[vim/vim] Can't unpack a tuple in a function when get it from a function in another file (Issue #19080)

[Mao-Yining]

mao-yining created an issue (vim/vim#19080)

Steps to reproduce

File a.vim:

vim9script
export def R(): tuple<string, string>
	return ('foo', 'bar')
enddef

File b.vim

vim9script
import autoload "./a.vim"
def R()
	const [foo, bar] = a.R()
	echo foo bar
enddef
R()

Run :so in file b.vim, The result

Error detected while processing b.vim[7]..function <SNR>217_R:
line    1:
E1012: Type mismatch; expected list<any> but got tuple<string, string>

Expected behaviour

Unpack the tuple correctly. Such as this b.vim don't have error:

vim9script
import autoload "./a.vim"
const [foo, bar] = a.R()
echo foo bar

Output: foo bar

Version of Vim

gVim 9.1.2049

Environment

Windows 11

Logs and stack traces

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[Christian Brabandt]

Closed #19080 as completed via eb577f9.

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