travis crashed with getters:

in src/compiler/crystal/tools/expand.cr:122: undefined method 'expansions=' for Crystal::ExpandResult
        res.expansions = @found_nodes.map { |node| ExpandResult::Expansion.build(node) }

Just use getters where no setters are needed. You don't have to wait for travis if you run the specs locally.

i don't know how it used and where, with mapping it all was as property.

Well, it's just six ivars and you already know one needs a setter. Just trial and error will get you through very quickly.

But what's the problem? They were properties before. I'd say that can be "fixed" in another PR...

Next we should remove mapping.