Run Haddock's test suite in CI

Many changes in GHC affect Haddock's output, breaking its test suite.

Recent examples are 5387483 and 7cba71f.

If cases like these were caught during CI, they could be fixed immediately, avoiding follow-up cleanup work by the Haddock maintainer.

Trac metadata

Trac field	Value
Version	8.6.3
Type	Task
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Test Suite
Test case
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changed weight to 5

added Ttask Trac import testsuite labels

This should be pretty achievable. In particular, the html-test, latex-test, hypsrc-test, and hoogle-test testsuites don't have large dependencies. In fact, the only extra library we would need to build would be the very stable and small xml.

If someone with some experience hacking on GHC's testsuite could advise, I'd be happy to take this on.

closed

Fixed in 4a09d30b.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

added Pnormal label