Disabled broken Clone impl for unsized buffers

vulkano-shaders/src/structs.rs

@@ -174,15 +174,20 @@ fn write_struct(doc: &parse::Spirv, struct_id: u32, members: &[u32]) -> String {
             });
         }
     }
+    
+    // We can only implement Clone if there's no unsized member in the struct.
+    let impl_text = if current_rust_offset.is_some() {
+        format!("\nimpl Clone for {name} {{\n    fn clone(&self) -> Self {{\n        \
+                 {name} {{\n{copies}\n        }}\n    }}\n}}\n", name = name,
+                 copies = rust_members.iter().map(Member::copy_text).collect::<Vec<_>>().join(",\n"))
+    } else {
+        "".to_owned()
+    };
 
-    format!("#[repr(C)]\n\
-             pub struct {name} {{\n{members}\n}} /* total_size: {t:?} */\n\n\
-             impl Clone for {name} {{\n    fn clone(&self) -> Self {{\n        \
-             {name} {{\n{copies}\n        }}\n    }}\n}}\n\n",
+    format!("#[repr(C)]\npub struct {name} {{\n{members}\n}} /* total_size: {t:?} */\n{impl_text}",
             name = name,
             members = rust_members.iter().map(Member::declaration_text).collect::<Vec<_>>().join(",\n"),
-            t = spirv_req_total_size,
-            copies = rust_members.iter().map(Member::copy_text).collect::<Vec<_>>().join(",\n"))
+            t = spirv_req_total_size, impl_text=impl_text)
 }
 
 /// Returns true if a `BuiltIn` decorator is applied on a struct member.