25 Feb
2016
25 Feb
'16
4:35 p.m.
Mark Roberts
Perhaps such warnings could be added to a tool like HLint? I do not think they belong in GHC.
People have circulated somewhat convincing examples that show how these Functor instances lead to real bugs. I doubt they would agree. Besides -- these warning are supposed to be opt-in at the use sites, aren't they? -- с уважениeм / respectfully, Косырев Сергей