This means that the value of a local constant is undefined until the constantdeclaration statement is reached and that a local variable is undefined until the variable is assigned to in the function.
这就意味着在到达常数声明语句前局部常数值是未定义的,在函数中分配变量前局部变量是未定义的。
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Also as the name says, implicitly typed local variable, you cannot use var for field declaration or constant variables, therefore following declarations will both produce a compiler error.