The "class" typeclass object has no import time effect
The "class" typeclass object has no import time effect

(cache_class is idempotent and commutes with other calls to it so this
patch should have no observable behaviour change)

SkySkimmer/coq,Zimmi48/coq,ejgallego/coq,ejgallego/coq,coq/coq,SkySkimmer/coq,Zimmi48/coq,coq/coq,SkySkimmer/coq,SkySkimmer/coq,coq/coq,Zimmi48/coq,coq/coq,Zimmi48/coq,ejgallego/coq,ejgallego/coq