[WIP] Create some minimal HIR for associated opaque types

Author: petrochenkov

compiler/rustc_ast_lowering/src/index.rs

@@ -55,6 +55,7 @@ pub(super) fn index_hir<'hir>(
         OwnerNode::TraitItem(item) => collector.visit_trait_item(item),
         OwnerNode::ImplItem(item) => collector.visit_impl_item(item),
         OwnerNode::ForeignItem(item) => collector.visit_foreign_item(item),
+        OwnerNode::AssocOpaqueTy(..) => unreachable!(),
     };
 
     for (local_id, node) in collector.nodes.iter_enumerated() {

compiler/rustc_hir/src/hir.rs

@@ -2548,6 +2548,11 @@ pub struct OpaqueTy<'hir> {
     pub in_trait: bool,
 }
 
+#[derive(Copy, Clone, Debug, HashStable_Generic)]
+pub struct AssocOpaqueTy {
+    // Maybe add some data if necessary
+}
+
 /// From whence the opaque type came.
 #[derive(Copy, Clone, PartialEq, Eq, Debug, HashStable_Generic)]
 pub enum OpaqueTyOrigin {
@@ -3331,6 +3336,7 @@ pub enum OwnerNode<'hir> {
     TraitItem(&'hir TraitItem<'hir>),
     ImplItem(&'hir ImplItem<'hir>),
     Crate(&'hir Mod<'hir>),
+    AssocOpaqueTy(&'hir AssocOpaqueTy),
 }
 
 impl<'hir> OwnerNode<'hir> {
@@ -3340,7 +3346,7 @@ impl<'hir> OwnerNode<'hir> {
             | OwnerNode::ForeignItem(ForeignItem { ident, .. })
             | OwnerNode::ImplItem(ImplItem { ident, .. })
             | OwnerNode::TraitItem(TraitItem { ident, .. }) => Some(*ident),
-            OwnerNode::Crate(..) => None,
+            OwnerNode::Crate(..) | OwnerNode::AssocOpaqueTy(..) => None,
         }
     }
 
@@ -3353,6 +3359,7 @@ impl<'hir> OwnerNode<'hir> {
             | OwnerNode::ImplItem(ImplItem { span, .. })
             | OwnerNode::TraitItem(TraitItem { span, .. }) => span,
             OwnerNode::Crate(Mod { spans: ModSpans { inner_span, .. }, .. }) => inner_span,
+            OwnerNode::AssocOpaqueTy(..) => unreachable!(),
         }
     }
 
@@ -3411,6 +3418,7 @@ impl<'hir> OwnerNode<'hir> {
             | OwnerNode::ImplItem(ImplItem { owner_id, .. })
             | OwnerNode::ForeignItem(ForeignItem { owner_id, .. }) => *owner_id,
             OwnerNode::Crate(..) => crate::CRATE_HIR_ID.owner,
+            OwnerNode::AssocOpaqueTy(..) => unreachable!(),
         }
     }
 
@@ -3454,6 +3462,7 @@ impl<'hir> Into<Node<'hir>> for OwnerNode<'hir> {
             OwnerNode::ImplItem(n) => Node::ImplItem(n),
             OwnerNode::TraitItem(n) => Node::TraitItem(n),
             OwnerNode::Crate(n) => Node::Crate(n),
+            OwnerNode::AssocOpaqueTy(n) => Node::AssocOpaqueTy(n),
         }
     }
 }
@@ -3491,6 +3500,7 @@ pub enum Node<'hir> {
     WhereBoundPredicate(&'hir WhereBoundPredicate<'hir>),
     // FIXME: Merge into `Node::Infer`.
     ArrayLenInfer(&'hir InferArg),
+    AssocOpaqueTy(&'hir AssocOpaqueTy),
     // Span by reference to minimize `Node`'s size
     #[allow(rustc::pass_by_value)]
     Err(&'hir Span),
@@ -3541,6 +3551,7 @@ impl<'hir> Node<'hir> {
             | Node::Infer(..)
             | Node::WhereBoundPredicate(..)
             | Node::ArrayLenInfer(..)
+            | Node::AssocOpaqueTy(..)
             | Node::Err(..) => None,
         }
     }
@@ -3646,6 +3657,7 @@ impl<'hir> Node<'hir> {
             Node::TraitItem(i) => Some(OwnerNode::TraitItem(i)),
             Node::ImplItem(i) => Some(OwnerNode::ImplItem(i)),
             Node::Crate(i) => Some(OwnerNode::Crate(i)),
+            Node::AssocOpaqueTy(i) => Some(OwnerNode::AssocOpaqueTy(i)),
             _ => None,
         }
     }

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -194,6 +194,7 @@ fn check_well_formed(tcx: TyCtxt<'_>, def_id: hir::OwnerId) -> Result<(), ErrorG
         hir::OwnerNode::TraitItem(item) => check_trait_item(tcx, item),
         hir::OwnerNode::ImplItem(item) => check_impl_item(tcx, item),
         hir::OwnerNode::ForeignItem(item) => check_foreign_item(tcx, item),
+        hir::OwnerNode::AssocOpaqueTy(..) => unreachable!(),
     };
 
     if let Some(generics) = node.generics() {

compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs

@@ -270,6 +270,7 @@ fn resolve_bound_vars(tcx: TyCtxt<'_>, local_def_id: hir::OwnerId) -> ResolveBou
             visitor.visit_impl_item(item)
         }
         hir::OwnerNode::Crate(_) => {}
+        hir::OwnerNode::AssocOpaqueTy(..) => unreachable!(),
     }
 
     let mut rl = ResolveBoundVars::default();

compiler/rustc_hir_pretty/src/lib.rs

@@ -121,6 +121,7 @@ impl<'a> State<'a> {
                 self.print_bounds(":", pred.bounds);
             }
             Node::ArrayLenInfer(_) => self.word("_"),
+            Node::AssocOpaqueTy(..) => unreachable!(),
             Node::Err(_) => self.word("/*ERROR*/"),
         }
     }

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -2059,7 +2059,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let mut call_finder = FindClosureArg { tcx: self.tcx, calls: vec![] };
                 let node = self
                     .tcx
-                    .opt_local_def_id_to_hir_id(self.tcx.hir().get_parent_item(call_expr.hir_id))
+                    .opt_local_def_id_to_hir_id(
+                        self.tcx.hir().get_parent_item(call_expr.hir_id).def_id,
+                    )
                     .map(|hir_id| self.tcx.hir_node(hir_id));
                 match node {
                     Some(hir::Node::Item(item)) => call_finder.visit_item(item),

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -2564,6 +2564,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
             hir::OwnerNode::ImplItem(i) => visitor.visit_impl_item(i),
             hir::OwnerNode::TraitItem(i) => visitor.visit_trait_item(i),
             hir::OwnerNode::Crate(_) => bug!("OwnerNode::Crate doesn't not have generics"),
+            hir::OwnerNode::AssocOpaqueTy(..) => unreachable!(),
         }
 
         let ast_generics = self.tcx.hir().get_generics(lifetime_scope).unwrap();

compiler/rustc_lint/src/late.rs

@@ -356,7 +356,7 @@ pub fn late_lint_mod<'tcx, T: LateLintPass<'tcx> + 'tcx>(
         cached_typeck_results: Cell::new(None),
         param_env: ty::ParamEnv::empty(),
         effective_visibilities: tcx.effective_visibilities(()),
-        last_node_with_lint_attrs: tcx.local_def_id_to_hir_id(module_def_id.into()),
+        last_node_with_lint_attrs: tcx.local_def_id_to_hir_id(module_def_id),
         generics: None,
         only_module: true,
     };

compiler/rustc_lint/src/levels.rs

@@ -190,6 +190,7 @@ fn shallow_lint_levels_on(tcx: TyCtxt<'_>, owner: hir::OwnerId) -> ShallowLintLe
                 levels.add_id(hir::CRATE_HIR_ID);
                 levels.visit_mod(mod_, mod_.spans.inner_span, hir::CRATE_HIR_ID)
             }
+            hir::OwnerNode::AssocOpaqueTy(..) => unreachable!(),
         },
     }
 

compiler/rustc_middle/src/arena.rs

@@ -115,6 +115,7 @@ macro_rules! arena_types {
             [] features: rustc_feature::Features,
             [decode] specialization_graph: rustc_middle::traits::specialization_graph::Graph,
             [] crate_inherent_impls: rustc_middle::ty::CrateInherentImpls,
+            [] hir_owner_nodes: rustc_hir::OwnerNodes<'tcx>,
         ]);
     )
 }