博客介绍了Throw statements，对于throw expr;形式的语句，expr开始时变量v的明确赋值状态与stmt开始时变量v的明确赋值状态相同。
12.3.3.11 Throw statements
For a statement stmt of the form
throw expr ;
the definite assignment state of v at the beginning of expr is the same as
the definite assignment state of v at
the beginning of stmt.
For a statement stmt of the form
throw expr ;
the definite assignment state of v at the beginning of expr is the same as
the definite assignment state of v at
the beginning of stmt.
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