defer
* Add defer Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Convert to macro + review fixes Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Apply suggestions from code review Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com> * Move into new file and add panic unwind tests Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Fix doc and Clippy Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>