haven-stata.md
In haven: Import and Export 'SPSS', 'Stata' and 'SAS' Files

invalid files generate informative errors

Code
  long <- paste(rep("a", 100), collapse = "")
  write_dta(data.frame(x = 1), tempfile(), label = long)
Condition
  Error in `write_dta()`:
  ! `label` must be 80 characters or fewer.
Code
  df <- data.frame(1)
  names(df) <- "x y"
  write_dta(df, tempfile(), version = 13)
Condition
  Error in `write_dta()`:
  ! Variables in `data` must have valid Stata variable names.
  x Problems: `x y`
Code
  names(df) <- long
  write_dta(df, tempfile(), version = 13)
Condition
  Error in `write_dta()`:
  ! Variables in `data` must have valid Stata variable names.
  x Problems: `aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa`
Code
  write_dta(df, tempfile(), version = 14)
Condition
  Error in `write_dta()`:
  ! Variables in `data` must have valid Stata variable names.
  x Problems: `aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa`

can't write non-integer labels (#401)

Code
  df <- data.frame(x = labelled(c(1, 2.5, 3), c(b = 1.5)))
  write_dta(df, tempfile())
Condition
  Error in `write_dta()`:
  ! Stata only supports labelling with integer variables.
  x Problems: `x`