Use data-default

[anton-k]

There is a standard class Data.Default (data-default on Hackage) for values with defaults. Maybe it is better to use it in place of defaultParserState and defaultWriterOptions then code will look like:

options :: WriterOptions
options = def { writerStandalone = True }

But it probably breaks a lot of code.

[ip1981]

Hi from 2018. Data.Default is toxic, def reduces readability.