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Simon Marlow authored
This patch was the cause of the compile-time performance regression in #3796. My guess is that it is due to the use of unsafePerformIO which traverses the stack up to the first update frame, and perhaps we have a deep stack when reading the dictionary from a .hi file. In any case, since we're not relying on thread safety for FastStrings, I think the safest thing to do is back this out until we can investigate further.
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