https://github.com/unicode-org/message-format-wg/blob/80bec5215a1a3fe10abdbd75a9489f9f42d470d7/test/tests/data-model-errors.json#L17 https://github.com/unicode-org/message-format-wg/blob/80bec5215a1a3fe10abdbd75a9489f9f42d470d7/test/tests/data-model-errors.json#L41 Both tests want some data-model error (`variant-key-mismatch`, `missing-fallback-variant`), but there is an unexpected `input` where an `.input` was needed.