> stop_missing_aes("my_layer", "ip")
Error: `my_layer()` must have the following aesthetics: `ip`.

> stop_missing_aes("my_layer", c("x", "y"))
Error: `my_layer()` must have the following aesthetics: `x` and `y`.

> stop_missing_aes("my_layer", c("x", "y", "ip"))
Error: `my_layer()` must have the following aesthetics: `x`, `y` and `ip`.

