When commenting out a `@GenerateNiceMocks` annotation with `//`, the `build_runner` still tries to process the annotation, causing unexpected errors.

[WaldsonFagundes]

// @GenerateNiceMocks([
// MockSpec(),
// ])

[TekExplorer]

duplicate of #755 (very similar account names too... bot?)

[davidmorgan]

Also not enough information to do anything with--what errors? I suggest closing both. (I'd be really surprised if there's a bug here: from the point of view of source_gen/build_runner there's no such thing as a comment, that's all the analyzer, and obviously it knows how to handle comments).