---input---
import ./foo.nix

map (x: x + x) [ 1 2 3 ]

---tokens---
'import'      Name.Builtin
' '           Text
'./foo.nix'   Literal
'\n\n'        Text

'map'         Name.Builtin
' '           Text
'('           Punctuation
'x'           Text
':'           Punctuation
' '           Text
'x'           Text
' '           Text
'+'           Operator
' '           Text
'x'           Text
')'           Punctuation
' '           Text
'['           Punctuation
' '           Text
'1'           Literal.Number.Integer
' '           Text
'2'           Literal.Number.Integer
' '           Text
'3'           Literal.Number.Integer
' '           Text
']'           Punctuation
'\n'          Text