% cat foo.d
module foo;

private {
    int i;
    typedef int[int] MyAA;
}
% dmd -X -c foo.d
% cat -n foo.json
     1  {
     2  "name" : "foo",
     3  "kind" : "module",
     4  "file" : "foo.d",
     5  "members" : [
     6  {
     7  "name" : "i",
     8  "kind" : "variable",
     9  "type" : "int",
    10  "line" : 4}
    11  {
    12  "name" : "MyAA",
    13  "kind" : "typedef",
    14  "type" : "MyAA",
    15  "line" : 5,
    16  "base" : "int[int]"}
    17  ]
    18  }
%

There should be a comma between lines 10 and 11.