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diff --git a/tests/lean/External/Opaque.lean b/tests/lean/External/Opaque.lean
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+-- THIS FILE WAS AUTOMATICALLY GENERATED BY AENEAS
+-- [external]: opaque function definitions
+import Base
+import External.Types
+open Primitives
+
+namespace external
+
+structure OpaqueDefs where
+  
+  /- [core::mem::swap] -/
+  core.mem.swap_fwd (T : Type) : T → T → State → Result (State × Unit)
+  
+  /- [core::mem::swap] -/
+  core.mem.swap_back0
+    (T : Type) : T → T → State → State → Result (State × T)
+  
+  /- [core::mem::swap] -/
+  core.mem.swap_back1
+    (T : Type) : T → T → State → State → Result (State × T)
+  
+  /- [core::num::nonzero::NonZeroU32::{14}::new] -/
+  core.num.nonzero.NonZeroU32.new_fwd
+    :
+    U32 → State → Result (State × (Option
+      core_num_nonzero_non_zero_u32_t))
+  
+  /- [core::option::Option::{0}::unwrap] -/
+  core.option.Option.unwrap_fwd
+    (T : Type) : Option T → State → Result (State × T)
+  
+end external