8000 Python API: incorrect sort wrapper for "(seq.nth s i)" · Issue #2537 · Z3Prover/z3 · GitHub
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Python API: incorrect sort wrapper for "(seq.nth s i)" #2537

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corwin-of-amber opened this issue Sep 5, 2019 · 0 comments
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Python API: incorrect sort wrapper for "(seq.nth s i)" #2537

corwin-of-amber opened this issue Sep 5, 2019 · 0 comments

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@corwin-of-amber
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The Python expression Const('s', SeqSort(IntSort()))[0] generates the correct expression AST, but wraps it with a SeqRef, while its actual sort is IntSort() (in general, the sort of the Seq's elements).

The following patch fixes it.

diff --git a/src/api/python/z3/z3.py b/src/api/python/z3/z3.py
index 3a1f3d5fe..f8df8f003 100644
--- a/src/api/python/z3/z3.py
+++ b/src/api/python/z3/z3.py
@@ -9988,7 +9988,7 @@ class SeqRef(ExprRef):
     def __getitem__(self, i):
         if _is_int(i):
             i = IntVal(i, self.ctx)
-        return SeqRef(Z3_mk_seq_nth(self.ctx_ref(), self.as_ast(), i.as_ast()), self.ctx)
+        return _to_expr_ref(Z3_mk_seq_nth(self.ctx_ref(), self.as_ast(), i.as_ast()), self.ctx)
 
     def at(self, i):
         if _is_int(i):
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