move rustdoc feature handling to doc_auto_cfg with docsrs cfg

Author: stbuehler

.github/workflows/rust.yml

@@ -86,7 +86,7 @@ jobs:
       - name: Rustdoc [nightly]
         env:
           # this should need nightly
-          RUSTDOCFLAGS: "--cfg doc_cfg"
+          RUSTDOCFLAGS: "--cfg docsrs"
         run: cargo doc --all-features
       # deploy docs from nightly for doc_cfg feature
       # (for stable we'd create a new job and use the cache)

Cargo.toml

@@ -34,7 +34,3 @@ version-sync = "0.9.1"
 [package.metadata.docs.rs]
 all-features = true
 targets = []
-
-[lints.rust]
-# allow #[cfg_attr(doc_cfg, doc(cfg(...)))]
-unexpected_cfgs = { level = "warn", check-cfg = ['cfg(doc_cfg)'] }

src/cidr/any.rs

@@ -295,7 +295,6 @@ impl From<IpAddr> for AnyIpCidr {
 }
 
 #[cfg(feature = "bitstring")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "bitstring")))]
 impl bitstring::BitString for AnyIpCidr {
 	fn get(&self, ndx: usize) -> bool {
 		assert!(!self.is_any());

src/cidr/direct.rs

@@ -1,5 +1,4 @@
 #[cfg(feature = "bitstring")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "bitstring")))]
 use bitstring::FixedBitString;
 
 use core::{
@@ -32,7 +31,6 @@ use crate::{
 macro_rules! impl_cidr_for {
 	($n:ident : inet $inet:ident : addr $addr:ident : pair $pair:ident : family $family:expr) => {
 		#[cfg(feature = "bitstring")]
-		#[cfg_attr(doc_cfg, doc(cfg(feature = "bitstring")))]
 		impl bitstring::BitString for $n {
 			fn get(&self, ndx: usize) -> bool {
 				self.address.get(ndx)

src/cidr/serde/mod.rs

@@ -1,5 +1,4 @@
 #![cfg(feature = "serde")]
-#![cfg_attr(doc_cfg, doc(cfg(feature = "serde")))]
 
 use crate::{
 	cidr::{

src/errors.rs

@@ -5,7 +5,6 @@ use core::{
 	num::ParseIntError,
 };
 #[cfg(feature = "std")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
 use std::error::Error;
 use std::net::AddrParseError;
 
@@ -39,7 +38,6 @@ impl fmt::Display for NetworkLengthTooLongError {
 }
 
 #[cfg(feature = "std")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
 impl Error for NetworkLengthTooLongError {
 	fn description(&self) -> &str {
 		"network length too long"
@@ -86,7 +84,6 @@ impl fmt::Display for NetworkParseError {
 }
 
 #[cfg(feature = "std")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
 impl Error for NetworkParseError {
 	fn description(&self) -> &str {
 		"network parse error"
@@ -149,7 +146,6 @@ impl fmt::Display for InetTupleError {
 }
 
 #[cfg(feature = "std")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
 impl Error for InetTupleError {
 	fn description(&self) -> &str {
 		"inet tuple error"

src/inet/direct.rs

@@ -1,5 +1,4 @@
 #[cfg(feature = "bitstring")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "bitstring")))]
 use bitstring::FixedBitString;
 
 use core::{
@@ -29,7 +28,6 @@ use crate::{
 macro_rules! impl_inet_for {
 	($n:ident : cidr $cidr:ident : addr $addr:ident : pair $pair:ident : family $family:expr) => {
 		#[cfg(feature = "bitstring")]
-		#[cfg_attr(doc_cfg, doc(cfg(feature = "bitstring")))]
 		impl bitstring::BitString for $n {
 			fn get(&self, ndx: usize) -> bool {
 				self.address.get(ndx)

src/inet/serde/mod.rs

@@ -1,5 +1,4 @@
 #![cfg(feature = "serde")]
-#![cfg_attr(doc_cfg, doc(cfg(feature = "serde")))]
 
 use crate::{
 	inet::{

src/lib.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(doc_cfg, feature(doc_cfg))]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(feature = "no_unsafe", forbid(unsafe_code))]
 #![warn(missing_docs)]

src/serde_common.rs

@@ -1,5 +1,4 @@
 #![cfg(feature = "serde")]
-#![cfg_attr(doc_cfg, doc(cfg(feature = "serde")))]
 
 use core::fmt;
 use serde::{