A union type is a nominal, heterogeneous C-like union, denoted by the name of a
A union access transmutes the content of the union to the type of the accessed field. Since transmutes can cause unexpected or undefined behaviour,
unsafe is required to read from a union field or to write to a field that doesn't implement
The memory layout of a
union is undefined by default, but the
#[repr(...)] attribute can be used to fix a layout.
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