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-rw-r--r--src/theory/arith/tableau.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/theory/arith/tableau.h b/src/theory/arith/tableau.h
index 2ab94c195..7237c3a54 100644
--- a/src/theory/arith/tableau.h
+++ b/src/theory/arith/tableau.h
@@ -94,7 +94,7 @@ public:
void subsitute(Row& row_s){
TNode x_s = row_s.basicVar();
- Assert(!has(x_s));
+ Assert(has(x_s));
Assert(x_s != d_x_i);
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