idl groups:
	group:a_t,overwrited from a_t
idl vars:
	var:a,type:int32_t
		func:array
			arg:0
	var:b,type:int32_t
	var:c,type:nonetype
idl error:
	error.def:2:array size -10 is invalid
	error.def:6:var 'b' already exists at error.def:5
	error.def:9:type 'nonetype' doesn't exist
	error.def:15:groups 'a_t' already exists at error.def:12
	error.def:20:syntax error, unexpected ID, expecting INTEGER or LITERAL_STRING before char:'a'