How to disable all warnings for one file only?

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To disable just this warning you need the following:

{-# OPTIONS -Wno-unused-matches #-}

To find the right warning your best bet is probably to look at 5.2. Warnings and sanity-checking — Glasgow Haskell Compiler 9.0.1 User's Guide or my short reference (which isn’t exhaustive) at Making the most out of DAML Compiler warnings.

Alternatively, if you just want to undo your -Wall there is -Wno-all. If you want to undo -Werror and go back to warnings instead there is -Wwarn.

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