Confusing message when using wrong inject

[chriskrycho]

After upgrading to the new modules syntax, I had to revert one small section of my app (complicated story; mostly irrelevant), and in one module I missed converting inject() back to inject.service(). The error message reported is… extremely confusing:

"Assertion Failed: Injected properties must be created through helpers, see 'controller"service'"

I managed to figure it out based on the fact that I knew I'd messed with rewriting injections in those particular modules, but I can imagine that being especially confusing if you didn't. (Note that the codemod eliminates this problem by doing import { inject as service } from '@ember/service', so the error would be different—and clearer—in that case.

This error message should be much clearer.

[chriskrycho]

The implementation is here. Should be a simple fix. I'll push a PR for it either tonight or tomorrow.