hipspec
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Hipspec performs worse if there are missing type signatures
For example, hipspec cannot prove the prop from here unless the type signature for (++) is uncommented.
Judging by the *.mlw files, this is due to redundant apps. The bug seems to be introduced by the commit a63a8fe6264fcb27d4e6cec525d5e06d7677db8a
Thanks sergei-grechanik, I have had a similar problem before, yours differs by involving a polymorphic function. The culprit is simpFun in SimplifyRich, but I will have to tend to it later.