resolve: Split Scope::Module into two scopes for non-glob and glob bindings

compiler/rustc_middle/src/metadata.rs

@@ -45,16 +45,9 @@ pub struct ModChild {
     pub reexport_chain: SmallVec<[Reexport; 2]>,
 }
 
-#[derive(Debug, TyEncodable, TyDecodable, HashStable)]
-pub enum AmbigModChildKind {
-    GlobVsGlob,
-    GlobVsExpanded,
-}
-
 /// Same as `ModChild`, however, it includes ambiguity error.
 #[derive(Debug, TyEncodable, TyDecodable, HashStable)]
 pub struct AmbigModChild {
     pub main: ModChild,
     pub second: ModChild,
-    pub kind: AmbigModChildKind,
 }

compiler/rustc_resolve/src/build_reduced_graph.rs

@@ -22,7 +22,7 @@ use rustc_hir::def::{self, *};
 use rustc_hir::def_id::{CRATE_DEF_ID, DefId, LocalDefId};
 use rustc_index::bit_set::DenseBitSet;
 use rustc_metadata::creader::LoadedMacro;
-use rustc_middle::metadata::{AmbigModChildKind, ModChild, Reexport};
+use rustc_middle::metadata::{ModChild, Reexport};
 use rustc_middle::ty::{Feed, Visibility};
 use rustc_middle::{bug, span_bug};
 use rustc_span::hygiene::{ExpnId, LocalExpnId, MacroKind};
@@ -36,9 +36,9 @@ use crate::imports::{ImportData, ImportKind};
 use crate::macros::{MacroRulesBinding, MacroRulesScope, MacroRulesScopeRef};
 use crate::ref_mut::CmCell;
 use crate::{
-    AmbiguityKind, BindingKey, ExternPreludeEntry, Finalize, MacroData, Module, ModuleKind,
-    ModuleOrUniformRoot, NameBinding, NameBindingData, NameBindingKind, ParentScope, PathResult,
-    ResolutionError, Resolver, Segment, Used, VisResolutionError, errors,
+    BindingKey, ExternPreludeEntry, Finalize, MacroData, Module, ModuleKind, ModuleOrUniformRoot,
+    NameBinding, NameBindingData, NameBindingKind, ParentScope, PathResult, ResolutionError,
+    Resolver, Segment, Used, VisResolutionError, errors,
 };
 
 type Res = def::Res<NodeId>;
@@ -82,7 +82,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
         vis: Visibility<DefId>,
         span: Span,
         expansion: LocalExpnId,
-        ambiguity: Option<(NameBinding<'ra>, AmbiguityKind)>,
+        ambiguity: Option<NameBinding<'ra>>,
     ) {
         let binding = self.arenas.alloc_name_binding(NameBindingData {
             kind: NameBindingKind::Res(res),
@@ -254,7 +254,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                 &child.main,
                 parent_scope,
                 children.len() + i,
-                Some((&child.second, child.kind)),
+                Some(&child.second),
             )
         }
     }
@@ -265,7 +265,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
         child: &ModChild,
         parent_scope: ParentScope<'ra>,
         child_index: usize,
-        ambig_child: Option<(&ModChild, AmbigModChildKind)>,
+        ambig_child: Option<&ModChild>,
     ) {
         let parent = parent_scope.module;
         let child_span = |this: &Self, reexport_chain: &[Reexport], res: def::Res<_>| {
@@ -280,15 +280,11 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
         let span = child_span(self, reexport_chain, res);
         let res = res.expect_non_local();
         let expansion = parent_scope.expansion;
-        let ambig = ambig_child.map(|(ambig_child, ambig_kind)| {
+        let ambig = ambig_child.map(|ambig_child| {
             let ModChild { ident: _, res, vis, ref reexport_chain } = *ambig_child;
             let span = child_span(self, reexport_chain, res);
             let res = res.expect_non_local();
-            let ambig_kind = match ambig_kind {
-                AmbigModChildKind::GlobVsGlob => AmbiguityKind::GlobVsGlob,
-                AmbigModChildKind::GlobVsExpanded => AmbiguityKind::GlobVsExpanded,
-            };
-            (self.arenas.new_res_binding(res, vis, span, expansion), ambig_kind)
+            self.arenas.new_res_binding(res, vis, span, expansion)
         });
 
         // Record primary definitions.

compiler/rustc_resolve/src/diagnostics.rs

@@ -1206,9 +1206,12 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                         }
                     }
                 }
-                Scope::Module(module, _) => {
+                Scope::ModuleNonGlobs(module, _) => {
                     this.add_module_candidates(module, suggestions, filter_fn, None);
                 }
+                Scope::ModuleGlobs(..) => {
+                    // Already handled in `ModuleNonGlobs`.
+                }
                 Scope::MacroUsePrelude => {
                     suggestions.extend(this.macro_use_prelude.iter().filter_map(
                         |(name, binding)| {
@@ -2033,7 +2036,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                 help_msgs.push(format!("use `::{ident}` to refer to this {thing} unambiguously"))
             }
 
-            if let Scope::Module(module, _) = scope {
+            if let Scope::ModuleNonGlobs(module, _) | Scope::ModuleGlobs(module, _) = scope {
                 if module == self.graph_root {
                     help_msgs.push(format!(
                         "use `crate::{ident}` to refer to this {thing} unambiguously"