neosnippet.vim/neosnippets/haskell.snip

snippet      import
abbr         import qualified ... as ...
  import qualified ${1} as ${2}

snippet      importOnly
abbr         import ... (...)
  import ${1} (${2})

snippet      language
abbr         {-# LANGUAGE ... #-}
  {-# LANGUAGE ${1} #-}

# hard-tab is necessary
snippet      case
abbr         case ... of
	case ${1} of
		${2} -> ${0}

snippet      main
abbr         main = do
  main = do
    ${0}

snippet     class
options     head
  class ${1:Class} ${2:a} where
    ${3:function} :: ${4:Type}

snippet     instance
options     head
  instance ${1:Class} ${2:Type} where
    ${3:function} ${4:self} = ${0:TARGET}