# aes evaluation fails with unknown input
Unknown input: <environment>
---
Unknown input: <environment>
# aes() supports `!!!` in named arguments (#2675)
formal argument "y" matched by multiple actual arguments
# alternative_aes_extract_usage() can inspect the call
Don't know how to get alternative usage for `foo`
# new_aes() checks its inputs
`x` must be a list
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