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. Answers to this question are eligible for a +50 reputation bounty. Sh ...
The following snippet makes GHC (checked with 8.6.2 & 8.4.4) stuck during compilation: I think that it gets stuck because for t GHC tries to fi ...
I'm trying to build an AST with indexed nested annotations. I added a typeclass for peeling the annotation at the top-level and tried to provide defau ...
1) Is a Turing machine M that accepts the language L = {ε}, accepting no entry? In one hand, I think it can be false because the empty word could be ...
By the time I first read serious criticism on -XUndecidableInstances, I had already completely accustomed to it, seeing it as merely removal of an ann ...
Recently, I asked a question about an instance I had created generating a runtime infinite loop, and I got a wonderful answer! Now that I understand w ...
When writing some code using UndecidableInstances earlier, I ran into something that I found very odd. I managed to unintentionally create some code t ...