Fix TH pretty-printing of nested GADTs, issue #23937
This commit fixes `Language.Haskell.TH.Ppr.pprint` so that it correctly pretty-prints GADTs declarations contained within data family instances. Fixes #23937
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- libraries/template-haskell/Language/Haskell/TH/Ppr.hs 25 additions, 17 deletionslibraries/template-haskell/Language/Haskell/TH/Ppr.hs
- testsuite/tests/th/T23927.hs 11 additions, 0 deletionstestsuite/tests/th/T23927.hs
- testsuite/tests/th/T23927.stdout 7 additions, 0 deletionstestsuite/tests/th/T23927.stdout
- testsuite/tests/th/all.T 1 addition, 0 deletionstestsuite/tests/th/all.T
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