Apply review comments + use shallow_lint_levels_on

Author: blyxyas

clippy_lints/src/ctfe.rs

@@ -7,7 +7,7 @@ use rustc_session::declare_lint_pass;
 use rustc_span::Span;
 
 /// Ensures that Constant-time Function Evaluation is being done (specifically, MIR lint passes).
-/// See rust-lang/rust#125116 for more info.
+/// As Clippy deactivates codegen, this lint ensures that CTFE (used in hard errors) is still ran.
 #[clippy::version = "1.82.0"]
 pub static CLIPPY_CTFE: &Lint = &Lint {
     name: &"clippy::CLIPPY_CTFE",

clippy_lints/src/lib.rs

@@ -65,7 +65,7 @@ extern crate clippy_utils;
 #[cfg_attr(feature = "internal", allow(clippy::missing_clippy_version_attribute))]
 mod utils;
 
-pub mod ctfe; // Very important lint (rust#125116)
+pub mod ctfe; // Very important lint, do not remove (rust#125116)
 pub mod declared_lints;
 pub mod deprecated_lints;