ECMA-334: 12.3.2 Initially unassigned variables

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12.3.2 Initially unassigned variables

The following categories of variables are classified as initially unassigned:

• Instance variables of initially unassigned struct variables.

• Output parameters, including the this variable of struct instance constructors without a constructor initializer.

• Local variables, except those declared in a catch clause, a foreach statement, or a using statement.