Problem with table

[maozhitao]

#cas
tabletest()
begin
d:=table("a"=1,"b"=2)
a:="a"
print(a+"="+d["a"]) //display a=1
print(a+"="+d[a]) //display a=0，I wish it's "a＝0".
end;

[roadrunner]

Table is not listed in the prime catalog, perhaps it's not fully implemented yet. It works as expected in xcas.