# E0299: abstract methods cannot be marked as a generator

`*` on a method allows using the `yield` keyword in the body of the method. Abstract class methods do not have bodies. Therefore, `*` does not make sense on abstract methods, and it is a syntax error to write it:

    abstract class RandomSource {
      abstract *makeRandomNumbers(): Generator<number>;
    }

To fix this error, remove the `*`:

    abstract class RandomSource {
      abstract makeRandomNumbers(): Generator<number>;
    }

Introduced in quick-lint-js version 2.10.0.

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