Update smoke test to verify all Clippy and rustc lints

src/lib.rs

@@ -590,7 +590,9 @@ macro_rules! bitflags {
             unused_mut,
             unused_imports,
             non_upper_case_globals,
-            clippy::assign_op_pattern
+            clippy::assign_op_pattern,
+            clippy::indexing_slicing,
+            clippy::same_name_method
         )]
         const _: () = {
             // Declared in a "hidden" scope that can't be reached directly

tests/smoke-test/src/main.rs

@@ -1,19 +1,66 @@
-#![deny(warnings)]
+#![allow(unknown_lints)]
+#![deny(clippy::all, clippy::pedantic, clippy::restriction)]
+#![allow(clippy::blanket_clippy_restriction_lints)]
+// deny all rustc's built-in lints
+#![deny(
+    warnings,
+    future_incompatible,
+    let_underscore,
+    nonstandard_style,
+    rust_2018_compatibility,
+    rust_2018_idioms,
+    rust_2021_compatibility,
+    unused
+)]
+// deny additional allow by default from rustc
+#![deny(
+    deprecated_in_future,
+    ffi_unwind_calls,
+    macro_use_extern_crate,
+    meta_variable_misuse,
+    missing_abi,
+    missing_copy_implementations,
+    missing_debug_implementations,
+    missing_docs,
+    non_ascii_idents,
+    noop_method_call,
+    single_use_lifetimes,
+    trivial_casts,
+    trivial_numeric_casts,
+    unreachable_pub,
+    unsafe_code,
+    unsafe_op_in_unsafe_fn,
+    unused_crate_dependencies,
+    unused_import_braces,
+    unused_lifetimes,
+    unused_qualifications,
+    unused_results,
+    unused_tuple_struct_fields,
+    variant_size_differences
+)]
+
+//! An example file for smoke tests
 
 use bitflags::bitflags;
 
 bitflags! {
     #[derive(Debug)]
+    /// Example Flags
     pub struct Flags: u32 {
-        const A = 0b00000001;
-        const B = 0b00000010;
-        const C = 0b00000100;
+        /// A
+        const A = 0b0000_0001;
+        /// B
+        const B = 0b0000_0010;
+        /// C
+        const C = 0b0000_0100;
+        /// ABC
         const ABC = Flags::A.bits() | Flags::B.bits() | Flags::C.bits();
 
         const _ = !0;
     }
 }
 
+#[allow(clippy::print_stdout, clippy::use_debug)]
 fn main() {
     println!("{:?}", Flags::ABC);
 }