mapping list with : v:val and index of v:val

Hi,

Trying this


let file = readfile(expand("%:p"),'b')
let g:file=map(copy(file),'v:val.":".index(copy(file), v:val)')

returns -1 for each v:val of list 'file' out of 0, 1 , 2 etc..


Thank you


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