'1'           Literal.Number.Integer
' '           Text
'::'          Operator
' '           Text
'2'           Literal.Number.Integer
' '           Text
'::'          Operator
' '           Text
'Nil'         Name.Class
'\n'          Text

'a'           Name
' '           Text
'++'          Operator
' '           Text
'b'           Name
'\n'          Text

'a'           Name
' '           Text
':+'          Operator
' '           Text
'b'           Name
'\n'          Text

'a'           Name
' '           Text
'+:'          Operator
' '           Text
'b'           Name
'\n'          Text

'a'           Name
' '           Text
':++'         Operator
' '           Text
'b'           Name
'\n'          Text

'a'           Name
' '           Text
'++:'         Operator
' '           Text
'b'           Name
'\n'          Text

'a'           Name
' '           Text
'+'           Operator
' '           Text
'b'           Name
'\n'          Text
