Definitions in structures (modules) are extended as follows:
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Toplevel definition in structure can of course be join-definition. The additional def exception exception constructs enables matching by structure in try … with …handlers. The construct, somehow aleviates the burden of having generative exceptions in a distributed context. The name exception must be the name of a pre-existing exception, and def exception exception must be executed at most once. See Section 2.3.2 for an example.