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The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at UNION.
Declares a union of one or more data types. The fielddeclarations must be valid data definitions. Omit the ENDS name label on nested UNION definitions.
Syntax
name
UNION [[alignment]] [[, NONUNIQUE]]
fielddeclarations
[[name]] ENDS