Diagram Synthesis fails wih IllegalArgumentException when enabling "Reactor State Variables"

[cmnrd]

Steps to reproduce:

1. Create a program that contains state variables

target Cpp

main reactor Example {
    state foo: int = 42
}

2. Enable the "Reactor State Variables" option in VS code

[soerendomroes]

It seems to be a problem in the model.
Here something tries to infer the target of an InitializerImpl which is an EObject but not a Model.

[cmnrd]

Oh, right. This actually looks like a bug in FormattingUtil. @petervdonovan could you take a look at this? I assume that the diagram synthesis renders a string from a state variable to print in the diagram, but it fails because it cannot in infer the target.