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For example, the mock generator should still operate on a file like this: ``` package example import ( nonexistent "fake.com/this/package/doesnt/exist" ) type Fooer interface { SayHello(audience string) string } func...

See https://github.com/golang/mock/pull/420 for an example of how one can avoid using `packages.Load` in mock generation. This increases performance. Full disclosure: this would also be useful for creating a Bazel wrapper...

Allow exhaustiveness checks on structs

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Inspired from #35. There are certain structs whose fields you'd want to initialize exhaustively, i.e. whose fields should all be explicitly populated, even if with zero values. Being able to...