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This fixes #16860 by verifying that the generated sources don't already exist before asserting that the `alex` executable was found. This replicates the logic already used for `happy` in the case of `alex`.
144abba3
This fixes #16860 by verifying that the generated sources don't already exist before asserting that the `alex` executable was found. This replicates the logic already used for `happy` in the case of `alex`.