ngModules with spread operator: ERROR in Error encountered resolving symbol values statically

[ganySA]

I have upgraded to the latest cli beta 31 - i am using the spread operator in my ngModules
export const arr = (obj) => Object.keys(obj).map(key => obj[key]);

and as follows:

declarations: [
...arr(frontend),
...arr(backend),

and i am getting the same error as many:

ERROR in Error encountered resolving symbol values statically. Function calls are not supported. Consider replacing the function or lambda with a reference to an exported function

Is this something to do with AOT compilation - is there a solution?

[ganySA]

I think this could be addressed in #4688

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