> Having a language feature to fetch dependencies from mutable online sources means that you're practically asking for programs to break unpredictably based on

> Having a language feature to fetch dependencies from mutable online sources means that you're practically asking for programs to break unpredictably based on external changes. Go devs always said that Go is designed to solve Google problems in Googley ways. All Google code builds from HEAD, at least it did when I was last there. The reasoning for this is that breaking changes can be discovered ASAP, instead of depending on code several versions back that might be much more painful to upgrade should the need arise. This is another case of the Google way having a sane reasoning, but perhaps does not work in other cases. I'd personally prefer some versioning system, but I can see why they've done it the way they did.