specify_cls.md
In stbl: Stabilize Function Arguments

specify_cls builds the expected function snapshot with no args (#150)

Code
  baseline
Output
  function (x, ..., x_arg = rlang::caller_arg(x), call = rlang::caller_env(), 
      x_class = stbl::object_type(x)) 
  {
      stbl::stabilize_chr(x, ..., x_arg = x_arg, call = call, x_class = x_class)
  }
  attr(,"class")
  [1] "stbl_specified_fn" "function"

specify_cls builds the expected function snapshot with at least one arg (#150, #161)

Code
  no_null
Output
  function (x, ..., x_arg = rlang::caller_arg(x), call = rlang::caller_env(), 
      x_class = stbl::object_type(x)) 
  {
      {
          duplicated_args <- intersect(...names(), "allow_null")
          if (length(duplicated_args)) {
              stbl::pkg_abort("stbl", message = c("Arguments passed via `...` cannot duplicate specification.", 
                  i = "Duplicated arguments: {.arg {duplicated_args}}"), 
                  subclass = "duplicate_args")
          }
      }
      stbl::stabilize_chr(x, allow_null = FALSE, ..., x_arg = x_arg, 
          call = call, x_class = x_class)
  }
  attr(,"class")
  [1] "stbl_specified_fn" "function"

The function built via specify_cls errors informatively for duplicated args (#150, #153, #161)

Code
  no_null(NULL, allow_null = FALSE)
Condition
  Error in `no_null()`:
  ! Arguments passed via `...` cannot duplicate specification.
  i Duplicated arguments: `allow_null`

specify_cls builds the expected scalar function snapshot (#150)

Code
  scalar_checker
Output
  function (x, ..., x_arg = rlang::caller_arg(x), call = rlang::caller_env(), 
      x_class = stbl::object_type(x)) 
  {
      stbl::stabilize_chr_scalar(x, ..., x_arg = x_arg, call = call, 
          x_class = x_class)
  }
  attr(,"class")
  [1] "stbl_specified_fn" "function"