New error when using `weightit` argument

[strengejacke]

The following example used to work, but now fails. Do you have any ideas, why?

data("lalonde", package = "cobalt")

# Logistic regression ATT weights
w.out <- WeightIt::weightit(
  treat ~ age + educ + married + re74,
  data = lalonde,
  method = "glm",
  estimand = "ATT"
)
set.seed(123)
fit3 <- WeightIt::lm_weightit(
  re78 ~ treat + age + educ,
  data = lalonde,
  weightit = w.out,
  vcov = "FWB",
  R = 50, # should use way more
  fwb.args = list(wtype = "mammen")
)
#> Error in `WeightIt::lm_weightit()`:
#> ! The supplied `weightit` object does not appear to be the result of a
#> call to `weightit()` or `weightitMSM()`, so bootstrapping cannot be
#> used.

^{Created on 2025-09-19 with reprex v2.1.1}

[ngreifer]

Yeah, a stupid mistake I made, sorry! If you load WeightIt with library() first and then call weightit() instead of WeightIt::weightit() it should be fine. I'll make this change in dev but it might be a few weeks before it's on CRAN.

[strengejacke]

It's used in tests, so I'd prefer to avoid using library(). But the tests are skipped on CRAN anyway, and I would probably just skip the test for the current WeightIt version and make it conditional on the forthcoming version(s).