hdl.ast: fix Slice validation.

Fixes #810.
2023-06-07 14:09:19 +02:00 · 2023-06-07 14:09:19 +02:00 · 3180a17fd9
commit 3180a17fd9
parent c7984463c7
2 changed files with 5 additions and 2 deletions
--- a/tests/test_hdl_ast.py
+++ b/tests/test_hdl_ast.py
@ -714,6 +714,9 @@ class SliceTestCase(FHDLTestCase):
        with self.assertRaisesRegex(IndexError,
                r"^Slice start 4 must be less than slice stop 2$"):
            Slice(c, 4, 2)
+        with self.assertRaisesRegex(IndexError,
+                r"^Cannot start slice -9 bits into 8-bit value$"):
+            Slice(c, -9, -5)

    def test_repr(self):
        s1 = Const(10)[2]