Hi Kenton, I got into a pickle trying to convert a reader into a builder in 
C++. The relevant code looks like this:

```
PyObject* Network::_readPyRegion(const std::string& moduleName,
                                 const std::string& className,
                                 RegionProto::Reader& proto)
{
  capnp::AnyPointer::Reader implProto = proto.getRegionImpl();

  PyRegionProto::Reader pyRegionImplProto = 
implProto.getAs<PyRegionProto>();

  // See PyRegion::read implementation for reference

  capnp::MallocMessageBuilder builder;
  builder.setRoot(pyRegionImplProto.getRoot<PyRegionProto>()); // copy
```

The last line chokes during compilation: "*error: **no member named 
'getRoot' in 'PyRegionProto::Reader*"

Thank you,
Vitaly

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