Check that all configuration options reference existing lints

tests/config-consistency.rs

@@ -0,0 +1,30 @@
+#![feature(rustc_private)]
+
+// This test checks that all lints defined in `clippy_config::conf` in `#[lints]`
+// attributes exist as Clippy lints.
+//
+// This test is a no-op if run as part of the compiler test suite
+// and will always succeed.
+
+use std::collections::HashSet;
+
+#[test]
+fn config_consistency() {
+    if option_env!("RUSTC_TEST_SUITE").is_some() {
+        return;
+    }
+
+    let lint_names: HashSet<String> = clippy_lints::declared_lints::LINTS
+        .iter()
+        .map(|lint_info| lint_info.lint.name.strip_prefix("clippy::").unwrap().to_lowercase())
+        .collect();
+    for conf in clippy_config::get_configuration_metadata() {
+        for lint in conf.lints {
+            assert!(
+                lint_names.contains(*lint),
+                "Configuration option {} references lint `{lint}` which does not exist",
+                conf.name
+            );
+        }
+    }
+}