On reindent, lines with "in" keyword are misaligned

[mganjoo]

When realigning a block such as the following using "="

loop acc x:xs = let acc' = acc * 10 + digitToIt x
                in loop acc xs

the in is re-aligned with the variable binding on the previous line, not the let.

[mganjoo]

I believe it's because of the line if thisl =~ '\s*in$ in indent/haskell.vim. It should probably be if thisl =~ '\s*in\> instead? I could send a pull request if needed.