Use replace_region_in_file for creating the lint list

Author: flip1995

clippy_dev/src/main.rs

@@ -94,25 +94,26 @@ fn update_lints(update_mode: &UpdateMode) {
     let mut sorted_usable_lints = usable_lints.clone();
     sorted_usable_lints.sort_by_key(|lint| lint.name.clone());
 
-    std::fs::write(
+    let mut file_change = replace_region_in_file(
         "../src/lintlist/mod.rs",
-        &format!(
-            "\
-//! This file is managed by `util/dev update_lints`. Do not edit.
-
-pub mod lint;
-pub use lint::Level;
-pub use lint::Lint;
-pub use lint::LINT_LEVELS;
-
-pub const ALL_LINTS: [Lint; {}] = {:#?};\n",
-            sorted_usable_lints.len(),
-            sorted_usable_lints
-        ),
+        "begin lint list",
+        "end lint list",
+        false,
+        update_mode == &UpdateMode::Change,
+        || {
+            format!(
+                "pub const ALL_LINTS: [Lint; {}] = {:#?};",
+                sorted_usable_lints.len(),
+                sorted_usable_lints
+            )
+            .lines()
+            .map(ToString::to_string)
+            .collect::<Vec<_>>()
+        },
     )
-    .expect("can write to file");
+    .changed;
 
-    let mut file_change = replace_region_in_file(
+    file_change |= replace_region_in_file(
         "../README.md",
         r#"\[There are \d+ lints included in this crate!\]\(https://rust-lang.github.io/rust-clippy/master/index.html\)"#,
         "",

src/lintlist/mod.rs

@@ -5,7 +5,8 @@ pub use lint::Level;
 pub use lint::Lint;
 pub use lint::LINT_LEVELS;
 
-pub const ALL_LINTS: [Lint; 304] = [
+// begin lint list, do not remove this comment, it’s used in `update_lints`
+pub const ALL_LINTS: [Lint; 305] = [
     Lint {
         name: "absurd_extreme_comparisons",
         group: "correctness",
@@ -762,6 +763,13 @@ pub const ALL_LINTS: [Lint; 304] = [
         deprecation: None,
         module: "arithmetic",
     },
+    Lint {
+        name: "integer_division",
+        group: "pedantic",
+        desc: "integer division may cause loss of precision",
+        deprecation: None,
+        module: "integer_division",
+    },
     Lint {
         name: "into_iter_on_array",
         group: "correctness",
@@ -2135,3 +2143,4 @@ pub const ALL_LINTS: [Lint; 304] = [
         module: "unicode",
     },
 ];
+// end lint list, do not remove this comment, it’s used in `update_lints`