rust: reenable lint unused_doc_comment

With just local exceptions

rust/src/applayer.rs

@@ -511,6 +511,7 @@ pub type GetStateIdByName = unsafe extern "C" fn(*const c_char, u8) -> c_int;
 pub type GetStateNameById = unsafe extern "C" fn(c_int, u8) -> *const c_char;
 
 // Defined in app-layer-register.h
+#[allow(unused_doc_comments)]
 /// cbindgen:ignore
 extern "C" {
     pub fn AppLayerRegisterProtocolDetection(parser: *const RustParser, enable_default: c_int) -> AppProto;

rust/src/core.rs

@@ -171,6 +171,7 @@ pub struct SuricataFileContext {
     pub files_sbcfg: &'static StreamingBufferConfig,
 }
 
+#[allow(unused_doc_comments)]
 /// cbindgen:ignore
 extern "C" {
     pub fn SCGetContext() -> &'static mut SuricataContext;

rust/src/detect/datasets.rs

@@ -50,6 +50,7 @@ pub enum DatasetType {
 }
 
 // Extern fns operating on the opaque Dataset type above
+#[allow(unused_doc_comments)]
 /// cbindgen:ignore
 extern "C" {
     pub fn DatasetAdd(set: &Dataset, data: *const u8, len: u32) -> i32;

rust/src/filecontainer.rs

@@ -23,6 +23,7 @@ use std::os::raw::{c_void};
 use crate::core::*;
 
 // Defined in util-file.h
+#[allow(unused_doc_comments)]
 /// cbindgen:ignore
 extern "C" {
     pub fn FileFlowFlagsToFlags(flow_file_flags: u16, flags: u8) -> u16;

rust/src/frames.rs

@@ -30,6 +30,7 @@ struct CFrame {
 }
 
 // Defined in app-layer-register.h
+#[allow(unused_doc_comments)]
 /// cbindgen:ignore
 extern "C" {
     #[cfg(not(test))]

rust/src/lib.rs

@@ -49,10 +49,6 @@
 // just due to FFI.
 #![allow(clippy::missing_safety_doc)]
 
-// Allow /// cbindgen:ignore comments on extern blocks
-// cf https://github.com/mozilla/cbindgen/issues/709
-#![allow(unused_doc_comments)]
-
 // Allow unknown lints, our MSRV doesn't know them all, for
 // example static_mut_refs.
 #![allow(unknown_lints)]

rust/src/lua.rs

@@ -24,6 +24,7 @@ use std::os::raw::c_long;
 /// The Rust place holder for lua_State.
 pub enum CLuaState {}
 
+#[allow(unused_doc_comments)]
 /// cbindgen:ignore
 extern "C" {
     fn lua_createtable(lua: *mut CLuaState, narr: c_int, nrec: c_int);