standalone-types-check.md
In rlang: Functions for Base Types and Core R and 'Tidyverse' Features

`check_character()` checks

Code
  err(checker(, check_character))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a character vector, not absent.
Code
  err(checker(NULL, check_character))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a character vector, not `NULL`.
Code
  err(checker(NA, check_character))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a character vector, not `NA`.
Code
  err(checker(1, check_character))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a character vector, not the number 1.
Code
  err(checker(list("foo", "bar"), check_character, allow_null = TRUE))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a character vector or `NULL`, not a list.
Code
  err(checker(c("a", NA), check_character, allow_na = FALSE))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` can't contain NA values.

`check_logical()` checks

Code
  err(checker(, check_logical))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a logical vector, not absent.
Code
  err(checker(NULL, check_logical))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a logical vector, not `NULL`.
Code
  err(checker(NA_integer_, check_logical))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a logical vector, not an integer `NA`.
Code
  err(checker(1, check_logical))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a logical vector, not the number 1.
Code
  err(checker(list("foo", "bar"), check_logical, allow_null = TRUE))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` must be a logical vector or `NULL`, not a list.
Code
  err(checker(NA, check_logical, allow_na = FALSE))
Output
  <error/rlang_error>
  Error in `checker()`:
  ! `foo` can't contain NA values.