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# Fn
---
```text
Fn_class `alias Enum[.partial; .complete; .iterator; .closure; .bound; .regex; .native]
Fn[Fn_class; RETURN_TYPE; ARGS; STATE; List]
```
## Transient Union Return
### \`return_value
### \`return_error
### \`return_some
### \`return_none
## Transient Union Return Chaining
# Iterating
## \`has_next
## Transient Union Yield
### \`yield_value
### \`yield_error
### \`yield_some
### \`yield_none
```text
fn : Fn[x] $ ( @ 1 .. x { `yield_some 2 * x } )
it : fn `sync 10
// invoking
@ it { `log v }[v] // Opton[Int[...]].v $ (.some : 2); Opton[Int[...]].v $ (.some : 4)
// same as above
@ `has_next it { `log `call_sync it }
```
# Calling
## \`call_async
```text
task : `call_async fn
value : `task_wait task
```
## \`call_sync
```text
fn `call_sync args // `task_wait fn `call_async args
```
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