fe: Produce an error in case of a declaration in a lazy expression, #1666 #1667
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Currently, features declared in an expression used as a lazy value will cause errors since the declaraions are resolved twice, once before and once after they were wrapped in the Lazy instance.
This patch is only a workaround that produces an error message, explains what to do alternatively and what needs to be improved in the Fuzion code to properly fix this.