we don't need zero-sized freeze-sensitive visiting

diff --git a/src/helpers.rs b/src/helpers.rs
index f65eef557c967260fafc1c0b7dc6d6ca0425a7e8..16451fb8726a6fb49b26133f894b61b7d84f3995 100644 (file)
--- a/src/helpers.rs
+++ b/src/helpers.rs
@@ -58,6 +58,7 @@ fn visit_freeze_sensitive(
             .map(|(size, _)| size)
             .unwrap_or_else(|| place.layout.size)
         );
+        assert!(size.bytes() > 0);
         // Store how far we proceeded into the place so far. Everything to the left of
         // this offset has already been handled, in the sense that the frozen parts
         // have had `action` called on them.