1 files changed, 23 insertions, 0 deletions
diff --git a/third_party/rust/serde_derive/src/dummy.rs b/third_party/rust/serde_derive/src/dummy.rs
new file mode 100644
index 0000000000..095f950f3e
--- /dev/null
+++ b/third_party/rust/serde_derive/src/dummy.rs
@@ -0,0 +1,23 @@
+use proc_macro2::TokenStream;
+use quote::quote;
+
+pub fn wrap_in_const(serde_path: Option<&syn::Path>, code: TokenStream) -> TokenStream {
+    let use_serde = match serde_path {
+        Some(path) => quote! {
+            use #path as _serde;
+        },
+        None => quote! {
+            #[allow(unused_extern_crates, clippy::useless_attribute)]
+            extern crate serde as _serde;
+        },
+    };
+
+    quote! {
+        #[doc(hidden)]
+        #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
+        const _: () = {
+            #use_serde
+            #code
+        };
+    }
+}