Auto merge of rust-lang#112974 - matthiaskrgr:rollup-hnk7ans, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#112616 (Improve tests on targets without unwinding)
 - rust-lang#112643 (Always register sized obligation for argument)
 - rust-lang#112740 (Add link to rustdoc book search chapter in help popover)
 - rust-lang#112810 (Don't ICE on unnormalized struct tail in layout computation)
 - rust-lang#112870 (Migrate `item_bounds` to `ty::Clause`)
 - rust-lang#112925 (Stop hiding const eval limit in external macros)
 - rust-lang#112960 ([tests/rustdoc] Add `@files` command)
 - rust-lang#112962 (Fix rustdoc gui tester)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -705,7 +705,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             ty::Alias(ty::Opaque, ty::AliasTy { def_id, substs, .. }) => tcx
                 .explicit_item_bounds(def_id)
                 .subst_iter_copied(tcx, substs)
-                .find_map(find_fn_kind_from_did),
+                .find_map(|(clause, span)| find_fn_kind_from_did((clause.as_predicate(), span))),
             ty::Closure(_, substs) => match substs.as_closure().kind() {
                 ty::ClosureKind::Fn => Some(hir::Mutability::Not),
                 ty::ClosureKind::FnMut => Some(hir::Mutability::Mut),

compiler/rustc_hir_analysis/src/check/mod.rs

@@ -409,9 +409,7 @@ fn fn_sig_suggestion<'tcx>(
         output = if let ty::Alias(_, alias_ty) = *output.kind() {
             tcx.explicit_item_bounds(alias_ty.def_id)
                 .subst_iter_copied(tcx, alias_ty.substs)
-                .find_map(|(bound, _)| {
-                    bound.to_opt_poly_projection_pred()?.no_bound_vars()?.term.ty()
-                })
+                .find_map(|(bound, _)| bound.as_projection_clause()?.no_bound_vars()?.term.ty())
                 .unwrap_or_else(|| {
                     span_bug!(
                         ident.span,