8357eeb762
* in some cases more specific sg exception types were used in place of the more generic one, e.g., sg_io_exception instead of sg_exception when the context of the error was an IO error * in some cases, the error message was made more specific * minor style fix for exception rethrowing --- using throw; whenever a re-throw is made; sometimes optimizing away the exception symbol name in the catch handler at all * more specific catch handlers added in some places -- e.g., an sg_io_exception caught ahead of sg_exception
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