Use fail instead of error #2
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`error` in Template Haskell splices should be used to report bugs in the Template Haskell code, and ideally not to report bugs in the user code calling it. When GHC encounters `error`, it gives a rather more verbose (and ugly) error report, based on that assumption. The usual way to report a problem in this context is to use `fail`.
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errorin Template Haskell splices should be used to report bugs in the Template Haskell code, and ideally not to report bugs in the user code calling it. When GHC encounterserror, it gives a rather more verbose (and ugly) error report, based on that assumption. The usual way to report a problem in this context is to usefail.