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from ghc-9.2 on, the “default” langauge of GHC is expected to change
more wildly. To prepare for that (and unblock
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/4853), this sets the
language for all the test files to `Haskell2010`. This should insolate
this test suite against changes to the default.
Cherry-picked from https://github.com/haskell/haddock/pull/1341
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This means that `html-test`, `latex-test`, `hoogle-test`, and
`hypsrc-test` now only depend on GHC boot libs. So we should
now be able to build and run these as part of GHC's testsuite. \o/
The reference output has changed very slightly, in three ways:
  * we don't convert quotes back into `"` as the `xml` lib did
  * we don't add extra ` ` as the `xml` lib did
  * we now remove the entire footer `div` (instead of just emptying it)
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* Amend `ParserSpec` to match new Hyperlinker API
    - pass in compiler info
    - strip out null tokens
* Make `hypsrc-test` pass reliably
    - strip out `local-*` ids
    - strip out `line-*` ids from the `ClangCppBug` test
    - re-accept output
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# Summary
This is a large architectural change to the Hyperlinker.
  * extract link (and now also type) information from `.hie` instead
    of doing ad-hoc SYB traversals of the `RenamedSource`. Also
    adds a superb type-on-hover feature (#715).
 * re-engineer the lexer to avoid needless string conversions. By going
    directly through GHC's `P` monad and taking bytestring slices, we
    avoid a ton of allocation and have better handling of position
    pragmas and CPP.
In terms of performance, the Haddock side of things has gotten _much_
more efficient. Unfortunately, much of this is cancelled out by the
increased GHC workload for generating `.hie` files. For the full set of
boot libs (including `ghc`-the-library)
  * the sum of total time went down by 9-10% overall
  * the sum of total allocations went down by 6-7%
# Motivation
Haddock is moving towards working entirely over `.hi` and `.hie` files.
This change means we no longer need the `RenamedSource` from
`TypecheckedModule` (something which is _not_ in `.hi` files).
# Details
Along the way a bunch of things were fixed:
 * Cross package (and other) links are now more reliable (#496)
 * The lexer tries to recover from errors on every line (instead of at CPP
    boundaries)
 * `LINE`/`COLUMN` pragmas are taken into account
 * filter out zero length tokens before rendering
 * avoid recomputing the `ModuleName`-based `SrcMap`
 * remove the last use of `Documentation.Haddock.Utf8` (see  #998)
 * restructure temporary folder logic for `.hi`/`.hie` model
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And fix impredicative Polymorphism testcase.
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