objc: Implement tracing for ObjCInterface

Follows all the method signatures

2 files changed, 16 insertions, 2 deletions

diff --git a/src/ir/objc.rs b/src/ir/objc.rs
index 963c8e20..5c721243 100644
--- a/src/ir/objc.rs
+++ b/src/ir/objc.rs
@@ -2,6 +2,7 @@
 
 use super::context::BindgenContext;
 use super::function::FunctionSig;
+use super::traversal::{Trace, Tracer};
 use clang;
 use clang_sys::CXChildVisit_Continue;
 use clang_sys::CXCursor_ObjCCategoryDecl;
@@ -168,3 +169,16 @@ impl ObjCInstanceMethod {
             .join("")
     }
 }
+
+impl Trace for ObjCInterface {
+    type Extra = ();
+
+    fn trace<T>(&self, context: &BindgenContext, tracer: &mut T, _: &())
+        where T: Tracer,
+    {
+        for method in &self.methods
+        {
+            method.signature.trace(context, tracer, &());
+        }
+    }
+}
diff --git a/src/ir/ty.rs b/src/ir/ty.rs
index 46083881..51652000 100644
--- a/src/ir/ty.rs
+++ b/src/ir/ty.rs
@@ -1326,8 +1326,8 @@ impl Trace for Type {
                 tracer.visit(id);
             }
 
-            TypeKind::ObjCInterface(_) => {
-                // TODO:
+            TypeKind::ObjCInterface(ref interface) => {
+                interface.trace(context, tracer, &());
             }
 
             // None of these variants have edges to other items and types.