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>    I found this bug doing some experiments with afl++. It's strange that it
>    was not found by oss-fuzz project.

Its behavior is weird. A simple "local _ENV <const> = 0; X = 0" is
enough to trigger the bug, as it violates an assertion. With assertions
off (the default), however, it is very difficult to create a scenario
that causes a seg. fault. Even your example does not cause a seg. fault
when I use it under valgrind.

-- Roberto