error BC30201: Expression expected

[shaoht]

Hi I build the binaries base on the commit.
Then I use it to run a xaml file(The file is generated by WF Designer in the .NET Framework), it encounter a compiler error(error BC30201: Expression expected).
I think the reason is the xaml file include a attribute ExtentInput="[]", the type of ExtentInput is InArgument<CustomClass>.
Picture 1 is a activity which in xaml file.

Picture 2 is the exception.