Bad parsing of string function

[romulusFR]

Query using string functions like CONCAT or UCASE in SELECT clause are badly parsed, with error '{' expected. e.g.

prefix foaf: <http://xmlns.com/foaf/0.1/>

SELECT DISTINCT ?s CONCAT(?lastname, " " , ?firstname)
WHERE {
  ?s a foaf:Person .
  ?s foaf:familyName ?lastname.
  ?s foaf:firstName ?firstname.
}