/usr/share/vim/addons/UltiSnips/haskell.snippets is in vim-snippets 1.0.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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snippet if "if ... then ... else ..."
if ${1:condition}
then ${2:expression}
else ${3:expression}
endsnippet
snippet case "case ... of ..."
case ${1:expression} of
${2:pattern} -> ${3:expression}
${4:pattern} -> ${5:expression}
endsnippet
snippet :: "Type signature"
${1:name} :: ${2:Type} -> ${3:Type}
endsnippet
snippet => "Type constraint"
(${1:Class} ${2:Type var}) => ${3:$2}
endsnippet
snippet def "Function definition"
${1:name} :: ${2:Type} -> ${3:Type}
endsnippet
snippet def[] "Function definition for list patterns"
${1:name} :: [${2:Type}] -> ${3:Type}
$1 [] = ${4:undefined}
$1 ${5:(x:xs)} = ${6:undefined}
endsnippet
snippet = "Function clause"
${1:name} ${2:pattern} = ${3:undefined}
endsnippet
snippet 2= "Function clause"
${1:name} ${2:pattern} = ${3:undefined}
$1 ${4:pattern} = ${5:undefined}
endsnippet
snippet 3= "Function clause"
${1:name} ${2:pattern} = ${3:undefined}
$1 ${4:pattern} = ${5:undefined}
$1 ${6:pattern} = ${7:undefined}
endsnippet
snippet | "Guard"
| ${1:predicate} = ${2:undefined}
endsnippet
snippet \ "Lambda expression"
\ ${1:pattern} -> ${2:expression}
endsnippet
snippet [|] "List comprehension"
[${3:foo }$1 | ${1:x} <- ${2:xs} ]
endsnippet
snippet let "let ... in ..."
let ${1:name} = ${2:expression}
in ${3:expression}
endsnippet
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