Here's a legacy script that has a function that locks it's argument
which is a dictionary in this example. Since this is probably the most
complex legacy script I've written, I want to make sure it's
expected/good behavior. (the proceeding after an error is spooky, but
convenient...)
Asking because vim9script doesn't handle it.
-ernie
func Lock(x)
lockvar a:x
endfunc
let val = {'a': 99}
call Lock(val)
call extend(val, {'b': 100})
echo val
let val = {'c': 101}
echo val
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