reject negatives

Author: BobTheBuidler

mypyc/irbuild/expression.py

@@ -592,7 +592,7 @@ def transform_index_expr(builder: IRBuilder, expr: IndexExpr) -> Value:
 
     if isinstance(base.type, RTuple) and isinstance(
         folded_index := constant_fold_expr(builder, index), int
-    ):
+    ) and folded_index >= 0:
         return builder.add(TupleGet(base, folded_index, expr.line))
 
     if isinstance(index, SliceExpr):