select nom features

Cargo.toml

@@ -7,7 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-nom = "6"
+nom = { version = "6", default_features = false, features = ["std"] }
 bstr = "0.2.15"
 
 [dependencies.serde_crate]

src/lib.rs

@@ -1,5 +1,9 @@
 #![forbid(unsafe_code)]
 
+// Cargo.toml cannot have self-referential dependencies, so you can't just
+// specify the actual serde crate when you define a feature called serde. We
+// instead call the serde crate as serde_crate and then rename the crate to
+// serde, to get around this in an intuitive manner.
 #[cfg(feature = "serde")]
 extern crate serde_crate as serde;