String s = "" +
"mutable_set = {1,2,3,4,5}\n" +
"";
SimpleNode ast = parseLegalDocStr(s);
Module m = (Module) ast;
Assign assign = (Assign) m.body[0];
Set set = (Set) assign.value;
assertEquals(
"Set[elts=[Num[n=1, type=Int, num=1], Num[n=2, type=Int, num=2], Num[n=3, type=Int, num=3], Num[n=4, type=Int, num=4], Num[n=5, type=Int, num=5]]]",
set.toString());