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-rw-r--r--tests/ui/layout/debug.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/ui/layout/debug.rs b/tests/ui/layout/debug.rs
index b87a1d2031d..90e3c58dad7 100644
--- a/tests/ui/layout/debug.rs
+++ b/tests/ui/layout/debug.rs
@@ -18,6 +18,7 @@ type Test = Result<i32, i32>; //~ ERROR: layout_of
 
 #[rustc_layout(debug)]
 type T = impl std::fmt::Debug; //~ ERROR: layout_of
+#[define_opaque(T)]
 fn f() -> T {
     0i32
 }