resolve: Introduce RibKind::Block

to avoid confusing module items, blocks with items, and blocks without items.

Author: petrochenkov

compiler/rustc_resolve/src/ident.rs

@@ -331,7 +331,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
             }
 
             module = match rib.kind {
-                RibKind::Module(module) => module,
+                RibKind::Module(module) | RibKind::Block(Some(module)) => module,
                 RibKind::MacroDefinition(def) if def == self.macro_def(ident.span.ctxt()) => {
                     // If an invocation of this macro created `ident`, give up on `ident`
                     // and switch to `ident`'s source from the macro definition.
@@ -1154,6 +1154,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                 for rib in ribs {
                     match rib.kind {
                         RibKind::Normal
+                        | RibKind::Block(..)
                         | RibKind::FnOrCoroutine
                         | RibKind::Module(..)
                         | RibKind::MacroDefinition(..)
@@ -1246,6 +1247,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                 for rib in ribs {
                     let (has_generic_params, def_kind) = match rib.kind {
                         RibKind::Normal
+                        | RibKind::Block(..)
                         | RibKind::FnOrCoroutine
                         | RibKind::Module(..)
                         | RibKind::MacroDefinition(..)
@@ -1339,6 +1341,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                 for rib in ribs {
                     let (has_generic_params, def_kind) = match rib.kind {
                         RibKind::Normal
+                        | RibKind::Block(..)
                         | RibKind::FnOrCoroutine
                         | RibKind::Module(..)
                         | RibKind::MacroDefinition(..)

compiler/rustc_resolve/src/late.rs

@@ -193,6 +193,13 @@ pub(crate) enum RibKind<'ra> {
     /// No restriction needs to be applied.
     Normal,
 
+    /// We passed through an `ast::Block`.
+    /// Behaves like `Normal`, but also partially like `Module` if the block contains items.
+    /// `Block(None)` must be always processed in the same way as `Block(Some(module))`
+    /// with empty `module`. The module can be `None` only because creation of some definitely
+    /// empty modules is skipped as an optimization.
+    Block(Option<Module<'ra>>),
+
     /// We passed through an impl or trait and are now in one of its
     /// methods or associated types. Allow references to ty params that impl or trait
     /// binds. Disallow any other upvars (including other ty params that are
@@ -211,7 +218,7 @@ pub(crate) enum RibKind<'ra> {
     /// All other constants aren't allowed to use generic params at all.
     ConstantItem(ConstantHasGenerics, Option<(Ident, ConstantItemKind)>),
 
-    /// We passed through a module.
+    /// We passed through a module item.
     Module(Module<'ra>),
 
     /// We passed through a `macro_rules!` statement
@@ -243,6 +250,7 @@ impl RibKind<'_> {
     pub(crate) fn contains_params(&self) -> bool {
         match self {
             RibKind::Normal
+            | RibKind::Block(..)
             | RibKind::FnOrCoroutine
             | RibKind::ConstantItem(..)
             | RibKind::Module(_)
@@ -259,15 +267,8 @@ impl RibKind<'_> {
     fn is_label_barrier(self) -> bool {
         match self {
             RibKind::Normal | RibKind::MacroDefinition(..) => false,
-
-            RibKind::AssocItem
-            | RibKind::FnOrCoroutine
-            | RibKind::Item(..)
-            | RibKind::ConstantItem(..)
-            | RibKind::Module(..)
-            | RibKind::ForwardGenericParamBan(_)
-            | RibKind::ConstParamTy
-            | RibKind::InlineAsmSym => true,
+            RibKind::FnOrCoroutine | RibKind::ConstantItem(..) => true,
+            kind => bug!("unexpected rib kind: {kind:?}"),
         }
     }
 }
@@ -2820,9 +2821,9 @@ impl<'a, 'ast, 'ra, 'tcx> LateResolutionVisitor<'a, 'ast, 'ra, 'tcx> {
             // We also can't shadow bindings from associated parent items.
             for ns in [ValueNS, TypeNS] {
                 for parent_rib in self.ribs[ns].iter().rev() {
-                    // Break at mod level, to account for nested items which are
+                    // Break at module or block level, to account for nested items which are
                     // allowed to shadow generic param names.
-                    if matches!(parent_rib.kind, RibKind::Module(..)) {
+                    if matches!(parent_rib.kind, RibKind::Module(..) | RibKind::Block(..)) {
                         break;
                     }
 
@@ -4663,16 +4664,16 @@ impl<'a, 'ast, 'ra, 'tcx> LateResolutionVisitor<'a, 'ast, 'ra, 'tcx> {
         debug!("(resolving block) entering block");
         // Move down in the graph, if there's an anonymous module rooted here.
         let orig_module = self.parent_scope.module;
-        let anonymous_module = self.r.block_map.get(&block.id).cloned(); // clones a reference
+        let anonymous_module = self.r.block_map.get(&block.id).copied();
 
         let mut num_macro_definition_ribs = 0;
         if let Some(anonymous_module) = anonymous_module {
             debug!("(resolving block) found anonymous module, moving down");
-            self.ribs[ValueNS].push(Rib::new(RibKind::Module(anonymous_module)));
-            self.ribs[TypeNS].push(Rib::new(RibKind::Module(anonymous_module)));
+            self.ribs[ValueNS].push(Rib::new(RibKind::Block(Some(anonymous_module))));
+            self.ribs[TypeNS].push(Rib::new(RibKind::Block(Some(anonymous_module))));
             self.parent_scope.module = anonymous_module;
         } else {
-            self.ribs[ValueNS].push(Rib::new(RibKind::Normal));
+            self.ribs[ValueNS].push(Rib::new(RibKind::Block(None)));
         }
 
         // Descend into the block.

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -851,9 +851,7 @@ impl<'ast, 'ra, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
         }
 
         // Try to find in last block rib
-        if let Some(rib) = &self.last_block_rib
-            && let RibKind::Normal = rib.kind
-        {
+        if let Some(rib) = &self.last_block_rib {
             for (ident, &res) in &rib.bindings {
                 if let Res::Local(_) = res
                     && path.len() == 1
@@ -902,7 +900,7 @@ impl<'ast, 'ra, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
         if path.len() == 1 {
             for rib in self.ribs[ns].iter().rev() {
                 let item = path[0].ident;
-                if let RibKind::Module(module) = rib.kind
+                if let RibKind::Module(module) | RibKind::Block(Some(module)) = rib.kind
                     && let Some(did) = find_doc_alias_name(self.r, module, item.name)
                 {
                     return Some((did, item));
@@ -2470,7 +2468,7 @@ impl<'ast, 'ra, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
                 }
 
                 // Items in scope
-                if let RibKind::Module(module) = rib.kind {
+                if let RibKind::Module(module) | RibKind::Block(Some(module)) = rib.kind {
                     // Items from this module
                     self.r.add_module_candidates(module, &mut names, &filter_fn, Some(ctxt));