Bugs Found

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erlingal edited this page Sep 17, 2018 · 9 revisions

We keep finding bugs in GHC as we develop lens.

I've started a rogues' gallery here:

RULES don't apply to a newtype constructor
Derived Foldable and Traversable instances become extremely inefficient due to eta-expansion
A strictness bug in ByteString
GHC doesn't optimize (strict) composition with id
unsafeCoerce without extensions
Exciting arity warnings can be triggered by the heavy use of lens in GHC 7.4.x and below.