`summarise()` and `reframe()` turns warnings from inside functions as errors

[psychelzh]

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---

In the following example, the dplyr warning will result into an error:

suppressPackageStartupMessages(library(dplyr))
f <- function() {
  data.frame(id = 1:2) |> 
    summarise(n = warning("test"), .by = "id")
}
mtcars |> 
  reframe(f(), .by = "gear")
#> Error:
#> ! Failed to evaluate glue component {label}
#> Caused by error in `vapply()`:
#> ! values must be length 1,
#>  but FUN(X[[1]]) result is length 0

^{Created on 2024-04-02 with reprex v2.1.0}

[kelliemac]

I just ran into this error, and am glad to find it documented here. It is strange and disruptive behavior that a warning in the function f() escalates to an error when f() is applied with reframe. The error message is also unhelpful. Note that the same thing happens when using summarize() instead of reframe().