Auto merge of rust-lang#107507 - BoxyUwU:deferred_projection_equality, r=lcnr

Implement `deferred_projection_equality` for erica solver

Somewhat of a revival of rust-lang#96912. When relating projections now emit an `AliasEq` obligation instead of attempting to determine equality of projections that may not be as normalized as possible (i.e. because of lazy norm, or just containing inference variables that prevent us from resolving an impl). Only do this when the new solver is enabled

Author: bors

clippy_utils/src/qualify_min_const_fn.rs

@@ -36,6 +36,7 @@ pub fn is_min_const_fn<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, msrv: &Msrv)
                 | ty::PredicateKind::ConstEvaluatable(..)
                 | ty::PredicateKind::ConstEquate(..)
                 | ty::PredicateKind::TypeWellFormedFromEnv(..) => continue,
+                ty::PredicateKind::AliasEq(..) => panic!("alias eq predicate on function: {predicate:#?}"),
                 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:#?}"),