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-rw-r--r--src/core_util.sml2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/core_util.sml b/src/core_util.sml
index 2a690736..2450562f 100644
--- a/src/core_util.sml
+++ b/src/core_util.sml
@@ -492,7 +492,7 @@ fun mapfoldB {kind = fk, con = fc, exp = fe, bind} =
fn t' =>
S.bind2 (mfe ctx e1,
fn e1' =>
- S.map2 (mfe ctx e2,
+ S.map2 (mfe (bind (ctx, RelE (x, t'))) e2,
fn e2' =>
(ELet (x, t', e1', e2'), loc))))