Always use lazy qualif getters during const-checking #68804
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Always use lazy qualif getters during const-checking `has_mut_interior_eager_seek` was needed to work around an overly restrictive bound on the `per_local` argument to the `Qualif` trait. This PR makes that bound `FnMut` instead of `Fn` so we can seek cursors inside of it, resolving a FIXME in the const-checking code.
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has_mut_interior_eager_seekwas needed to work around an overly restrictive bound on theper_localargument to theQualiftrait. This PR makes that boundFnMutinstead ofFnso we can seek cursors inside of it, resolving a FIXME in the const-checking code.