Which plugin is removing blank spaces at the end of lines when writing?

[capn-freako]

I'd like to disable the automatic removal of blank space at the ends of lines in my Haskell code, so I can better control the resultant formatting of the Haddock generated documentation (by forcing line breaks, using two blank spaces at the end of a line).

Does anyone know which plugin is responsible for removing blank space at the end of lines when writing out the file?

[jship]

It is from a utility function defined in .vimrc:

https://github.com/begriffs/haskell-vim-now/blob/f55a7204db8ead19b927ab09056f384af9962537/.vimrc#L421-L426