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Am 10.08.2020 um 16:34 schrieb Roberto Ierusalimschy:
>> I think Lua relies on the behaviour that the realloc-like function
>> does not return a different pointer (copy) for shrinking an existing
>> block. Maybe that could be a problem for some allocators.
> Lua does not rely on that. The only assumption was that shrinking
> an existing block could not fail, but it can move the block without
> problems. Actually, the test suite in Lua has a mode that forces every
> single reallocation (growing, shrinking, or to the same size!) to move
> the block.

My test program was flawed. Sorry.

> Lua 5.4 has removed this restriction of "no fail when shrinking".
> -- Roberto

Wow, so this is why it is no longer in the manual.
I wonder if there is any system with C support left that can't
run Lua :)