Fix doctests with --no-default-features

Author: kpcyrd

.github/workflows/rust.yml

@@ -44,6 +44,7 @@ jobs:
           - --all-features
           - --features=bigint,serialize,debug
           - --features=bigint,serialize,trace
+          - --no-default-features
     steps:
       - uses: actions/checkout@v4
       - name: Install stable toolchain

src/asn1_types/integer.rs

@@ -276,7 +276,8 @@ impl_int!(u128 => i128);
 ///
 /// Encoding an `Integer` to DER
 ///
-/// ```
+#[cfg_attr(feature = "std", doc = r#"```"#)]
+#[cfg_attr(not(feature = "std"), doc = r#"```rust,compile_fail"#)]
 /// use asn1_rs::{Integer, ToDer};
 ///
 /// let i = Integer::from(4);

src/asn1_types/sequence.rs

@@ -28,7 +28,8 @@ pub use sequence_of::*;
 /// - if the sequence is composed of objects of the same type, the [`Sequence::from_iter_to_der`] method can be used
 /// - otherwise, the [`ToDer`] trait can be used to create content incrementally
 ///
-/// ```
+#[cfg_attr(feature = "std", doc = r#"```"#)]
+#[cfg_attr(not(feature = "std"), doc = r#"```rust,compile_fail"#)]
 /// use asn1_rs::{Integer, Sequence, SerializeResult, ToDer};
 ///
 /// fn build_seq<'a>() -> SerializeResult<Sequence<'a>> {
@@ -48,7 +49,8 @@ pub use sequence_of::*;
 ///
 /// # Examples
 ///
-/// ```
+#[cfg_attr(feature = "std", doc = r#"```"#)]
+#[cfg_attr(not(feature = "std"), doc = r#"```rust,compile_fail"#)]
 /// use asn1_rs::{Error, Sequence};
 ///
 /// // build sequence

src/asn1_types/set.rs

@@ -29,7 +29,8 @@ pub use set_of::*;
 /// - if the set is composed of objects of the same type, the [`Set::from_iter_to_der`] method can be used
 /// - otherwise, the [`ToDer`] trait can be used to create content incrementally
 ///
-/// ```
+#[cfg_attr(feature = "std", doc = r#"```"#)]
+#[cfg_attr(not(feature = "std"), doc = r#"```rust,compile_fail"#)]
 /// use asn1_rs::{Integer, Set, SerializeResult, ToDer};
 ///
 /// fn build_set<'a>() -> SerializeResult<Set<'a>> {
@@ -49,7 +50,8 @@ pub use set_of::*;
 ///
 /// # Examples
 ///
-/// ```
+#[cfg_attr(feature = "std", doc = r#"```"#)]
+#[cfg_attr(not(feature = "std"), doc = r#"```rust,compile_fail"#)]
 /// use asn1_rs::{Error, Set};
 ///
 /// // build set

src/derive.rs

@@ -375,7 +375,8 @@ pub use asn1_rs_derive::ToStatic;
 ///
 /// Define a structure and add the `DerSequence` derive:
 ///
-/// ```rust
+#[cfg_attr(feature = "std", doc = r#"```rust"#)]
+#[cfg_attr(not(feature = "std"), doc = r#"```rust,compile_fail"#)]
 /// use asn1_rs::*;
 ///
 /// #[derive(DerSequence, ToDerSequence)]

src/doc/mod.rs

@@ -3,6 +3,7 @@
 #[doc = include_str!("../../doc/RECIPES.md")]
 pub mod recipes {}
 
+#[cfg(feature = "std")]
 #[doc = include_str!("../../doc/DERIVE.md")]
 pub mod derive {}
 

src/lib.rs

@@ -101,7 +101,8 @@
 //!
 //! Writing 2 BER integers:
 //!
-//! ```rust
+#![cfg_attr(feature = "std", doc = r#"```rust"#)]
+#![cfg_attr(not(feature = "std"), doc = r#"```rust,compile_fail"#)]
 //! use asn1_rs::{Integer, ToDer};
 //!
 //! let mut writer = Vec::new();
@@ -120,7 +121,8 @@
 //!
 //! Similarly to `FromBer`/`FromDer`, serialization methods are also implemented for primitive types:
 //!
-//! ```rust
+#![cfg_attr(feature = "std", doc = r#"```rust"#)]
+#![cfg_attr(not(feature = "std"), doc = r#"```rust,compile_fail"#)]
 //! use asn1_rs::ToDer;
 //!
 //! let mut writer = Vec::new();