Remove some resolver outputs.

compiler/rustc_middle/src/query/mod.rs

@@ -1830,9 +1830,6 @@ rustc_queries! {
     query maybe_unused_trait_imports(_: ()) -> &'tcx FxIndexSet<LocalDefId> {
         desc { "fetching potentially unused trait imports" }
     }
-    query maybe_unused_extern_crates(_: ()) -> &'tcx [(LocalDefId, Span)] {
-        desc { "looking up all possibly unused extern crates" }
-    }
     query names_imported_by_glob_use(def_id: LocalDefId) -> &'tcx FxHashSet<Symbol> {
         desc { |tcx| "finding names imported by glob use for `{}`", tcx.def_path_str(def_id.to_def_id()) }
     }

compiler/rustc_middle/src/ty/context.rs

@@ -2504,8 +2504,6 @@ pub fn provide(providers: &mut ty::query::Providers) {
         |tcx, id| tcx.resolutions(()).reexport_map.get(&id).map(|v| &v[..]);
     providers.maybe_unused_trait_imports =
         |tcx, ()| &tcx.resolutions(()).maybe_unused_trait_imports;
-    providers.maybe_unused_extern_crates =
-        |tcx, ()| &tcx.resolutions(()).maybe_unused_extern_crates[..];
     providers.names_imported_by_glob_use = |tcx, id| {
         tcx.arena.alloc(tcx.resolutions(()).glob_map.get(&id).cloned().unwrap_or_default())
     };

compiler/rustc_middle/src/ty/mod.rs

@@ -168,12 +168,8 @@ pub struct ResolverGlobalCtxt {
     pub effective_visibilities: EffectiveVisibilities,
     pub extern_crate_map: FxHashMap<LocalDefId, CrateNum>,
     pub maybe_unused_trait_imports: FxIndexSet<LocalDefId>,
-    pub maybe_unused_extern_crates: Vec<(LocalDefId, Span)>,
     pub reexport_map: FxHashMap<LocalDefId, Vec<ModChild>>,
     pub glob_map: FxHashMap<LocalDefId, FxHashSet<Symbol>>,
-    /// Extern prelude entries. The value is `true` if the entry was introduced
-    /// via `extern crate` item and not `--extern` option or compiler built-in.
-    pub extern_prelude: FxHashMap<Symbol, bool>,
     pub main_def: Option<MainDefinition>,
     pub trait_impls: FxIndexMap<DefId, Vec<LocalDefId>>,
     /// A list of proc macro LocalDefIds, written out in the order in which

compiler/rustc_resolve/src/check_unused.rs

@@ -278,7 +278,6 @@ impl Resolver<'_, '_> {
                 }
                 ImportKind::ExternCrate { id, .. } => {
                     let def_id = self.local_def_id(id);
-                    self.maybe_unused_extern_crates.push((def_id, import.span));
                     if self.extern_crate_map.get(&def_id).map_or(true, |&cnum| {
                         !tcx.is_compiler_builtins(cnum)
                             && !tcx.is_panic_runtime(cnum)

compiler/rustc_resolve/src/lib.rs

@@ -946,7 +946,6 @@ pub struct Resolver<'a, 'tcx> {
     has_pub_restricted: bool,
     used_imports: FxHashSet<NodeId>,
     maybe_unused_trait_imports: FxIndexSet<LocalDefId>,
-    maybe_unused_extern_crates: Vec<(LocalDefId, Span)>,
 
     /// Privacy errors are delayed until the end in order to deduplicate them.
     privacy_errors: Vec<PrivacyError<'a>>,
@@ -1284,7 +1283,6 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             has_pub_restricted: false,
             used_imports: FxHashSet::default(),
             maybe_unused_trait_imports: Default::default(),
-            maybe_unused_extern_crates: Vec::new(),
 
             privacy_errors: Vec::new(),
             ambiguity_errors: Vec::new(),
@@ -1400,7 +1398,6 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
         let extern_crate_map = self.extern_crate_map;
         let reexport_map = self.reexport_map;
         let maybe_unused_trait_imports = self.maybe_unused_trait_imports;
-        let maybe_unused_extern_crates = self.maybe_unused_extern_crates;
         let glob_map = self.glob_map;
         let main_def = self.main_def;
         let confused_type_with_std_module = self.confused_type_with_std_module;
@@ -1414,12 +1411,6 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             reexport_map,
             glob_map,
             maybe_unused_trait_imports,
-            maybe_unused_extern_crates,
-            extern_prelude: self
-                .extern_prelude
-                .iter()
-                .map(|(ident, entry)| (ident.name, entry.introduced_by_item))
-                .collect(),
             main_def,
             trait_impls: self.trait_impls,
             proc_macros,