youngoli opened a new issue, #21789:
URL: https://github.com/apache/beam/issues/21789
### What happened?
Using `register.Function` (and presumable any other registration function)
on an anonymous struct causes a panic immediately. This happens because
anonymous types are unregisterable, but the problem is that with generic
registration, types are registered from these function signatures, which means
any functions with anonymous parameters can't be registered at all, and
therefore any types that only appear in the function signature are in effect
unregisterable.
The preference here would be for unregisterable parameters to simply be
skipped, and for registration to fail gracefully. That is, register everything
that can be registered and skip everything that can't (ideally with warnings
explaining what isn't being registered).
Example abbreviated stacktrace:
```
panic: invalid registration type: struct { Counter *int64
"beam:\"counter\""; Rand_data *struct { Flip *bool "beam:\"flip\""; Num *int64
"beam:\"num\""; Word *string "beam:\"word\"" } "beam:\"rand_data\"" }
goroutine 1 [running]:
github.com/apache/beam/sdks/v2/go/pkg/beam/core/runtime.RegisterType({0x118ecb8?,
0xe7df60?})
{...}/beam/sdks/go/pkg/beam/core/runtime/types.go:39 +0x24e
github.com/apache/beam/sdks/v2/go/pkg/beam/register.registerMethodTypes({0x118ecb8,
0xda8280})
{...}/beam/sdks/go/pkg/beam/register/register.go:8487 +0xba
github.com/apache/beam/sdks/v2/go/pkg/beam/register.Function1x1[...](0x104db10?)
{...}/beam/sdks/go/pkg/beam/register/register.go:3258 +0xc5
```
### Issue Priority
Priority: 2
### Issue Component
Component: sdk-go
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