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Auto merge of rust-lang#72972 - lzutao:clippy, r=Manishearth
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3 changes: 2 additions & 1 deletion src/tools/clippy/.github/workflows/clippy_bors.yml
Original file line number Diff line number Diff line change
Expand Up @@ -232,7 +232,8 @@ jobs:
matrix:
integration:
- 'rust-lang/cargo'
- 'rust-lang/rls'
# FIXME: re-enable once fmt_macros is renamed in RLS
# - 'rust-lang/rls'
- 'rust-lang/chalk'
- 'rust-lang/rustfmt'
- 'Marwes/combine'
Expand Down
87 changes: 84 additions & 3 deletions src/tools/clippy/CHANGELOG.md
Original file line number Diff line number Diff line change
Expand Up @@ -6,11 +6,88 @@ document.

## Unreleased / In Rust Nightly

[891e1a8...master](https://github.com/rust-lang/rust-clippy/compare/891e1a8...master)
[7ea7cd1...master](https://github.com/rust-lang/rust-clippy/compare/7ea7cd1...master)

## Rust 1.45

Current beta, release 2020-07-16

[891e1a8...7ea7cd1](https://github.com/rust-lang/rust-clippy/compare/891e1a8...7ea7cd1)

### New lints

* [`match_wildcard_for_single_variants`] [#5582](https://github.com/rust-lang/rust-clippy/pull/5582)
* [`unsafe_derive_deserialize`] [#5493](https://github.com/rust-lang/rust-clippy/pull/5493)
* [`if_let_mutex`] [#5332](https://github.com/rust-lang/rust-clippy/pull/5332)
* [`mismatched_target_os`] [#5506](https://github.com/rust-lang/rust-clippy/pull/5506)
* [`await_holding_lock`] [#5439](https://github.com/rust-lang/rust-clippy/pull/5439)
* [`match_on_vec_items`] [#5522](https://github.com/rust-lang/rust-clippy/pull/5522)
* [`manual_async_fn`] [#5576](https://github.com/rust-lang/rust-clippy/pull/5576)
* [`reversed_empty_ranges`] [#5583](https://github.com/rust-lang/rust-clippy/pull/5583)
* [`manual_non_exhaustive`] [#5550](https://github.com/rust-lang/rust-clippy/pull/5550)

### Moves and Deprecations

* Downgrade [`match_bool`] to pedantic [#5408](https://github.com/rust-lang/rust-clippy/pull/5408)
* Downgrade [`match_wild_err_arm`] to pedantic and update help messages. [#5622](https://github.com/rust-lang/rust-clippy/pull/5622)
* Downgrade [`useless_let_if_seq`] to nursery. [#5599](https://github.com/rust-lang/rust-clippy/pull/5599)
* Generalize `option_and_then_some` and rename to [`bind_instead_of_map`]. [#5529](https://github.com/rust-lang/rust-clippy/pull/5529)
* Rename `identity_conversion` to [`useless_conversion`]. [#5568](https://github.com/rust-lang/rust-clippy/pull/5568)
* Merge `block_in_if_condition_expr` and `block_in_if_condition_stmt` into [`blocks_in_if_conditions`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
* Merge `option_map_unwrap_or`, `option_map_unwrap_or_else` and `result_map_unwrap_or_else` into [`map_unwrap_or`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
* Merge `option_unwrap_used` and `result_unwrap_used` into [`unwrap_used`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
* Merge `option_expect_used` and `result_expect_used` into [`expect_used`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
* Merge `for_loop_over_option` and `for_loop_over_result` into [`for_loops_over_fallibles`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)

### Enhancements

* Avoid running cargo lints when not enabled to improve performance. [#5505](https://github.com/rust-lang/rust-clippy/pull/5505)
* Extend [`useless_conversion`] with `TryFrom` and `TryInto`. [#5631](https://github.com/rust-lang/rust-clippy/pull/5631)
* Lint also in type parameters and where clauses in [`unused_unit`]. [#5592](https://github.com/rust-lang/rust-clippy/pull/5592)
* Do not suggest deriving `Default` in [`new_without_default`]. [#5616](https://github.com/rust-lang/rust-clippy/pull/5616)

### False Positive Fixes

* [`while_let_on_iterator`] [#5525](https://github.com/rust-lang/rust-clippy/pull/5525)
* [`empty_line_after_outer_attr`] [#5609](https://github.com/rust-lang/rust-clippy/pull/5609)
* [`unnecessary_unwrap`] [#5558](https://github.com/rust-lang/rust-clippy/pull/5558)
* [`comparison_chain`] [#5596](https://github.com/rust-lang/rust-clippy/pull/5596)
* Don't trigger [`used_underscore_binding`] in await desugaring. [#5535](https://github.com/rust-lang/rust-clippy/pull/5535)
* Don't trigger [`borrowed_box`] on mutable references. [#5491](https://github.com/rust-lang/rust-clippy/pull/5491)
* Allow `1 << 0` in [`identity_op`]. [#5602](https://github.com/rust-lang/rust-clippy/pull/5602)
* Allow `use super::*;` glob imports in [`wildcard_imports`]. [#5564](https://github.com/rust-lang/rust-clippy/pull/5564)
* Whitelist more words in [`doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611)
* Skip dev and build deps in [`multiple_crate_versions`]. [#5636](https://github.com/rust-lang/rust-clippy/pull/5636)
* Honor `allow` attribute on arguments in [`ptr_arg`]. [#5647](https://github.com/rust-lang/rust-clippy/pull/5647)
* Honor lint level attributes for [`redundant_field_names`], [`just_underscores_and_digits`], [`many_single_char_names`]
and [`similar_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/5651)
* Ignore calls to `len` in [`or_fun_call`]. [#4429](https://github.com/rust-lang/rust-clippy/pull/4429)

### Suggestion Improvements

* Simplify suggestions in [`manual_memcpy`]. [#5536](https://github.com/rust-lang/rust-clippy/pull/5536)
* Fix suggestion in [`redundant_pattern_matching`] for macros. [#5511](https://github.com/rust-lang/rust-clippy/pull/5511)
* Avoid suggesting `copied()` for mutable references in [`map_clone`]. [#5530](https://github.com/rust-lang/rust-clippy/pull/5530)
* Improve help message for [`clone_double_ref`]. [#5547](https://github.com/rust-lang/rust-clippy/pull/5547)

### ICE Fixes

* Fix ICE caused in unwrap module. [#5590](https://github.com/rust-lang/rust-clippy/pull/5590)
* Fix ICE on rustc test issue-69020-assoc-const-arith-overflow.rs [#5499](https://github.com/rust-lang/rust-clippy/pull/5499)

### Documentation

* Clarify the documentation of [`unnecessary_mut_passed`]. [#5639](https://github.com/rust-lang/rust-clippy/pull/5639)
* Extend example for [`unneeded_field_pattern`]. [#5541](https://github.com/rust-lang/rust-clippy/pull/5541)

## Rust 1.44

Current beta, release 2020-06-04
Current stable, released 2020-06-04

[204bb9b...891e1a8](https://github.com/rust-lang/rust-clippy/compare/204bb9b...891e1a8)

Expand Down Expand Up @@ -93,7 +170,7 @@ Current beta, release 2020-06-04

## Rust 1.43

Current stable, released 2020-04-23
Released 2020-04-23

[4ee1206...204bb9b](https://github.com/rust-lang/rust-clippy/compare/4ee1206...204bb9b)

Expand Down Expand Up @@ -1401,6 +1478,7 @@ Released 2018-09-13
[`items_after_statements`]: https://rust-lang.github.io/rust-clippy/master/index.html#items_after_statements
[`iter_cloned_collect`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_cloned_collect
[`iter_next_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_next_loop
[`iter_next_slice`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_next_slice
[`iter_nth`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_nth
[`iter_nth_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_nth_zero
[`iter_skip_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_skip_next
Expand Down Expand Up @@ -1601,9 +1679,11 @@ Released 2018-09-13
[`unnecessary_fold`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_fold
[`unnecessary_mut_passed`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
[`unnecessary_operation`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_operation
[`unnecessary_sort_by`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_sort_by
[`unnecessary_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_unwrap
[`unneeded_field_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[`unneeded_wildcard_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_wildcard_pattern
[`unnested_or_patterns`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnested_or_patterns
[`unreachable`]: https://rust-lang.github.io/rust-clippy/master/index.html#unreachable
[`unreadable_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[`unsafe_derive_deserialize`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsafe_derive_deserialize
Expand All @@ -1630,6 +1710,7 @@ Released 2018-09-13
[`useless_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_transmute
[`useless_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_vec
[`vec_box`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_box
[`vec_resize_to_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_resize_to_zero
[`verbose_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_bit_mask
[`verbose_file_reads`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_file_reads
[`vtable_address_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#vtable_address_comparisons
Expand Down
36 changes: 28 additions & 8 deletions src/tools/clippy/CONTRIBUTING.md
Original file line number Diff line number Diff line change
Expand Up @@ -12,14 +12,16 @@ anything, feel free to ask questions on issues or visit the `#clippy` on [Discor

All contributors are expected to follow the [Rust Code of Conduct].

* [Getting started](#getting-started)
* [Finding something to fix/improve](#finding-something-to-fiximprove)
* [Writing code](#writing-code)
* [How Clippy works](#how-clippy-works)
* [Fixing nightly build failures](#fixing-build-failures-caused-by-rust)
* [Issue and PR Triage](#issue-and-pr-triage)
* [Bors and Homu](#bors-and-homu)
* [Contributions](#contributions)
- [Contributing to Clippy](#contributing-to-clippy)
- [Getting started](#getting-started)
- [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)
- [How Clippy works](#how-clippy-works)
- [Fixing build failures caused by Rust](#fixing-build-failures-caused-by-rust)
- [Issue and PR triage](#issue-and-pr-triage)
- [Bors and Homu](#bors-and-homu)
- [Contributions](#contributions)

[Discord]: https://discord.gg/rust-lang
[Rust Code of Conduct]: https://www.rust-lang.org/policies/code-of-conduct
Expand Down Expand Up @@ -91,6 +93,24 @@ quick read.
[rfc_stability]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md#stability-guarantees
[rfc_lint_cats]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md#lint-audit-and-categories

## Getting code-completion for rustc internals to work

Unfortunately, [`rust-analyzer`][ra_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
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/

## How Clippy works

[`clippy_lints/src/lib.rs`][lint_crate_entry] imports all the different lint modules and registers in the [`LintStore`].
Expand Down
2 changes: 1 addition & 1 deletion src/tools/clippy/Cargo.toml
Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ tempfile = { version = "3.1.0", optional = true }
lazy_static = "1.0"

[dev-dependencies]
cargo_metadata = "0.9.0"
cargo_metadata = "0.9.1"
compiletest_rs = { version = "0.5.0", features = ["tmp"] }
tester = "0.7"
lazy_static = "1.0"
Expand Down
3 changes: 2 additions & 1 deletion src/tools/clippy/clippy_dev/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ use walkdir::WalkDir;

pub mod fmt;
pub mod new_lint;
pub mod ra_setup;
pub mod stderr_length_check;
pub mod update_lints;

Expand Down Expand Up @@ -400,7 +401,7 @@ fn test_replace_region_no_changes() {
changed: false,
new_lines: "123\n456\n789".to_string(),
};
let result = replace_region_in_text(text, r#"^\s*123$"#, r#"^\s*456"#, false, || vec![]);
let result = replace_region_in_text(text, r#"^\s*123$"#, r#"^\s*456"#, false, Vec::new);
assert_eq!(expected, result);
}

Expand Down
16 changes: 15 additions & 1 deletion src/tools/clippy/clippy_dev/src/main.rs
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
#![cfg_attr(feature = "deny-warnings", deny(warnings))]

use clap::{App, Arg, SubCommand};
use clippy_dev::{fmt, new_lint, stderr_length_check, update_lints};
use clippy_dev::{fmt, new_lint, ra_setup, stderr_length_check, update_lints};

fn main() {
let matches = App::new("Clippy developer tooling")
Expand Down Expand Up @@ -87,6 +87,19 @@ fn main() {
SubCommand::with_name("limit_stderr_length")
.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")
.arg(
Arg::with_name("rustc-repo-path")
.long("repo-path")
.short("r")
.help("The path to a rustc repo that will be used for setting the dependencies")
.takes_value(true)
.value_name("path")
.required(true),
),
)
.get_matches();

match matches.subcommand() {
Expand Down Expand Up @@ -115,6 +128,7 @@ fn main() {
("limit_stderr_length", _) => {
stderr_length_check::check();
},
("ra-setup", Some(matches)) => ra_setup::run(matches.value_of("rustc-repo-path")),
_ => {},
}
}
2 changes: 2 additions & 0 deletions src/tools/clippy/clippy_dev/src/new_lint.rs
Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,8 @@ fn get_manifest_contents(lint_name: &str, hint: &str) -> String {
name = "{}"
version = "0.1.0"
publish = false
[workspace]
"#,
hint, lint_name
)
Expand Down
90 changes: 90 additions & 0 deletions src/tools/clippy/clippy_dev/src/ra_setup.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,90 @@
#![allow(clippy::filter_map)]

use std::fs;
use std::fs::File;
use std::io::prelude::*;
use std::path::PathBuf;

// This module takes an absolute path to a rustc repo and alters the dependencies to point towards
// the respective rustc subcrates instead of using extern crate xyz.
// This allows rust analyzer to analyze rustc internals and show proper information inside clippy
// code. See https://github.com/rust-analyzer/rust-analyzer/issues/3517 and https://github.com/rust-lang/rust-clippy/issues/5514 for details

pub fn run(rustc_path: Option<&str>) {
// we can unwrap here because the arg is required here
let rustc_path = PathBuf::from(rustc_path.unwrap());
assert!(rustc_path.is_dir(), "path is not a directory");
let rustc_source_basedir = rustc_path.join("src");
assert!(
rustc_source_basedir.is_dir(),
"are you sure the path leads to a rustc repo?"
);

let clippy_root_manifest = fs::read_to_string("Cargo.toml").expect("failed to read ./Cargo.toml");
let clippy_root_lib_rs = fs::read_to_string("src/driver.rs").expect("failed to read ./src/driver.rs");
inject_deps_into_manifest(
&rustc_source_basedir,
"Cargo.toml",
&clippy_root_manifest,
&clippy_root_lib_rs,
)
.expect("Failed to inject deps into ./Cargo.toml");

let clippy_lints_manifest =
fs::read_to_string("clippy_lints/Cargo.toml").expect("failed to read ./clippy_lints/Cargo.toml");
let clippy_lints_lib_rs =
fs::read_to_string("clippy_lints/src/lib.rs").expect("failed to read ./clippy_lints/src/lib.rs");
inject_deps_into_manifest(
&rustc_source_basedir,
"clippy_lints/Cargo.toml",
&clippy_lints_manifest,
&clippy_lints_lib_rs,
)
.expect("Failed to inject deps into ./clippy_lints/Cargo.toml");
}

fn inject_deps_into_manifest(
rustc_source_dir: &PathBuf,
manifest_path: &str,
cargo_toml: &str,
lib_rs: &str,
) -> std::io::Result<()> {
let extern_crates = lib_rs
.lines()
// get the deps
.filter(|line| line.starts_with("extern crate"))
// we have something like "extern crate foo;", we only care about the "foo"
// ↓ ↓
// extern crate rustc_middle;
.map(|s| &s[13..(s.len() - 1)]);

let new_deps = extern_crates.map(|dep| {
// format the dependencies that are going to be put inside the Cargo.toml
format!(
"{dep} = {{ path = \"{source_path}/lib{dep}\" }}\n",
dep = dep,
source_path = rustc_source_dir.display()
)
});

// format a new [dependencies]-block with the new deps we need to inject
let mut all_deps = String::from("[dependencies]\n");
new_deps.for_each(|dep_line| {
all_deps.push_str(&dep_line);
});

// replace "[dependencies]" with
// [dependencies]
// dep1 = { path = ... }
// dep2 = { path = ... }
// etc
let new_manifest = cargo_toml.replacen("[dependencies]\n", &all_deps, 1);

// println!("{}", new_manifest);
let mut file = File::create(manifest_path)?;
file.write_all(new_manifest.as_bytes())?;

println!("Dependency paths injected: {}", manifest_path);

Ok(())
}
4 changes: 2 additions & 2 deletions src/tools/clippy/clippy_lints/Cargo.toml
Original file line number Diff line number Diff line change
Expand Up @@ -17,11 +17,11 @@ keywords = ["clippy", "lint", "plugin"]
edition = "2018"

[dependencies]
cargo_metadata = "0.9.0"
cargo_metadata = "0.9.1"
if_chain = "1.0.0"
itertools = "0.9"
lazy_static = "1.0.2"
pulldown-cmark = { version = "0.7", default-features = false }
pulldown-cmark = { version = "0.7.1", default-features = false }
quine-mc_cluskey = "0.2.2"
regex-syntax = "0.6"
serde = { version = "1.0", features = ["derive"] }
Expand Down
4 changes: 4 additions & 0 deletions src/tools/clippy/clippy_lints/src/assign_ops.rs
Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,11 @@ declare_clippy_lint! {
/// let mut a = 5;
/// let b = 0;
/// // ...
/// // Bad
/// a = a + b;
///
/// // Good
/// a += b;
/// ```
pub ASSIGN_OP_PATTERN,
style,
Expand Down
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