Discriminant for which kind of initializer
Copy the AST for Initializer.
_init.d Documentation: https://dlang.org/phobos/dmd_init.html Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/init.d
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Defines initializers of variables, e.g. the array literal in int[3] x = [0, 1, 2].