break(slice): toNimSlice is no longer a cvt; cvt toPySlice from PySlice1

Author: litlighilit

src/pylib/builtins/pyslice.nim

@@ -28,7 +28,11 @@ func slice*(start, stop: int, step: int): PySlice =
 
 func slice*(stop: int): PySlice1 = slice(0, stop)
 
-converter toNimSlice*(s: PySlice1): Slice[int] =
+converter toPySlice*(s: PySlice1): PySlice =
+  result = PySlice(start: s.start, stop: s.stop, step: 1)
+
+proc toNimSlice*(s: PySlice1): Slice[int] =
+  assert result.a >= 0 and result.b >= 0
   result.b = s.stop - 1
   result.a = s.start