Maybe unrelated, but I will remove that extension "Symbol >> #extern:", which manipulates the symbol tables for a single test in CompilerExceptionTest, present since March 2020. I think that 1) garbage collection should take care of unused symbols and 2) test can find a better way to produce "unknown symbols" :-)

Best,
Marcel
Am 13.04.2021 07:16:48 schrieb Chris Muller <asqueaker at gmail.com>:
For those wondering, the problem is that some Symbol get duplicated
violating the contract:
any two Symbols are either identical (==) or different (~=).

Possible become without copyHash? 
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