retrieve variable name

Hello,

<--
let s:vara = 1
let s:varb = 2
let s:vars = [ s:vara, s:varb ]
for mvar in s:vars
echo ?name_of_var?(mvar)
endfor
--> would print
s:vara
s:varb
--

Any suggestion for ?name_of_var?

Thanks in advance for your help,

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| Alexandre Hoïde   |  _/| |
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