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# ggplot() throws informative errors
`mapping` must be created with `aes()`.
x You've supplied a character vector.
---
`data` cannot be a function.
i Have you misspelled the `data` argument in `ggplot()`
# construction have user friendly errors
Cannot use `+` with a single argument.
i Did you accidentally put `+` on a new line?
---
Cannot add <ggproto> objects together.
i Did you forget to add this object to a <ggplot> object?
---
Can't add `1` to a <ggplot> object.
---
Can't add `geom_point` to a <ggplot> object
i Did you forget to add parentheses, as in `geom_point()`?
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