c(x = 2)

c(x =
    2)

c(
  x = 2)

c(x
  = 2)

c(x = 2, a
  =
    1)


c(x = 2, a
  = # stuff
    1)


c(b=4, x # comment
  = 2)


c(x =# comment
  2, c=)