 rustc-semver = "1.1.0"
 # NOTE: cargo requires serde feat in its url dep
 # see <https://github.com/rust-lang/rust/pull/63587#issuecomment-522343864>
 url = { version = "2.1.0", features = ["serde"] }
-quote = "1"
-syn = { version = "1", features = ["full"] }
 
 [features]
 deny-warnings = []

src/tools/clippy/clippy_lints/src/approx_const.rs

@@ -1,4 +1,4 @@
-use crate::utils::span_lint;
+use clippy_utils::diagnostics::span_lint;
 use rustc_ast::ast::{FloatTy, LitFloatType, LitKind};
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};

src/tools/clippy/clippy_lints/src/arithmetic.rs

@@ -1,5 +1,5 @@
 use crate::consts::constant_simple;
-use crate::utils::span_lint;
+use clippy_utils::diagnostics::span_lint;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_tool_lint, impl_lint_pass};

src/tools/clippy/clippy_lints/src/as_conversions.rs

@@ -1,10 +1,9 @@
+use clippy_utils::diagnostics::span_lint_and_help;
 use rustc_ast::ast::{Expr, ExprKind};
 use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
-use crate::utils::span_lint_and_help;
-
 declare_clippy_lint! {
     /// **What it does:** Checks for usage of `as` conversions.
     ///

src/tools/clippy/clippy_lints/src/asm_syntax.rs

@@ -1,6 +1,6 @@
 use std::fmt;
 
-use crate::utils::span_lint_and_help;
+use clippy_utils::diagnostics::span_lint_and_help;
 use rustc_ast::ast::{Expr, ExprKind, InlineAsmOptions};
 use rustc_lint::{EarlyContext, EarlyLintPass, Lint};
 use rustc_session::{declare_lint_pass, declare_tool_lint};

src/tools/clippy/clippy_lints/src/assertions_on_constants.rs

@@ -1,5 +1,7 @@
 use crate::consts::{constant, Constant};
-use crate::utils::{is_direct_expn_of, is_expn_of, match_panic_call, snippet_opt, span_lint_and_help};
+use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::source::snippet_opt;
+use clippy_utils::{is_direct_expn_of, is_expn_of, match_panic_call};
 use if_chain::if_chain;
 use rustc_hir::{Expr, ExprKind, UnOp};
 use rustc_lint::{LateContext, LateLintPass};

src/tools/clippy/clippy_lints/src/assign_ops.rs

@@ -1,7 +1,8 @@
-use crate::utils::{
-    eq_expr_value, get_trait_def_id, implements_trait, snippet_opt, span_lint_and_then, trait_ref_of_method,
-};
-use crate::utils::{higher, sugg};
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::implements_trait;
+use clippy_utils::{eq_expr_value, get_trait_def_id, trait_ref_of_method};
+use clippy_utils::{higher, paths, sugg};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
@@ -92,7 +93,7 @@ impl<'tcx> LateLintPass<'tcx> for AssignOps {
                              $($trait_name:ident),+) => {
                                 match $op {
                                     $(hir::BinOpKind::$trait_name => {
-                                        let [krate, module] = crate::utils::paths::OPS_MODULE;
+                                        let [krate, module] = paths::OPS_MODULE;
                                         let path: [&str; 3] = [krate, module, concat!(stringify!($trait_name), "Assign")];
                                         let trait_id = if let Some(trait_id) = get_trait_def_id($cx, &path) {
                                             trait_id

src/tools/clippy/clippy_lints/src/async_yields_async.rs

@@ -1,4 +1,6 @@
-use crate::utils::{implements_trait, snippet, span_lint_and_then};
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::source::snippet;
+use clippy_utils::ty::implements_trait;
 use rustc_errors::Applicability;
 use rustc_hir::{AsyncGeneratorKind, Body, BodyId, ExprKind, GeneratorKind, QPath};
 use rustc_lint::{LateContext, LateLintPass};

src/tools/clippy/clippy_lints/src/atomic_ordering.rs

@@ -1,4 +1,5 @@
-use crate::utils::{match_def_path, span_lint_and_help};
+use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::match_def_path;
 use if_chain::if_chain;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{Expr, ExprKind};

src/tools/clippy/clippy_lints/src/attrs.rs

@@ -1,9 +1,8 @@
 //! checks for attributes
 
-use crate::utils::{
-    first_line_of_span, is_present_in_source, match_panic_def_id, snippet_opt, span_lint, span_lint_and_help,
-    span_lint_and_sugg, span_lint_and_then, without_block_comments,
-};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::match_panic_def_id;
+use clippy_utils::source::{first_line_of_span, is_present_in_source, snippet_opt, without_block_comments};
 use if_chain::if_chain;
 use rustc_ast::{AttrKind, AttrStyle, Attribute, Lit, LitKind, MetaItemKind, NestedMetaItem};
 use rustc_errors::Applicability;
@@ -431,7 +430,7 @@ fn is_relevant_block(cx: &LateContext<'_>, typeck_results: &ty::TypeckResults<'_
         |stmt| match &stmt.kind {
             StmtKind::Local(_) => true,
             StmtKind::Expr(expr) | StmtKind::Semi(expr) => is_relevant_expr(cx, typeck_results, expr),
-            _ => false,
+            StmtKind::Item(_) => false,
         },
     )
 }
@@ -565,7 +564,7 @@ fn check_deprecated_cfg_attr(cx: &EarlyContext<'_>, attr: &Attribute) {
         // check for `rustfmt_skip` and `rustfmt::skip`
         if let Some(skip_item) = &items[1].meta_item();
         if skip_item.has_name(sym!(rustfmt_skip)) ||
-            skip_item.path.segments.last().expect("empty path in attribute").ident.name == sym!(skip);
+            skip_item.path.segments.last().expect("empty path in attribute").ident.name == sym::skip;
         // Only lint outer attributes, because custom inner attributes are unstable
         // Tracking issue: https://github.com/rust-lang/rust/issues/54726
         if let AttrStyle::Outer = attr.style;
@@ -614,7 +613,7 @@ fn check_mismatched_target_os(cx: &EarlyContext<'_>, attr: &Attribute) {
                             }
                         }
                     },
-                    _ => {},
+                    MetaItemKind::NameValue(..) => {},
                 }
             }
         }

src/tools/clippy/clippy_lints/src/await_holding_invalid.rs

@@ -1,4 +1,5 @@
-use crate::utils::{match_def_path, paths, span_lint_and_note};
+use clippy_utils::diagnostics::span_lint_and_note;
+use clippy_utils::{match_def_path, paths};
 use rustc_hir::def_id::DefId;
 use rustc_hir::{AsyncGeneratorKind, Body, BodyId, GeneratorKind};
 use rustc_lint::{LateContext, LateLintPass};

src/tools/clippy/clippy_lints/src/bit_mask.rs

@@ -1,6 +1,6 @@
 use crate::consts::{constant, Constant};
-use crate::utils::sugg::Sugg;
-use crate::utils::{span_lint, span_lint_and_then};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
+use clippy_utils::sugg::Sugg;
 use if_chain::if_chain;
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;

src/tools/clippy/clippy_lints/src/blacklisted_name.rs

@@ -1,4 +1,4 @@
-use crate::utils::span_lint;
+use clippy_utils::diagnostics::span_lint;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::{Pat, PatKind};
 use rustc_lint::{LateContext, LateLintPass};