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Add exception type to SomeException displayException; modify default handler

Tommy Bidne requested to merge tbidne/ghc:display-ex-type2 into master

This is an alternative to !11737.

The primary differences are:

  • Exception type data added to SomeException's displayException, rather than the handler.
  • Handler adding a header e.g. Exception in thread ....

This is discussed at: https://github.com/haskell/core-libraries-committee/issues/261.

If the CLC proposal is approved I will make the prerequisite MRs fix tests in other repos (e.g. stm).

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