fix: make `@[elab_as_elim]` require at least one discriminant #22638

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zstd 1.5.6 is already installed and up-to-date. To reinstall 1.5.6, run: brew reinstall zstd

gmp 6.3.0 is already installed and up-to-date. To reinstall 6.3.0, run: brew reinstall gmp

libuv 1.49.0 is already installed and up-to-date. To reinstall 1.49.0, run: brew reinstall libuv

Input 'save-always' has been deprecated with message: save-always does not work as intended and will be removed in a future release. A separate `actions/cache/restore` step should be used instead. See https://github.com/actions/cache/tree/main/save#always-save-cache for more details.