introduce a Coerce predicate

Author: nikomatsakis

clippy_utils/src/qualify_min_const_fn.rs

@@ -36,6 +36,9 @@ pub fn is_min_const_fn(tcx: TyCtxt<'tcx>, body: &'a Body<'tcx>, msrv: Option<&Ru
                 ty::PredicateKind::ObjectSafe(_) => panic!("object safe predicate on function: {:#?}", predicate),
                 ty::PredicateKind::ClosureKind(..) => panic!("closure kind predicate on function: {:#?}", predicate),
                 ty::PredicateKind::Subtype(_) => panic!("subtype predicate on function: {:#?}", predicate),
+                ty::PredicateKind::Coerce(_) => {
+                    panic!("coerce predicate on function: {:#?}", predicate)
+                },
                 ty::PredicateKind::Trait(pred) => {
                     if Some(pred.def_id()) == tcx.lang_items().sized_trait() {
                         continue;