submodules: update clippy from d8b4269 to f5d868c

Fixes clippy toolstate.

Changes:
````
rustup rust-lang/rust#55852
Fix "too" -> "foo" typo in format.rs
Fix `use_self` violation
Fix wrong suggestion for `redundant_closure_call`
Check for common metadata
Fix `use_self` false positive on `use` statements
Fix `use_self` false positive
Remove `+` from `has_unary_equivalent`
Fix dogfood
Update println! formatting
Fix false positive in check mode caused by `gen_deprecated`
RIIR update lints: Add check mode (update_lints.py rewrite complete)
changed into_iter to iter and fixed a lint check
Fix `collapsible_if` error
Fix `possible_missing_comma` false positives
format code
fix comment spacing
change single char str to char
add lint to lintarray macro
Revert "small fix"
small fix
added float support for mistyped literal lints
tmp progress
````

Author: matthiaskrgr

Diff for: CHANGELOG.md

@@ -628,6 +628,7 @@ All notable changes to this project will be documented in this file.
 [`box_vec`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#box_vec
 [`boxed_local`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#boxed_local
 [`builtin_type_shadow`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#builtin_type_shadow
+[`cargo_common_metadata`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#cargo_common_metadata
 [`cast_lossless`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#cast_lossless
 [`cast_possible_truncation`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#cast_possible_truncation
 [`cast_possible_wrap`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#cast_possible_wrap

Diff for: CONTRIBUTING.md

@@ -180,7 +180,7 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry) {
 
 The [`rustc_plugin::PluginRegistry`][plugin_registry] provides two methods to register lints: [register_early_lint_pass][reg_early_lint_pass] and [register_late_lint_pass][reg_late_lint_pass].
 Both take an object that implements an [`EarlyLintPass`][early_lint_pass] or [`LateLintPass`][late_lint_pass] respectively. This is done in every single lint.
-It's worth noting that the majority of `clippy_lints/src/lib.rs` is autogenerated by `util/update_lints.py` and you don't have to add anything by hand. When you are writing your own lint, you can use that script to save you some time.
+It's worth noting that the majority of `clippy_lints/src/lib.rs` is autogenerated by `util/dev update_lints` and you don't have to add anything by hand. When you are writing your own lint, you can use that script to save you some time.
 
 ```rust
 // ./clippy_lints/src/else_if_without_else.rs

Diff for: Cargo.toml

@@ -47,7 +47,7 @@ rustc_tools_util = { version = "0.1.0", path = "rustc_tools_util"}
 
 [dev-dependencies]
 clippy_dev = { version = "0.0.1", path = "clippy_dev" }
-cargo_metadata = "0.6"
+cargo_metadata = "0.6.2"
 compiletest_rs = "0.3.16"
 lazy_static = "1.0"
 serde_derive = "1.0"

Diff for: README.md

@@ -9,7 +9,7 @@ We are currently in the process of discussing Clippy 1.0 via the RFC process in
 
 A collection of lints to catch common mistakes and improve your [Rust](https://github.com/rust-lang/rust) code.
 
-[There are 287 lints included in this crate!](https://rust-lang-nursery.github.io/rust-clippy/master/index.html)
+[There are 288 lints included in this crate!](https://rust-lang-nursery.github.io/rust-clippy/master/index.html)
 
 We have a bunch of lint categories to allow you to choose how much Clippy is supposed to ~~annoy~~ help you:
 

Diff for: ci/base-tests.sh

@@ -23,8 +23,9 @@ cargo test --features debugging
 cd clippy_lints && cargo test && cd ..
 cd rustc_tools_util && cargo test && cd ..
 cd clippy_dev && cargo test && cd ..
-# check that the lint lists are up-to-date
-./util/update_lints.py -c
+
+# Perform various checks for lint registration
+./util/dev update_lints --check
 
 CLIPPY="`pwd`/target/debug/cargo-clippy clippy"
 # run clippy on its own codebase...

Diff for: clippy_dev/src/lib.rs

@@ -114,19 +114,22 @@ pub fn gen_changelog_lint_list(lints: Vec<Lint>) -> Vec<String> {
 
 /// Generates the `register_removed` code in `./clippy_lints/src/lib.rs`.
 pub fn gen_deprecated(lints: &[Lint]) -> Vec<String> {
-    lints.iter()
-        .filter_map(|l| {
-            l.clone().deprecation.and_then(|depr_text| {
-                Some(
-                    format!(
-                        "    store.register_removed(\n        \"{}\",\n        \"{}\",\n    );",
-                        l.name,
-                        depr_text
+    itertools::flatten(
+        lints
+            .iter()
+            .filter_map(|l| {
+                l.clone().deprecation.and_then(|depr_text| {
+                    Some(
+                        vec![
+                            "    store.register_removed(".to_string(),
+                            format!("        \"{}\",", l.name),
+                            format!("        \"{}\",", depr_text),
+                            "    );".to_string()
+                        ]
                     )
-                )
+                })
             })
-        })
-        .collect()
+    ).collect()
 }
 
 /// Gathers all files in `src/clippy_lints` and gathers all lints inside
@@ -168,23 +171,33 @@ fn lint_files() -> impl Iterator<Item=walkdir::DirEntry> {
         .filter(|f| f.path().extension() == Some(OsStr::new("rs")))
 }
 
+/// Whether a file has had its text changed or not
+#[derive(PartialEq, Debug)]
+pub struct FileChange {
+    pub changed: bool,
+    pub new_lines: String,
+}
+
 /// Replace a region in a file delimited by two lines matching regexes.
 ///
 /// `path` is the relative path to the file on which you want to perform the replacement.
 ///
 /// See `replace_region_in_text` for documentation of the other options.
 #[allow(clippy::expect_fun_call)]
-pub fn replace_region_in_file<F>(path: &str, start: &str, end: &str, replace_start: bool, replacements: F) where F: Fn() -> Vec<String> {
+pub fn replace_region_in_file<F>(path: &str, start: &str, end: &str, replace_start: bool, write_back: bool, replacements: F) -> FileChange where F: Fn() -> Vec<String> {
     let mut f = fs::File::open(path).expect(&format!("File not found: {}", path));
     let mut contents = String::new();
     f.read_to_string(&mut contents).expect("Something went wrong reading the file");
-    let replaced = replace_region_in_text(&contents, start, end, replace_start, replacements);
-
-    let mut f = fs::File::create(path).expect(&format!("File not found: {}", path));
-    f.write_all(replaced.as_bytes()).expect("Unable to write file");
-    // Ensure we write the changes with a trailing newline so that
-    // the file has the proper line endings.
-    f.write_all(b"\n").expect("Unable to write file");
+    let file_change = replace_region_in_text(&contents, start, end, replace_start, replacements);
+
+    if write_back {
+        let mut f = fs::File::create(path).expect(&format!("File not found: {}", path));
+        f.write_all(file_change.new_lines.as_bytes()).expect("Unable to write file");
+        // Ensure we write the changes with a trailing newline so that
+        // the file has the proper line endings.
+        f.write_all(b"\n").expect("Unable to write file");
+    }
+    file_change
 }
 
 /// Replace a region in a text delimited by two lines matching regexes.
@@ -213,18 +226,18 @@ pub fn replace_region_in_file<F>(path: &str, start: &str, end: &str, replace_sta
 ///     || {
 ///         vec!["a different".to_string(), "text".to_string()]
 ///     }
-/// );
+/// ).new_lines;
 /// assert_eq!("replace_start\na different\ntext\nreplace_end", result);
 /// ```
-pub fn replace_region_in_text<F>(text: &str, start: &str, end: &str, replace_start: bool, replacements: F) -> String where F: Fn() -> Vec<String> {
+pub fn replace_region_in_text<F>(text: &str, start: &str, end: &str, replace_start: bool, replacements: F) -> FileChange where F: Fn() -> Vec<String> {
     let lines = text.lines();
     let mut in_old_region = false;
     let mut found = false;
     let mut new_lines = vec![];
     let start = Regex::new(start).unwrap();
     let end = Regex::new(end).unwrap();
 
-    for line in lines {
+    for line in lines.clone() {
         if in_old_region {
             if end.is_match(&line) {
                 in_old_region = false;
@@ -248,7 +261,11 @@ pub fn replace_region_in_text<F>(text: &str, start: &str, end: &str, replace_sta
         // is incorrect.
         eprintln!("error: regex `{:?}` not found. You may have to update it.", start);
     }
-    new_lines.join("\n")
+
+    FileChange {
+        changed: lines.ne(new_lines.clone()),
+        new_lines: new_lines.join("\n")
+    }
 }
 
 #[test]
@@ -292,17 +309,11 @@ declare_deprecated_lint! {
 
 #[test]
 fn test_replace_region() {
-    let text = r#"
-abc
-123
-789
-def
-ghi"#;
-    let expected = r#"
-abc
-hello world
-def
-ghi"#;
+    let text = "\nabc\n123\n789\ndef\nghi";
+    let expected = FileChange {
+        changed: true,
+        new_lines: "\nabc\nhello world\ndef\nghi".to_string()
+    };
     let result = replace_region_in_text(text, r#"^\s*abc$"#, r#"^\s*def"#, false, || {
         vec!["hello world".to_string()]
     });
@@ -311,22 +322,30 @@ ghi"#;
 
 #[test]
 fn test_replace_region_with_start() {
-    let text = r#"
-abc
-123
-789
-def
-ghi"#;
-    let expected = r#"
-hello world
-def
-ghi"#;
+    let text = "\nabc\n123\n789\ndef\nghi";
+    let expected = FileChange {
+        changed: true,
+        new_lines: "\nhello world\ndef\nghi".to_string()
+    };
     let result = replace_region_in_text(text, r#"^\s*abc$"#, r#"^\s*def"#, true, || {
         vec!["hello world".to_string()]
     });
     assert_eq!(expected, result);
 }
 
+#[test]
+fn test_replace_region_no_changes() {
+    let text = "123\n456\n789";
+    let expected = FileChange {
+        changed: false,
+        new_lines: "123\n456\n789".to_string()
+    };
+    let result = replace_region_in_text(text, r#"^\s*123$"#, r#"^\s*456"#, false, || {
+        vec![]
+    });
+    assert_eq!(expected, result);
+}
+
 #[test]
 fn test_usable_lints() {
     let lints = vec![
@@ -377,14 +396,19 @@ fn test_gen_changelog_lint_list() {
 fn test_gen_deprecated() {
     let lints = vec![
         Lint::new("should_assert_eq", "group1", "abc", Some("has been superseeded by should_assert_eq2"), "module_name"),
+        Lint::new("another_deprecated", "group2", "abc", Some("will be removed"), "module_name"),
         Lint::new("should_assert_eq2", "group2", "abc", None, "module_name")
     ];
     let expected: Vec<String> = vec![
-        r#"    store.register_removed(
-        "should_assert_eq",
-        "has been superseeded by should_assert_eq2",
-    );"#.to_string()
-    ];
+        "    store.register_removed(",
+        "        \"should_assert_eq\",",
+        "        \"has been superseeded by should_assert_eq2\",",
+        "    );",
+        "    store.register_removed(",
+        "        \"another_deprecated\",",
+        "        \"will be removed\",",
+        "    );"
+    ].into_iter().map(String::from).collect();
     assert_eq!(expected, gen_deprecated(&lints));
 }
 

Diff for: clippy_dev/src/main.rs

@@ -15,6 +15,12 @@ extern crate regex;
 use clap::{App, Arg, SubCommand};
 use clippy_dev::*;
 
+#[derive(PartialEq)]
+enum UpdateMode {
+    Check,
+    Change
+}
+
 fn main() {
     let matches = App::new("Clippy developer tooling")
         .subcommand(
@@ -28,17 +34,23 @@ fn main() {
                 .arg(
                     Arg::with_name("print-only")
                         .long("print-only")
-                        .short("p")
-                        .help("Print a table of lints to STDOUT. This does not include deprecated and internal lints. (Does not modify any files)"),
+                        .help("Print a table of lints to STDOUT. This does not include deprecated and internal lints. (Does not modify any files)")
+                )
+                .arg(
+                    Arg::with_name("check")
+                        .long("check")
+                        .help("Checks that util/dev update_lints has been run. Used on CI."),
                 )
-        )
-        .get_matches();
+            )
+            .get_matches();
 
     if let Some(matches) = matches.subcommand_matches("update_lints") {
         if matches.is_present("print-only") {
             print_lints();
+        } else if matches.is_present("check") {
+            update_lints(&UpdateMode::Check);
         } else {
-            update_lints();
+            update_lints(&UpdateMode::Change);
         }
     }
 }
@@ -63,53 +75,58 @@ fn print_lints() {
     println!("there are {} lints", lint_count);
 }
 
-fn update_lints() {
+fn update_lints(update_mode: &UpdateMode) {
     let lint_list: Vec<Lint> = gather_all().collect();
     let usable_lints: Vec<Lint> = Lint::usable_lints(lint_list.clone().into_iter()).collect();
     let lint_count = usable_lints.len();
 
-    replace_region_in_file(
+    let mut file_change = replace_region_in_file(
         "../README.md",
         r#"\[There are \d+ lints included in this crate!\]\(https://rust-lang-nursery.github.io/rust-clippy/master/index.html\)"#,
         "",
         true,
+        update_mode == &UpdateMode::Change,
         || {
             vec![
                 format!("[There are {} lints included in this crate!](https://rust-lang-nursery.github.io/rust-clippy/master/index.html)", lint_count)
             ]
         }
-    );
+    ).changed;
 
-    replace_region_in_file(
+    file_change |= replace_region_in_file(
         "../CHANGELOG.md",
         "<!-- begin autogenerated links to lint list -->",
         "<!-- end autogenerated links to lint list -->",
         false,
+        update_mode == &UpdateMode::Change,
         || { gen_changelog_lint_list(lint_list.clone()) }
-    );
+    ).changed;
 
-    replace_region_in_file(
+    file_change |= replace_region_in_file(
         "../clippy_lints/src/lib.rs",
         "begin deprecated lints",
         "end deprecated lints",
         false,
+        update_mode == &UpdateMode::Change,
         || { gen_deprecated(&lint_list) }
-    );
+    ).changed;
 
-    replace_region_in_file(
+    file_change |= replace_region_in_file(
         "../clippy_lints/src/lib.rs",
         "begin lints modules",
         "end lints modules",
         false,
+        update_mode == &UpdateMode::Change,
         || { gen_modules_list(lint_list.clone()) }
-    );
+    ).changed;
 
     // Generate lists of lints in the clippy::all lint group
-    replace_region_in_file(
+    file_change |= replace_region_in_file(
         "../clippy_lints/src/lib.rs",
         r#"reg.register_lint_group\("clippy::all""#,
         r#"\]\);"#,
         false,
+        update_mode == &UpdateMode::Change,
         || {
             // clippy::all should only include the following lint groups:
             let all_group_lints = usable_lints.clone().into_iter().filter(|l| {
@@ -121,16 +138,22 @@ fn update_lints() {
 
             gen_lint_group_list(all_group_lints)
         }
-    );
+    ).changed;
 
     // Generate the list of lints for all other lint groups
     for (lint_group, lints) in Lint::by_lint_group(&usable_lints) {
-        replace_region_in_file(
+        file_change |= replace_region_in_file(
             "../clippy_lints/src/lib.rs",
             &format!("reg.register_lint_group\\(\"clippy::{}\"", lint_group),
             r#"\]\);"#,
             false,
+            update_mode == &UpdateMode::Change,
             || { gen_lint_group_list(lints.clone()) }
-        );
+        ).changed;
+    }
+
+    if update_mode == &UpdateMode::Check && file_change {
+      println!("Not all lints defined properly. Please run `util/dev update_lints` to make sure all lints are defined properly.");
+      std::process::exit(1);
     }
 }

Diff for: clippy_lints/Cargo.toml

@@ -17,7 +17,7 @@ keywords = ["clippy", "lint", "plugin"]
 edition = "2018"
 
 [dependencies]
-cargo_metadata = "0.6"
+cargo_metadata = "0.6.2"
 itertools = "0.7"
 lazy_static = "1.0.2"
 matches = "0.1.7"