[vim/vim] Calling empty() on the return value of a void Vim9 script :def/lambda function gives E340 (Issue #19897)

[Peter Kenny]

kennypete created an issue (vim/vim#19897)

Steps to reproduce

Calling empty() on the return value of a void function (e.g., empty(F()) or F()->empty()) produces E340 rather than the expected E1186. The following script demonstrates it:

vim9script
var F: func = (): void => {
  # Do nothing
}
try
  echo F()
catch
  echo v:exception  # E1186 (as expected)
  try
    echo F()->empty()
  catch
    echo v:exception
    # E340: Internal error; if you can reproduce please report a bug
  endtry
endtry

Expected behaviour

E1186 should be given because it should fail earlier when the expression is evaluated as having no value rather than being passed to the builtin function, empty().

Version of Vim

9.2.204

Environment

Same result on Windows 11 gVim 9.2.235 and WSL Arch Vim 9.2.204

Logs and stack traces

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