From: Marc-André Lureau <marcandre.lureau@redhat.com>
Date: Tue, 26 Aug 2025 13:31:32 +0000 (+0400)
Subject: rust/qemu-api-macros: make derive(Object) friendly when missing parent
X-Git-Tag: v10.2.0-rc1~122^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96f2c80fed20790fec0b35b774af676d5068077b;p=thirdparty%2Fqemu.git

rust/qemu-api-macros: make derive(Object) friendly when missing parent

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Link: https://lore.kernel.org/r/20250826133132.4064478-5-marcandre.lureau@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/rust/qemu-api-macros/src/lib.rs b/rust/qemu-api-macros/src/lib.rs
index b525d89c09e..a6147418891 100644
--- a/rust/qemu-api-macros/src/lib.rs
+++ b/rust/qemu-api-macros/src/lib.rs
@@ -85,7 +85,15 @@ fn derive_object_or_error(input: DeriveInput) -> Result<proc_macro2::TokenStream
     is_c_repr(&input, "#[derive(Object)]")?;
 
     let name = &input.ident;
-    let parent = &get_fields(&input, "#[derive(Object)]")?[0].ident;
+    let parent = &get_fields(&input, "#[derive(Object)]")?
+        .get(0)
+        .ok_or_else(|| {
+            Error::new(
+                input.ident.span(),
+                "#[derive(Object)] requires a parent field",
+            )
+        })?
+        .ident;
 
     Ok(quote! {
         ::qemu_api::assert_field_type!(#name, #parent,