From fb4f0be1f3f2563e0f89bd8b507dc57cc162ff74 Mon Sep 17 00:00:00 2001
From: DerZade <DerZade@gmail.com>
Date: Tue, 5 Sep 2023 20:55:48 +0200
Subject: [PATCH 1/2] feat: implement std::error::Error for InvalidBits

implement std::error::Error for InvalidBits and hide it behind a "std"-feature-flag to ensure non_std compatibility out of the box
---
 Cargo.toml | 3 +++
 src/lib.rs | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 20daf2a..2aef39f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,9 @@ homepage = "https://github.com/enarx/flagset"
 documentation = "https://docs.rs/flagset"
 description = "Data types and a macro for generating enumeration-based bit flags"
 
+[features]
+std = []
+
 [dependencies.serde]
 version = "1.0"
 optional = true
diff --git a/src/lib.rs b/src/lib.rs
index c44b04b..8eb14fc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -245,7 +245,7 @@ appropriate `repr` attribute:
 )]
 #![allow(unknown_lints)]
 #![warn(clippy::all)]
-#![no_std]
+#![cfg_attr(not(feature = "std"), no_std)]
 
 use core::fmt::{Debug, Formatter, Result};
 use core::ops::*;
@@ -276,6 +276,9 @@ impl core::fmt::Display for InvalidBits {
     }
 }
 
+#[cfg(feature = "std")]
+impl std::error::Error for InvalidBits {}
+
 #[doc(hidden)]
 pub trait Flags:
     Copy

From 419c3d198b87a32ef6d8f5f8c9ed48a871c2170a Mon Sep 17 00:00:00 2001
From: DerZade <DerZade@gmail.com>
Date: Tue, 5 Sep 2023 20:56:32 +0200
Subject: [PATCH 2/2] chore: use doc_auto_cfg feature for docs.rs builds

---
 Cargo.toml | 1 +
 src/lib.rs | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index 2aef39f..d644ebc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,3 +29,4 @@ version = "0.1"
 
 [package.metadata.docs.rs]
 all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
diff --git a/src/lib.rs b/src/lib.rs
index 8eb14fc..273f238 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -246,6 +246,7 @@ appropriate `repr` attribute:
 #![allow(unknown_lints)]
 #![warn(clippy::all)]
 #![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 use core::fmt::{Debug, Formatter, Result};
 use core::ops::*;