#test pattern unfold wrong format.
UNFOLD_PATTERN  2 [ 5 6 7 8 ] 
UNFOLD_PATTERN  [ 2  5 6 7 8 ]
UNFOLD_PATTERN  [ 2 [ 5 6 7 8
UNFOLD_PATTERN  [ 2 [ 5 6 7 8 ]
UNFOLD_PATTERN  [ 2 [ a b c d ] ]
UNFOLD_PATTERN  [ 2 [ 5 6 7 8 ]]
