Fix potential use-after-move bug.
Fix potential use-after-move bug.

Closes #38.

mavam/vast,pmos69/vast,vast-io/vast,mavam/vast,vast-io/vast,pmos69/vast,vast-io/vast,vast-io/vast,mavam/vast,mavam/vast,pmos69/vast,vast-io/vast,pmos69/vast