check.md
In stbl: Stabilize Function Arguments

.check_na() works

Code
  .check_na(c(1, NA), allow_na = FALSE)
Condition
  Error:
  ! `c(1, NA)` must not contain NA values.
  * NA locations: 2

.check_size() works

Code
  .check_size(1:5, 6, 10)
Condition
  Error:
  ! `1:5` must have size >= 6.
  x 5 is too small.

Code
  .check_size(1:5, 1, 4)
Condition
  Error:
  ! `1:5` must have size <= 4.
  x 5 is too big.

.check_scalar() works

Code
  .check_scalar(1:2)
Condition
  Error:
  ! `1:2` must be a single <integer>.
  x `1:2` has 2 values.

Code
  .check_scalar(NULL, allow_null = FALSE)
Condition
  Error:
  ! `NULL` must be a single <non-NULL>.
  x `NULL` has no values.

Code
  .check_scalar(character(), allow_zero_length = FALSE)
Condition
  Error:
  ! `character()` must be a single <character (non-empty)>.
  x `character()` has no values.

.check_x_no_more_than_y() works

Code
  .check_x_no_more_than_y(2, 1)
Condition
  Error:
  ! `2` can't be larger than `1`.
  * `2` = 2
  * `1` = 1

.check_cast_failures() works

Code
  .check_cast_failures(failures = failures, x_class = "character", to = logical(),
  due_to = "incompatible values", x_arg = "test_arg", call = rlang::current_env())
Condition
  Error:
  ! `test_arg` <character> must be coercible to <logical>
  x Can't convert some values due to incompatible values.
  * Locations: 2 and 4