Each call of tcx.{declared_,explicit_,}predicates_of clones the GenericPredicate struct, which includes a Vec.

[eddyb]

Did we forget to intern/Rc it? cc @nikomatsakis @arielb1 @nnethercote

[nnethercote]

I can't find a function or method called generic_predicates. What is the code location?

[eddyb]

Sorry, I mistyped. I meant all the functions in rustc::ty::query that return GenericPredicates.

[nikomatsakis]

I've noticed this before but never filed an issue. I think we probably ought to Rc, yes.

[nikomatsakis]

(Or intern)

[nnethercote]

#55778 fixes some of these, the ones that show up in profiles. There are still a couple more that were more annoying to fix.