make sure to build type params constraints when we build the class (close #3789)
make sure to build type params constraints when we build the class (close #3789)

pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe