Build documentation for Serde in docs.rs

Cargo.toml

@@ -15,6 +15,7 @@ edition = "2021"
 autocfg = "1"
 
 [dependencies]
+equivalent = "1.0.1"
 indexmap = {version = "2", features = [], default-features = false}
 serde = { version = "1", optional = true }
 
@@ -32,3 +33,7 @@ benchmarks = []
 
 [workspace]
 members = ["test-nostd"]
+
+[package.metadata.docs.rs]
+features = ["serde"]
+rustdoc-args = ["--cfg", "docsrs"]

src/double_priority_queue/mod.rs

@@ -999,6 +999,7 @@ fn better_to_rebuild(len1: usize, len2: usize) -> bool {
 }
 
 #[cfg(feature = "serde")]
+#[cfg_attr(docsrs, doc(cfg(feature = "serde")))]
 mod serde {
     use std::cmp::{Eq, Ord};
     use std::hash::{BuildHasher, Hash};

src/priority_queue/mod.rs

@@ -791,6 +791,7 @@ fn better_to_rebuild(len1: usize, len2: usize) -> bool {
 }
 
 #[cfg(feature = "serde")]
+#[cfg_attr(docsrs, doc(cfg(feature = "serde")))]
 mod serde {
     use std::cmp::{Eq, Ord};
     use std::hash::{BuildHasher, Hash};