Auto merge of #4650 - Mark-Simulacrum:clippy-up-lintstore-lockless, r=phansch

Update clippy for latest rustc changes

Specifically, this revises the clippy integration to utilize a new
callback to register its lints, as the prior editing of lint store in
Session is no longer possible.

---

changelog: none

Author: bors

CONTRIBUTING.md

@@ -147,7 +147,7 @@ You can use [rustup-toolchain-install-master][rtim] to do that:
 
 ```bash
 cargo install rustup-toolchain-install-master
-rustup-toolchain-install-master --force -n master
+rustup-toolchain-install-master --force -n master -c rustc-dev
 rustup override set master
 cargo test
 ```

appveyor.yml

@@ -25,7 +25,7 @@ install:
     - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
     - del rust-toolchain
     - cargo install -Z install-upgrade rustup-toolchain-install-master
-    - rustup-toolchain-install-master -f -n master
+    - rustup-toolchain-install-master -f -n master -c rustc-dev
     - rustup component add rustfmt --toolchain nightly & exit 0 # Format test handles missing rustfmt
     - rustup default master
     - set PATH=%PATH%;C:\Users\appveyor\.rustup\toolchains\master\bin

clippy_dev/src/lib.rs

@@ -82,7 +82,7 @@ pub fn gen_lint_group_list(lints: Vec<Lint>) -> Vec<String> {
             if l.is_internal() || l.deprecation.is_some() {
                 None
             } else {
-                Some(format!("        {}::{},", l.module, l.name.to_uppercase()))
+                Some(format!("        LintId::of(&{}::{}),", l.module, l.name.to_uppercase()))
             }
         })
         .sorted()
@@ -143,6 +143,26 @@ pub fn gen_deprecated(lints: &[Lint]) -> Vec<String> {
         .collect::<Vec<String>>()
 }
 
+#[must_use]
+pub fn gen_register_lint_list(lints: &[Lint]) -> Vec<String> {
+    let pre = "    store.register_lints(&[".to_string();
+    let post = "    ]);".to_string();
+    let mut inner = lints
+        .iter()
+        .filter_map(|l| {
+            if !l.is_internal() && l.deprecation.is_none() {
+                Some(format!("        &{}::{},", l.module, l.name.to_uppercase()))
+            } else {
+                None
+            }
+        })
+        .sorted()
+        .collect::<Vec<String>>();
+    inner.insert(0, pre);
+    inner.push(post);
+    inner
+}
+
 /// Gathers all files in `src/clippy_lints` and gathers all lints inside
 pub fn gather_all() -> impl Iterator<Item = Lint> {
     lint_files().flat_map(|f| gather_from_file(&f))
@@ -487,8 +507,8 @@ fn test_gen_lint_group_list() {
         Lint::new("incorrect_internal", "internal_style", "abc", None, "module_name"),
     ];
     let expected = vec![
-        "        module_name::ABC,".to_string(),
-        "        module_name::SHOULD_ASSERT_EQ,".to_string(),
+        "        LintId::of(&module_name::ABC),".to_string(),
+        "        LintId::of(&module_name::SHOULD_ASSERT_EQ),".to_string(),
     ];
     assert_eq!(expected, gen_lint_group_list(lints));
 }

clippy_dev/src/main.rs

@@ -109,6 +109,7 @@ fn print_lints() {
     println!("there are {} lints", lint_count);
 }
 
+#[allow(clippy::too_many_lines)]
 fn update_lints(update_mode: &UpdateMode) {
     let lint_list: Vec<Lint> = gather_all().collect();
 
@@ -170,6 +171,16 @@ fn update_lints(update_mode: &UpdateMode) {
     )
     .changed;
 
+    file_change |= replace_region_in_file(
+        "../clippy_lints/src/lib.rs",
+        "begin register lints",
+        "end register lints",
+        false,
+        update_mode == &UpdateMode::Change,
+        || gen_register_lint_list(&lint_list),
+    )
+    .changed;
+
     file_change |= replace_region_in_file(
         "../clippy_lints/src/lib.rs",
         "begin lints modules",
@@ -183,7 +194,7 @@ fn update_lints(update_mode: &UpdateMode) {
     // Generate lists of lints in the clippy::all lint group
     file_change |= replace_region_in_file(
         "../clippy_lints/src/lib.rs",
-        r#"reg.register_lint_group\("clippy::all""#,
+        r#"store.register_group\(true, "clippy::all""#,
         r#"\]\);"#,
         false,
         update_mode == &UpdateMode::Change,
@@ -206,7 +217,7 @@ fn update_lints(update_mode: &UpdateMode) {
     for (lint_group, lints) in Lint::by_lint_group(&usable_lints) {
         file_change |= replace_region_in_file(
             "../clippy_lints/src/lib.rs",
-            &format!("reg.register_lint_group\\(\"clippy::{}\"", lint_group),
+            &format!("store.register_group\\(true, \"clippy::{}\"", lint_group),
             r#"\]\);"#,
             false,
             update_mode == &UpdateMode::Change,