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# Union
---
```text
Union_class `alias Enum[.container; .transient]
Union[Union_class; Collection[TYPE.SYMBOL]]
```
# Alias
```text
Tag[Collection[TYPE.SYMBOL]] `alias Union[.container; Collection[TYPE.SYMBOL]]
```
## Tag Example
```text
u : Tag[I64.a; I64.b; I64.c] $ (.c : 5)
# u {
.c {[c] c ... }
{ ... } // default
}
```
# Operators
## ``take`
# Transient Unions
Can only be retuned from functions and operations. The inner value must be moved out
## Alias
```text
Result[Generic.T] `alias Union[.transient; Generic.T.value; Error.error]
Option[Generic.T] `alias Union[.transient; Generic.T.some; Void.none]
Next[Generic.T] `alias Union[.transient; Generic.T.iter; Void.done]
Next_result[Generic.T] `alias Union[.transient; Generic.T.value; Error.error; Void.done]
Next_option[Generic.T] `alias Union[.transient; Generic.T.some; Void.none; Void.done]
```
## Default Operation
When a transient union is assigned the first type specified is moved out.
If no match is used and if the type is not the first specified a result with an error is returned
```text
z : x / y // Result[...]
z // is value if y is not zero
```
## Operators
### \`value
### \`error
### \`some
### \`none
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