spec_guess_df.md
In tibblify: Rectangle Nested Lists

gives nice errors

Code
  (expect_error(guess_tspec_df(list(a = 1))))
Output
  <error/rlang_error>
  Error in `guess_tspec_df()`:
  ! `x` is a list but not a list of objects.
Code
  (expect_error(guess_tspec_df(1:3)))
Output
  <error/rlang_error>
  Error in `guess_tspec_df()`:
  ! Cannot guess the specification for type integer.

inform about unspecified elements

Code
  guess_tspec_df(tibble(lgl = NA), inform_unspecified = TRUE)
Message
  The spec contains 1 unspecified field:
  * lgl
Output
  tspec_df(
    tib_unspecified("lgl"),
  )