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# Union
---
```text
Union_class `alias Enum[.container; .transient]
Union[Union_class; TYPE.symbol; ...]
```
```text
u : Union[I64.a; I64.b; I64.c] $ (.c : 5) // defaults to Union[.container; ...]
# u {
.c { c ... }[c]
{ ... } // default
}
```
# Transient Unions
Can only be retuned from functions and operations. The inner value must be moved out
## Alias
```text
Result[ANY] `alias Union[.transient; ANY.value; Error.error]
Option[ANY] `alias Union[.transient; ANY.some; Void.none]
```
## Default Operation
When a transient union is assigned the first type specified is moved out.
If the type is not the first specified a result with an error is returned to the parent function
```text
z : x / y // Result[Int[...]]
z // is value if y is not zero
```
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