Remove DUMMY_HIR_ID

src/librustc_hir/definitions.rs

@@ -7,7 +7,6 @@
 pub use crate::def_id::DefPathHash;
 use crate::def_id::{CrateNum, DefId, DefIndex, LocalDefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 use crate::hir;
-use crate::hir_id::DUMMY_HIR_ID;
 
 use rustc_ast::ast;
 use rustc_ast::crate_disambiguator::CrateDisambiguator;
@@ -345,8 +344,7 @@ impl Definitions {
     #[inline]
     pub fn as_local_hir_id(&self, def_id: DefId) -> Option<hir::HirId> {
         if let Some(def_id) = def_id.as_local() {
-            let hir_id = self.local_def_id_to_hir_id(def_id);
+            Some(self.local_def_id_to_hir_id(def_id))
-            if hir_id != DUMMY_HIR_ID { Some(hir_id) } else { None }
         } else {
             None
         }

src/librustc_hir/hir_id.rs

@@ -45,7 +45,4 @@ pub const CRATE_HIR_ID: HirId = HirId {
     local_id: ItemLocalId::from_u32(0),
 };
 
-pub const DUMMY_HIR_ID: HirId =
-    HirId { owner: LocalDefId { local_def_index: CRATE_DEF_INDEX }, local_id: DUMMY_ITEM_LOCAL_ID };
-
 pub const DUMMY_ITEM_LOCAL_ID: ItemLocalId = ItemLocalId::MAX;

src/librustc_middle/hir/map/collector.rs

@@ -250,23 +250,16 @@ impl<'a, 'hir> NodeCollector<'a, 'hir> {
                     None => format!("{:?}", node),
                 };
 
-                let forgot_str = if hir_id == hir::DUMMY_HIR_ID {
-                    format!("\nMaybe you forgot to lower the node id {:?}?", node_id)
-                } else {
-                    String::new()
-                };
-
                 span_bug!(
                     span,
                     "inconsistent DepNode at `{:?}` for `{}`: \
-                     current_dep_node_owner={} ({:?}), hir_id.owner={} ({:?}){}",
+                     current_dep_node_owner={} ({:?}), hir_id.owner={} ({:?})",
                     self.source_map.span_to_string(span),
                     node_str,
                     self.definitions.def_path(self.current_dep_node_owner).to_string_no_crate(),
                     self.current_dep_node_owner,
                     self.definitions.def_path(hir_id.owner).to_string_no_crate(),
                     hir_id.owner,
-                    forgot_str,
                 )
             }
         }

src/librustc_middle/middle/stability.rs

@@ -215,7 +215,6 @@ fn late_report_deprecation(
     suggestion: Option<Symbol>,
     lint: &'static Lint,
     span: Span,
-    def_id: DefId,
     hir_id: HirId,
 ) {
     if span.in_derive_expansion() {
@@ -229,9 +228,6 @@ fn late_report_deprecation(
         }
         diag.emit()
     });
-    if hir_id == hir::DUMMY_HIR_ID {
-        span_bug!(span, "emitted a {} lint with dummy HIR id: {:?}", lint.name, def_id);
-    }
 }
 
 /// Result of `TyCtxt::eval_stability`.
@@ -296,7 +292,7 @@ impl<'tcx> TyCtxt<'tcx> {
                 if !skip {
                     let (message, lint) =
                         deprecation_message(&depr_entry.attr, &self.def_path_str(def_id));
-                    late_report_deprecation(self, &message, None, lint, span, def_id, id);
+                    late_report_deprecation(self, &message, None, lint, span, id);
                 }
             };
         }
@@ -319,15 +315,7 @@ impl<'tcx> TyCtxt<'tcx> {
                 if let Some(depr) = &stability.rustc_depr {
                     let (message, lint) =
                         rustc_deprecation_message(depr, &self.def_path_str(def_id));
-                    late_report_deprecation(
+                    late_report_deprecation(self, &message, depr.suggestion, lint, span, id);
-                        self,
-                        &message,
-                        depr.suggestion,
-                        lint,
-                        span,
-                        def_id,
-                        id,
-                    );
                 }
             }
         }

src/librustc_passes/hir_id_validator.rs

@@ -143,16 +143,6 @@ impl<'a, 'hir> intravisit::Visitor<'hir> for HirIdValidator<'a, 'hir> {
     fn visit_id(&mut self, hir_id: HirId) {
         let owner = self.owner.expect("no owner");
 
-        if hir_id == hir::DUMMY_HIR_ID {
-            self.error(|| {
-                format!(
-                    "HirIdValidator: HirId {:?} is invalid",
-                    self.hir_map.node_to_string(hir_id)
-                )
-            });
-            return;
-        }
-
         if owner != hir_id.owner {
             self.error(|| {
                 format!(

src/librustc_resolve/late/lifetimes.rs

@@ -2704,14 +2704,6 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
     }
 
     fn insert_lifetime(&mut self, lifetime_ref: &'tcx hir::Lifetime, def: Region) {
-        if lifetime_ref.hir_id == hir::DUMMY_HIR_ID {
-            span_bug!(
-                lifetime_ref.span,
-                "lifetime reference not renumbered, \
-                 probably a bug in rustc_ast::fold"
-            );
-        }
-
         debug!(
             "insert_lifetime: {} resolved to {:?} span={:?}",
             self.tcx.hir().node_to_string(lifetime_ref.hir_id),

src/librustc_typeck/check/method/probe.rs

@@ -860,9 +860,6 @@ impl<'a, 'tcx> ProbeContext<'a, 'tcx> {
         &mut self,
         expr_hir_id: hir::HirId,
     ) -> Result<(), MethodError<'tcx>> {
-        if expr_hir_id == hir::DUMMY_HIR_ID {
-            return Ok(());
-        }
         let mut duplicates = FxHashSet::default();
         let opt_applicable_traits = self.tcx.in_scope_traits(expr_hir_id);
         if let Some(applicable_traits) = opt_applicable_traits {

src/librustdoc/clean/mod.rs

@@ -375,18 +375,16 @@ impl<'tcx> Clean<Option<Vec<GenericBound>>> for InternalSubsts<'tcx> {
 
 impl Clean<Lifetime> for hir::Lifetime {
     fn clean(&self, cx: &DocContext<'_>) -> Lifetime {
-        if self.hir_id != hir::DUMMY_HIR_ID {
+        let def = cx.tcx.named_region(self.hir_id);
-            let def = cx.tcx.named_region(self.hir_id);
+        match def {
-            match def {
+            Some(rl::Region::EarlyBound(_, node_id, _))
-                Some(rl::Region::EarlyBound(_, node_id, _))
+            | Some(rl::Region::LateBound(_, node_id, _))
-                | Some(rl::Region::LateBound(_, node_id, _))
+            | Some(rl::Region::Free(_, node_id)) => {
-                | Some(rl::Region::Free(_, node_id)) => {
+                if let Some(lt) = cx.lt_substs.borrow().get(&node_id).cloned() {
-                    if let Some(lt) = cx.lt_substs.borrow().get(&node_id).cloned() {
+                    return lt;
-                        return lt;
-                    }
                 }
-                _ => {}
             }
+            _ => {}
         }
         Lifetime(self.name.ident().to_string())
     }

src/librustdoc/clean/utils.rs

@@ -580,11 +580,7 @@ pub fn print_const_expr(cx: &DocContext<'_>, body: hir::BodyId) -> String {
 
 /// Given a type Path, resolve it to a Type using the TyCtxt
 pub fn resolve_type(cx: &DocContext<'_>, path: Path, id: hir::HirId) -> Type {
-    if id == hir::DUMMY_HIR_ID {
+    debug!("resolve_type({:?},{:?})", path, id);
-        debug!("resolve_type({:?})", path);
-    } else {
-        debug!("resolve_type({:?},{:?})", path, id);
-    }
 
     let is_generic = match path.res {
         Res::PrimTy(p) => return Primitive(PrimitiveType::from(p)),