TH breaking syntax highlight

[chiroptical]

This appears to break the syntax highlighting,

disambiguate <- lift $ examineSplice [||b||]

[chiroptical]

haskell-vim/syntax/haskell.vim

Line 116 in f35d022

syn region haskellTHDoubleBlock matchgroup=haskellTH start="\[||" end="||]" contains=TOP

This looks like it should support this syntax though.