Fix rustc_lib srcs glob and allow it to be empty. #323
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My team uses the
build --incompatible_disallow_empty_glob
flag in our .bazelrc. When usingrust_repositories(version = "nightly", iso_date = "2020-05-15")
in our BUILD file, the build fails with the error:This glob is part of the rustc_lib filegroup. This PR adds allow_empty to that glob, similar to the change made in #245.