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# ext
Demonstrates how to use external types in an `avo` function signature.
In this case, you will need to write the function stub yourself.
[embedmd]:# (stub.go /package/ $)
```go
package ext
import "github.com/mmcloughlin/avo/examples/ext/ext"
// StructFieldB returns field B.
func StructFieldB(e ext.Struct) byte
```
Then in place of the usual `TEXT` declaration we use `Implement` to state that we are beginning the definition of a function already declared in the package stub file.
[embedmd]:# (asm.go go /.*Package.*/ /RET.*/)
```go
Package("github.com/mmcloughlin/avo/examples/ext")
Implement("StructFieldB")
b := Load(Param("e").Field("B"), GP8())
Store(b, ReturnIndex(0))
RET()
```
Finally, in this case the `go:generate` line is different since we do not need to generate the stub file.
[embedmd]:# (ext_test.go go /.*go:generate.*/)
```go
//go:generate go run asm.go -out ext.s
```
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