swift fast enumeration on MDLAsset not working

Question

I load an MDLAsset from my main bundle and get an compile error when fast iterating the asset object.

Type 'MDLAsset' does not conform to protocol 'SequenceType'

Documentation says it does support fast enumeration:

https://developer.apple.com/library/prerelease/ios/documentation/ModelIO/Reference/MDLAsset_Class/

Iterating over the asset is rather simple

for obj in asset {
    ...
}

I am using XCode7.1.1 and Swift2, is there something broken or what is it I am doing wrong?