Github user jbapple-cloudera commented on the issue:
https://github.com/apache/thrift/pull/1222
How about
```
void t_json_generator::write_type_spec(t_type* ttype) {
ttype = ttype->get_true_type();
write_string(get_type_name(ttype));
if (ttype->is_struct() || ttype->is_xception()) {
write_key_and_string("class", get_qualified_name(ttype));
return;
}
if (ttype->is_map()) {
t_type* ktype = ((t_map*)ttype)->get_key_type();
t_type* vtype = ((t_map*)ttype)->get_val_type();
write_key_and_string("keyTypeId", get_type_name(ktype));
write_key_and_string("valueTypeId", get_type_name(vtype));
write_type_spec_object("keyType", ktype);
write_type_spec_object("valueType", vtype);
return;
}
t_type* etype = NULL;
if (ttype->is_list()) {
etype = ((t_list*)ttype)->get_elem_type();
} else if (ttype->is_set()) {
etype = ((t_set*)ttype)->get_elem_type();
}
if( etype != NULL) {
write_key_and_string("elemTypeId", get_type_name(etype));
write_type_spec_object("elemType", etype);
}
}
```
Another alternative is to do what your other patch is doing and have
`t_set` and `t_list` inherit from a base type that has a `get_elem_type()`
virtual method.
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