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-rw-r--r--backends/lean/Base/Primitives/Base.lean4
1 files changed, 3 insertions, 1 deletions
diff --git a/backends/lean/Base/Primitives/Base.lean b/backends/lean/Base/Primitives/Base.lean
index 0b9d9c39..0c64eca1 100644
--- a/backends/lean/Base/Primitives/Base.lean
+++ b/backends/lean/Base/Primitives/Base.lean
@@ -69,7 +69,9 @@ def div? {α: Type u} (r: Result α): Bool :=
def massert (b:Bool) : Result Unit :=
if b then ret () else fail assertionFailure
-def eval_global {α: Type u} (x: Result α) (_: ret? x := by decide): α :=
+macro "prove_eval_global" : tactic => `(tactic| first | apply Eq.refl | decide)
+
+def eval_global {α: Type u} (x: Result α) (_: ret? x := by prove_eval_global) : α :=
match x with
| fail _ | div => by contradiction
| ret x => x