Program at 1:0
+-- sourceType: script
+-- body:
|   +-- 0: ExpressionStatement at 1:0
|   |   +-- expression: SequenceExpression at 1:0
|   |   |   +-- expressions:
|   |   |   |   +-- 0: UpdateExpression at 1:0
|   |   |   |   |   +-- operator: ++
|   |   |   |   |   +-- argument: Identifier at 1:2
|   |   |   |   |   |   +-- name: a
|   |   |   |   |   +-- prefix: True
|   +-- 1: ExpressionStatement at 1:5
|   |   +-- expression: SequenceExpression at 1:5
|   |   |   +-- expressions:
|   |   |   |   +-- 0: UpdateExpression at 1:5
|   |   |   |   |   +-- operator: ++
|   |   |   |   |   +-- argument: Identifier at 1:5
|   |   |   |   |   |   +-- name: b
|   |   |   |   |   +-- prefix: False
|   +-- 2: ExpressionStatement at 2:0
|   |   +-- expression: SequenceExpression at 2:0
|   |   |   +-- expressions:
|   |   |   |   +-- 0: UpdateExpression at 2:0
|   |   |   |   |   +-- operator: --
|   |   |   |   |   +-- argument: Identifier at 2:0
|   |   |   |   |   |   +-- name: a
|   |   |   |   |   +-- prefix: False
|   |   |   |   +-- 1: UpdateExpression at 2:5
|   |   |   |   |   +-- operator: --
|   |   |   |   |   +-- argument: Identifier at 2:7
|   |   |   |   |   |   +-- name: b
|   |   |   |   |   +-- prefix: True