Quote: multiple derivation is rejected for exceptions; ambiguous handlers; should handle both exceptions

Quotation Skeleton

An important design question is whether to allow … which is similar to multiple inheritance of classes … [e.g., exception network-file-err is derived from exceptions network-err and file-err] … While this looks reasonable, there are subtle problems … If network-file-err is raised, neither of the handlers … [for network-err and file-err] … [and which one should get the exception?] … If a handler clause has a handler only … … . If an exception cannot be caught by … as it introduces significant complications into the semantics. …   Google-1   Google-2

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