If we move altered inside this lambda, the next invocations of the outter
lambda will see a corrupted value. So in the case of smp, invoke_on_all will
invoke correctly in the first shard, but then see a bogus altered vector on
the subsequent ones.
Capturing a reference is fine, because the outer lambda will not be destroyed
until the inner one completes - so the object will live in the capture list.
Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
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