Incorrect printing in coercion_module_alias_test.res

[cknitt]

When formatting jscomp/test/coercion_module_alias_test.res,

module M7: {
  module N': {
    let x: int
  }
} = (M6: {
  module N: {
    let x: int
  }
  module N' = N
})

is reprinted to

module M7: {
  module N': {
    let x: int
  }
} = M6: {
  module N: {
    let x: int
  }
  module N' = N
}

which does not parse.