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Ryan Scott authored
Trac #10796 exposes a way to make `template-haskell`'s `dataToQa` function freak out if using a `Data` instance that produces a `Constr` (by means of `toConstr`) using a function name instead of a data constructor name. While such `Data` instances are somewhat questionable, they are nevertheless present in popular libraries (e.g., `containers`), so we can at least make `dataToQa` aware of their existence. In order to properly distinguish strings which represent variables (as opposed to data constructors), it was necessary to move functionality from `Lexeme` (in `ghc`) to `GHC.Lexeme` in a new `ghc-boot` library (which was previously named `bin-package-db`). Reviewed By: goldfire, thomie Differential Revision: https://phabricator.haskell.org/D1313 GHC Trac Issues: #10796
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