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DRFUnused.hs:10:16: error: [-Wunused-top-binds (in -Wextra, -Wunused-binds), -Werror=unused-top-binds]
Defined but not used: ‘foo’
DRFUnused.hs:18:5: warning: [-Wambiguous-fields (in -Wdefault)]
The field ‘foo’ belonging to type U is ambiguous.
This will not be supported by -XDuplicateRecordFields in future releases of GHC.
You can use explicit case analysis to resolve the ambiguity.
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