func newStruct(p *Package, obj *types.TypeName) (Struct, error) {
sym := p.syms.symtype(obj.Type())
if sym == nil {
panic(fmt.Errorf("no such object [%s] in symbols table", obj.Id()))
}
sym.doc = p.getDoc("", obj)
s := Struct{
pkg: p,
sym: sym,
obj: obj,
}
return s, nil
}