clippy_dev: check that all lints are registered with a lint pass

Author: Jarcho

clippy_dev/src/update_lints.rs

@@ -3,6 +3,7 @@ use crate::utils::{FileUpdater, UpdateMode, UpdateStatus, update_text_region_fn}
 use itertools::Itertools;
 use std::fmt::Write;
 use std::path::Path;
+use std::process;
 
 const GENERATED_FILE_COMMENT: &str = "// This file was generated by `cargo dev update_lints`.\n\
      // Use that command to update this file and do not edit by hand.\n\
@@ -20,7 +21,24 @@ const DOCS_LINK: &str = "https://rust-lang.github.io/rust-clippy/master/index.ht
 ///
 /// Panics if a file path could not read from or then written to
 pub fn update(update_mode: UpdateMode) {
-    generate_lint_files(update_mode, &ParsedData::collect());
+    let mut data = ParsedData::collect();
+    let mut is_missing = false;
+    data.lint_registrations.sort_by(|x, y| x.name.cmp(&y.name));
+    for (name, lint) in &data.lints {
+        if matches!(lint.kind, LintKind::Active(_))
+            && data.lint_registrations.binary_search_by(|x| x.name.cmp(name)).is_err()
+        {
+            is_missing = true;
+            eprint!(
+                "error: lint `{name}` is not registered in a lint pass\n  declared here: {}\n",
+                lint.name_span.display(&data.source_map)
+            );
+        }
+    }
+    if is_missing {
+        process::exit(1);
+    }
+    generate_lint_files(update_mode, &data);
 }
 
 #[expect(clippy::too_many_lines)]