Add negative index test for descriptor array

Author: hankluo6

integration_tests/CMakeLists.txt

@@ -435,6 +435,7 @@ RUN(NAME array_expr_06            LABELS cpython llvm c)
 RUN(NAME array_expr_07            LABELS cpython llvm c)
 RUN(NAME array_expr_08            LABELS cpython llvm c)
 RUN(NAME array_expr_09            LABELS cpython llvm c)
+RUN(NAME array_expr_10            LABELS cpython llvm c)
 RUN(NAME array_size_01            LABELS cpython llvm c)
 RUN(NAME array_size_02            LABELS cpython llvm c)
 RUN(NAME array_01            LABELS cpython llvm wasm c)

integration_tests/array_expr_10.py

@@ -0,0 +1,17 @@
+from lpython import i32
+from numpy import empty, int32, array
+
+def foo(x: i32[:]):
+    print(x[3], x[4], x[-1], x[-2])
+    assert x[-1] == 5
+    assert x[-2] == 4
+    assert x[-3] == 3
+    assert x[-4] == 2
+    assert x[-5] == 1
+
+def main():
+    x: i32[5] = empty(5, dtype=int32)
+    x = array([1, 2, 3, 4, 5])
+    foo(x)
+
+main()