diff --git a/src/bindgen/utilities.rs b/src/bindgen/utilities.rs
index 0e314b9a8..64cdfb995 100644
--- a/src/bindgen/utilities.rs
+++ b/src/bindgen/utilities.rs
@@ -100,6 +100,9 @@ fn is_skip_item_attr(attr: &syn::Meta) -> bool {
                 if let syn::Lit::Str(ref content) = name_value.lit {
                     // FIXME(emilio): Maybe should use the general annotation
                     // mechanism, but it seems overkill for this.
+                    if content.value().contains("XXX") {
+                        panic!("*** XXX *** {}", content.value());
+                    }
                     if content.value().trim() == "cbindgen:ignore" {
                         return true;
                     }
diff --git a/tests/rust/ignore.rs b/tests/rust/ignore.rs
index dd6b0b74f..21480a2d3 100644
--- a/tests/rust/ignore.rs
+++ b/tests/rust/ignore.rs
@@ -28,14 +28,14 @@ pub const NOT_IGNORED_CONST: u32 = 0;
 pub struct StructWithIgnoredImplMembers;
 
 impl StructWithIgnoredImplMembers {
-    /// cbindgen:ignore
+    /// XXX associated method cbindgen:ignore
     #[no_mangle]
     pub extern "C" fn ignored_associated_method() {}
 
     #[no_mangle]
     pub extern "C" fn no_ignore_associated_method() {}
 
-    /// cbindgen:ignore
+    /// XXX associated constant cbindgen:ignore
     pub const IGNORED_INNER_CONST: u32 = 0;
 
     pub const NOT_IGNORED_INNER_CONST: u32 = 0;