w :: [a] -> a
x :: [a] -> a

<interactive>:1:1: error: [GHC-88464]
    Variable not in scope: y
    Suggested fix:
      Notice that ‘y’ is a field selector
      that has been suppressed by NoFieldSelectors.

<interactive>:1:1: error: [GHC-88464]
    Variable not in scope: z
    Suggested fix:
      Notice that ‘z’ is a field selector
      that has been suppressed by NoFieldSelectors.