Track Exceptions

Figure out for each function which exceptions can be thrown by it. This could probably be done by tracking calls to

throw

and

catch

and their types. The info would probably need to be stored in the .hi files, and could then be displayed by haddock.

Trac metadata

Trac field	Value
Version
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
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Blocking
CC
Operating system
Architecture