a = b {c = "d"}

a = 
  b {c = "d"
    ,e = "f"}

longLines = 
  longLines {longLines = "word word word word"
            ,wordWordWordWord = "long lines long long long"}

a = B {c = "d"}

a = 
  B {c = "d"
    ,e = "f"}

longLines = 
  LongLines {longLines = "word word word word"
            ,wordWordWordWord = "long lines long long long"}