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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]
```
## \`return
## Transient Union Return Chaining
# Iterating
## \`yield
Yielding wraps the value in the transient union `Next`
Return `Void` to stop iteration
```text
fn : Fn[x] $ ( @ 1 .. x { `yield 2 * x } )
it : fn `sync 10
// invoking
@ it { `log v }[v] // 2 4 6 8 10 12 14 16 18 20
// same as above
@ {
# `sync it {
.value { `log v }[v]
.done { `break }
.error { `return e }[e]
}
}
```
# Calling
## \`async
```text
task : `async fn
value : `wait task
```
## \`sync
```text
fn `sync args // `wait fn `async args
```
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