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use hir::map as hir_map;
use rustc::hir;
use rustc::hir::def_id::{self, CrateNum, DefId, LOCAL_CRATE};
use rustc::hir::itemlikevisit::ItemLikeVisitor;
use rustc::ty::maps::Providers;
use rustc::ty::{self, CratePredicatesMap, TyCtxt};
use rustc_data_structures::sync::Lrc;
use util::nodemap::FxHashMap;
pub fn empty_predicate_map<'tcx>(
tcx: TyCtxt<'_, 'tcx, 'tcx>,
) -> FxHashMap<DefId, Lrc<Vec<ty::Predicate<'tcx>>>> {
let mut predicates = FxHashMap();
tcx.hir
.krate()
.visit_all_item_likes(&mut EmptyImplicitVisitor {
tcx,
predicates: &mut predicates,
});
predicates
}
pub struct EmptyImplicitVisitor<'cx, 'tcx: 'cx> {
tcx: TyCtxt<'cx, 'tcx, 'tcx>,
predicates: &'cx mut FxHashMap<DefId, Lrc<Vec<ty::Predicate<'tcx>>>>,
}
impl<'a, 'p, 'v> ItemLikeVisitor<'v> for EmptyImplicitVisitor<'a, 'p> {
fn visit_item(&mut self, item: &hir::Item) {
self.predicates
.insert(self.tcx.hir.local_def_id(item.id), Lrc::new(Vec::new()));
}
fn visit_trait_item(&mut self, trait_item: &hir::TraitItem) {}
fn visit_impl_item(&mut self, impl_item: &hir::ImplItem) {}
}