博客介绍了在控制转移到块中语句列表的第一条语句（若语句列表为空则到块的结束点）时，变量v的明确赋值状态与块、checked或unchecked语句之前变量v的明确赋值状态相同。
12.3.3.2 Block statements, checked, and unchecked statements
The definite assignment state of v on the control transfer to the first
statement of the statement list in the
block (or to the end point of the block, if the statement list is empty) is
the same as the definite assignment
statement of v before the block, checked, or unchecked statement.
The definite assignment state of v on the control transfer to the first
statement of the statement list in the
block (or to the end point of the block, if the statement list is empty) is
the same as the definite assignment
statement of v before the block, checked, or unchecked statement.
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