From 45a870e9b5bc9fdb3f363cf54d5c7c3e47989635 Mon Sep 17 00:00:00 2001
From: Ryan Levick <ryan.levick@gmail.com>
Date: Thu, 19 Sep 2019 14:31:13 +0200
Subject: [PATCH] Fix recursive call

---
 macros/com_interface_attribute/src/com_interface_impl.rs | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/macros/com_interface_attribute/src/com_interface_impl.rs b/macros/com_interface_attribute/src/com_interface_impl.rs
index 1f5cf78..53fd6a0 100644
--- a/macros/com_interface_attribute/src/com_interface_impl.rs
+++ b/macros/com_interface_attribute/src/com_interface_impl.rs
@@ -10,15 +10,16 @@ pub fn generate(trait_item: &ItemTrait) -> HelperTokenStream {
     let vptr_ident = vptr::ident(&interface_ident.to_string());
     let iid_ident = iid::ident(interface_ident);
     let vtable_macro = vtable_macro::ident(&interface_ident);
+    let iid_check = quote! { com::_winapi::shared::guiddef::IsEqualGUID(riid, &Self::IID) };
     let recursive_iid_check = if let Some(TypeParamBound::Trait(t)) = trait_item.supertraits.first()
     {
         let supertrait_ident = t.path.get_ident().unwrap();
-        quote!(com::_winapi::shared::guiddef::IsEqualGUID(riid, &Self::IID) | #supertrait_ident::is_iid_in_inheritance_chain(riid))
+        quote! { #iid_check || <dyn #supertrait_ident as com::ComInterface>::is_iid_in_inheritance_chain(riid) }
     } else {
-        quote!(com::_winapi::shared::guiddef::IsEqualGUID(riid, &Self::IID))
+        iid_check
     };
 
-    quote!(
+    quote! {
         unsafe impl com::ComInterface for dyn #interface_ident {
             type VTable = #vtable_ident;
             type VPtr = #vptr_ident;
@@ -34,5 +35,5 @@ pub fn generate(trait_item: &ItemTrait) -> HelperTokenStream {
                 #vtable_macro!(C, O)
             }
         }
-    )
+    }
 }