foo :: Boom -> Int
foo Boom{..} = 10

bar0 :: Boom -> Int
bar0 Boom{boom} = boom

bar1 :: Boom -> Int
bar1 Boom{boom = b} = b

baz :: Boom -> Int
baz Boom{boom = b, ..} = b

quux :: Boom -> Int
quux
    Boom
        { boom = a
        , foom = b
        , ..
        } = a + b