DescriptionAdd SpanException and SpanFormatException classes to source_maps.
It's often useful to associate source range information with an
exception in a way that will get printed along with that exception but
can be pulled out and manipulated directly. It's especially useful if
there's a common superclass/interface for doing so that can be shared
across packages. This adds that superclass.
R=sigmund@google.com
Committed: https://code.google.com/p/dart/source/detail?r=37509
Patch Set 1 #
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