Getting rid of syntex

json/Cargo.toml

@@ -14,7 +14,6 @@ clippy = { version = "0.0.82", optional = true}
 
 [build-dependencies]
 serde_codegen = { version = "0.7.0", optional = true }
-syntex = "*"
 
 [features]
 default = ["serde_codegen"]

json/build.rs

@@ -16,7 +16,6 @@
 
 #[cfg(not(feature = "serde_macros"))]
 mod inner {
-    extern crate syntex;
     extern crate serde_codegen;
 
     use std::env;
@@ -28,10 +27,7 @@ mod inner {
         let src = Path::new("src/lib.rs.in");
         let dst = Path::new(&out_dir).join("lib.rs");
 
-        let mut registry = syntex::Registry::new();
-
-        serde_codegen::register(&mut registry);
-        registry.expand("", &src, &dst).unwrap();
+        serde_codegen::expand(&src, &dst).unwrap();
     }
 }