[vim/vim] null_string as {sub} in substitute() crashes Vim when used in a function (Issue #18309)

[Peter Kenny]

kennypete created an issue (vim/vim#18309)

Using null_string as either {sub} and/or {flags} to substitute() at the script level works fine. The following script demonstrates that in its first three examples. (:1,10so)

Further, {flags} can be null_string when substitute() is within either a def or lambda function. The fourth and fifth examples show that. (:1,23so)

However, if {sub} is null_string in a def or lambda function, gVim freezes for a moment, then crashes. In WSL, it also crashes, though there is a Segmentation fault message. (:so) A screenshot follows the script showing what is generated.

[Windows gVim 9.1.1747 and WSL Vim 9.1.496]

vim9script

# '', '' works
echo 'Vimp'->substitute('p', '', '')

# '', null_string works
echo 'Vimp'->substitute('p', '', null_string)

# null_string, null_string works
echo 'Vimp'->substitute('p', null_string, null_string)

# def function with '', null_string works
def F1(s: string): string
    return s->substitute('p', '', null_string)
enddef
echo 'Vimp'->F1()

# lambda function with '', null_string works
const F2: func = (s: string): string => {
    return s->substitute('p', '', null_string)
  }
echo 'Vimp'->F2()

# def function with null_string, null_string crashes Vim
def C1(s: string): string
    return s->substitute('p', null_string, null_string)
enddef
echo 'Vimp'->C1()

# lambda function with null_string, null_string crashes Vim
const C2: func = (s: string): string => {
    return s->substitute('p', null_string, null_string)
  }
echo 'Vimp'->C2()

segmentation-fault.png (view on web)

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[Christian Brabandt]

Closed #18309 as completed via afa2a81.

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