It's a special case of something that's unmentioned: creating temporary values in aggregates.
That's a great point. If you missed it, consider this:
my $item = 'wibble';
my @things = qw /foo bar baz/;
local $things[1] = 'qux'; # Legal
local $item = 'wobble'; # Dies with 'Can't localize lexical variable
+ $item'
-xdg
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