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# facet_grid() fails if passed both a formula and a vars()
`rows` must be `NULL` or a `vars()` list if `cols` is a `vars()` list.
# can't pass formulas to `cols`
`cols` must be a `vars()` specification or `NULL`, not a <formula> object.
# facet gives clear error if
Faceting variables can only appear in `rows` or `cols`, not both.
i Duplicated variables: "x"
---
`rows` must be `NULL` or a `vars()` list if `cols` is a `vars()` list.
i Did you use `%>%` or `|>` instead of `+`?
---
A grid facet specification can't have more than two dimensions.
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`cols` must be a `vars()` specification or `NULL`, not the string "free".
# at least one layer must contain all facet variables in combine_vars()
At least one layer must contain all faceting variables: `letter`
x Plot is missing `letter`
Layer is missing `letter`
# combine_vars() generates the correct combinations
At least one layer must contain all faceting variables: `b` and `c`
x Plot is missing `c`
x Layer 1 is missing `b`
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Faceting variables must have at least one value.
# validate_facets() provide meaningful errors
Please use `vars()` to supply facet variables.
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Please use `vars()` to supply facet variables.
i Did you use `%>%` or `|>` instead of `+`?
# check_layout() throws meaningful errors
Facet layout has a bad format. It must contain columns `PANEL`, `SCALE_X`, and `SCALE_Y`.
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