Rollup merge of #71092 - marmeladema:dummy-hir-id-removal, r=eddyb

Remove some usage of `DUMMY_HIR_ID`

src/librustc_infer/infer/error_reporting/mod.rs

@@ -191,7 +191,7 @@ fn msg_span_from_early_bound_and_free_regions(
     let sm = tcx.sess.source_map();
 
     let scope = region.free_region_binding_scope(tcx);
-    let node = tcx.hir().as_local_hir_id(scope).unwrap_or(hir::DUMMY_HIR_ID);
+    let node = tcx.hir().as_local_hir_id(scope).unwrap();
     let tag = match tcx.hir().find(node) {
         Some(Node::Block(_)) | Some(Node::Expr(_)) => "body",
         Some(Node::Item(it)) => item_scope_tag(&it),

src/librustc_lint/builtin.rs

@@ -1354,7 +1354,7 @@ fn check_pat_post(&mut self, _cx: &EarlyContext<'_>, pat: &ast::Pat) {
 }
 
 pub struct UnnameableTestItems {
-    boundary: hir::HirId, // HirId of the item under which things are not nameable
+    boundary: Option<hir::HirId>, // HirId of the item under which things are not nameable
     items_nameable: bool,
 }
 
@@ -1362,7 +1362,7 @@ pub struct UnnameableTestItems {
 
 impl UnnameableTestItems {
     pub fn new() -> Self {
-        Self { boundary: hir::DUMMY_HIR_ID, items_nameable: true }
+        Self { boundary: None, items_nameable: true }
     }
 }
 
@@ -1372,7 +1372,7 @@ fn check_item(&mut self, cx: &LateContext<'_, '_>, it: &hir::Item<'_>) {
             if let hir::ItemKind::Mod(..) = it.kind {
             } else {
                 self.items_nameable = false;
-                self.boundary = it.hir_id;
+                self.boundary = Some(it.hir_id);
             }
             return;
         }
@@ -1385,7 +1385,7 @@ fn check_item(&mut self, cx: &LateContext<'_, '_>, it: &hir::Item<'_>) {
     }
 
     fn check_item_post(&mut self, _cx: &LateContext<'_, '_>, it: &hir::Item<'_>) {
-        if !self.items_nameable && self.boundary == it.hir_id {
+        if !self.items_nameable && self.boundary == Some(it.hir_id) {
             self.items_nameable = true;
         }
     }

src/librustc_lint/types.rs

@@ -43,14 +43,14 @@
 #[derive(Copy, Clone)]
 pub struct TypeLimits {
     /// Id of the last visited negated expression
-    negated_expr_id: hir::HirId,
+    negated_expr_id: Option<hir::HirId>,
 }
 
 impl_lint_pass!(TypeLimits => [UNUSED_COMPARISONS, OVERFLOWING_LITERALS]);
 
 impl TypeLimits {
     pub fn new() -> TypeLimits {
-        TypeLimits { negated_expr_id: hir::DUMMY_HIR_ID }
+        TypeLimits { negated_expr_id: None }
     }
 }
 
@@ -244,7 +244,7 @@ fn lint_int_literal<'a, 'tcx>(
     let int_type = t.normalize(cx.sess().target.ptr_width);
     let (min, max) = int_ty_range(int_type);
     let max = max as u128;
-    let negative = type_limits.negated_expr_id == e.hir_id;
+    let negative = type_limits.negated_expr_id == Some(e.hir_id);
 
     // Detect literal value out of range [min, max] inclusive
     // avoiding use of -min to prevent overflow/panic
@@ -397,8 +397,8 @@ fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx hir::Expr<'tcx>) {
         match e.kind {
             hir::ExprKind::Unary(hir::UnOp::UnNeg, ref expr) => {
                 // propagate negation, if the negation itself isn't negated
-                if self.negated_expr_id != e.hir_id {
-                    self.negated_expr_id = expr.hir_id;
+                if self.negated_expr_id != Some(e.hir_id) {
+                    self.negated_expr_id = Some(expr.hir_id);
                 }
             }
             hir::ExprKind::Binary(binop, ref l, ref r) => {

src/librustc_privacy/lib.rs

@@ -1012,7 +1012,7 @@ fn visit_def_id(&mut self, def_id: DefId, _kind: &str, _descr: &dyn fmt::Display
 struct NamePrivacyVisitor<'a, 'tcx> {
     tcx: TyCtxt<'tcx>,
     tables: &'a ty::TypeckTables<'tcx>,
-    current_item: hir::HirId,
+    current_item: Option<hir::HirId>,
     empty_tables: &'a ty::TypeckTables<'tcx>,
 }
 
@@ -1028,7 +1028,7 @@ fn check_field(
     ) {
         // definition of the field
         let ident = Ident::new(kw::Invalid, use_ctxt);
-        let current_hir = self.current_item;
+        let current_hir = self.current_item.unwrap();
         let def_id = self.tcx.adjust_ident_and_get_scope(ident, def.did, current_hir).1;
         if !def.is_enum() && !field.vis.is_accessible_from(def_id, self.tcx) {
             let label = if in_update_syntax {
@@ -1074,7 +1074,7 @@ fn visit_nested_body(&mut self, body: hir::BodyId) {
     }
 
     fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
-        let orig_current_item = mem::replace(&mut self.current_item, item.hir_id);
+        let orig_current_item = mem::replace(&mut self.current_item, Some(item.hir_id));
         let orig_tables =
             mem::replace(&mut self.tables, item_tables(self.tcx, item.hir_id, self.empty_tables));
         intravisit::walk_item(self, item);
@@ -2059,7 +2059,7 @@ fn check_mod_privacy(tcx: TyCtxt<'_>, module_def_id: DefId) {
     let mut visitor = NamePrivacyVisitor {
         tcx,
         tables: &empty_tables,
-        current_item: hir::DUMMY_HIR_ID,
+        current_item: None,
         empty_tables: &empty_tables,
     };
     let (module, span, hir_id) = tcx.hir().get_module(module_def_id);

src/librustc_traits/implied_outlives_bounds.rs

@@ -62,7 +62,7 @@ fn compute_implied_outlives_bounds<'tcx>(
         // unresolved inference variables here anyway, but there might be
         // during typeck under some circumstances.)
         let obligations =
-            wf::obligations(infcx, param_env, hir::DUMMY_HIR_ID, ty, DUMMY_SP).unwrap_or(vec![]);
+            wf::obligations(infcx, param_env, hir::CRATE_HIR_ID, ty, DUMMY_SP).unwrap_or(vec![]);
 
         // N.B., all of these predicates *ought* to be easily proven
         // true. In fact, their correctness is (mostly) implied by

src/librustc_ty/ty.rs

@@ -265,7 +265,7 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
     let unnormalized_env =
         ty::ParamEnv::new(tcx.intern_predicates(&predicates), traits::Reveal::UserFacing, None);
 
-    let body_id = tcx.hir().as_local_hir_id(def_id).map_or(hir::DUMMY_HIR_ID, |id| {
+    let body_id = tcx.hir().as_local_hir_id(def_id).map_or(hir::CRATE_HIR_ID, |id| {
         tcx.hir().maybe_body_owned_by(id).map_or(id, |body| body.hir_id)
     });
     let cause = traits::ObligationCause::misc(tcx.def_span(def_id), body_id);

src/librustc_typeck/check/demand.rs

@@ -217,14 +217,10 @@ pub fn get_conversion_methods(
         span: Span,
         expected: Ty<'tcx>,
         checked_ty: Ty<'tcx>,
+        hir_id: hir::HirId,
     ) -> Vec<AssocItem> {
-        let mut methods = self.probe_for_return_type(
-            span,
-            probe::Mode::MethodCall,
-            expected,
-            checked_ty,
-            hir::DUMMY_HIR_ID,
-        );
+        let mut methods =
+            self.probe_for_return_type(span, probe::Mode::MethodCall, expected, checked_ty, hir_id);
         methods.retain(|m| {
             self.has_no_input_arg(m)
                 && self

src/librustc_typeck/check/method/probe.rs

@@ -452,7 +452,7 @@ fn method_autoderef_steps<'tcx>(
     tcx.infer_ctxt().enter_with_canonical(DUMMY_SP, &goal, |ref infcx, goal, inference_vars| {
         let ParamEnvAnd { param_env, value: self_ty } = goal;
 
-        let mut autoderef = Autoderef::new(infcx, param_env, hir::DUMMY_HIR_ID, DUMMY_SP, self_ty)
+        let mut autoderef = Autoderef::new(infcx, param_env, hir::CRATE_HIR_ID, DUMMY_SP, self_ty)
             .include_raw_pointers()
             .silence_errors();
         let mut reached_raw_pointer = false;
@@ -1512,7 +1512,6 @@ fn probe_for_lev_candidate(&mut self) -> Result<Option<ty::AssocItem>, MethodErr
             );
             pcx.allow_similar_names = true;
             pcx.assemble_inherent_candidates();
-            pcx.assemble_extension_candidates_for_traits_in_scope(hir::DUMMY_HIR_ID)?;
 
             let method_names = pcx.candidate_method_names();
             pcx.allow_similar_names = false;
@@ -1522,10 +1521,7 @@ fn probe_for_lev_candidate(&mut self) -> Result<Option<ty::AssocItem>, MethodErr
                     pcx.reset();
                     pcx.method_name = Some(method_name);
                     pcx.assemble_inherent_candidates();
-                    pcx.assemble_extension_candidates_for_traits_in_scope(hir::DUMMY_HIR_ID)
-                        .map_or(None, |_| {
-                            pcx.pick_core().and_then(|pick| pick.ok()).map(|pick| pick.item)
-                        })
+                    pcx.pick_core().and_then(|pick| pick.ok()).map(|pick| pick.item)
                 })
                 .collect();
 

src/librustc_typeck/check/mod.rs

@@ -4981,7 +4981,7 @@ pub fn suggest_ref_or_into(
         } else if !self.check_for_cast(err, expr, found, expected) {
             let is_struct_pat_shorthand_field =
                 self.is_hir_id_from_struct_pattern_shorthand_field(expr.hir_id, expr.span);
-            let methods = self.get_conversion_methods(expr.span, expected, found);
+            let methods = self.get_conversion_methods(expr.span, expected, found, expr.hir_id);
             if let Ok(expr_text) = self.sess().source_map().span_to_snippet(expr.span) {
                 let mut suggestions = iter::repeat(&expr_text)
                     .zip(methods.iter())