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" Backport getenv() from v8.1.1305, except return an empty string rather than
" v:null
"
" <https://github.com/vim/vim/releases/tag/v8.1.1305>
"
function! getenv#(name) abort
if a:name !~# '^[A-Z][A-Z0-9_]*$'
throw 'Illegal env var name'
endif
let value = ''
if exists('$'.a:name)
execute 'let value = $'.a:name
endif
return value
endfunction
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