Move the unused extern crate check back to the resolver.

compiler/rustc_hir_analysis/src/check_unused.rs

@@ -1,12 +1,8 @@
-use crate::errors::{ExternCrateNotIdiomatic, UnusedExternCrate};
-use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::unord::UnordSet;
-use rustc_hir as hir;
 use rustc_hir::def::DefKind;
-use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::def_id::LocalDefId;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::lint;
-use rustc_span::{Span, Symbol};
 
 pub fn check_crate(tcx: TyCtxt<'_>) {
     let mut used_trait_imports: UnordSet<LocalDefId> = Default::default();
@@ -43,131 +39,4 @@ pub fn check_crate(tcx: TyCtxt<'_>) {
             |lint| lint,
         );
     }
-
-    unused_crates_lint(tcx);
-}
-
-fn unused_crates_lint(tcx: TyCtxt<'_>) {
-    let lint = lint::builtin::UNUSED_EXTERN_CRATES;
-
-    // Collect first the crates that are completely unused. These we
-    // can always suggest removing (no matter which edition we are
-    // in).
-    let unused_extern_crates: FxHashMap<LocalDefId, Span> = tcx
-        .maybe_unused_extern_crates(())
-        .iter()
-        .filter(|&&(def_id, _)| {
-            tcx.extern_mod_stmt_cnum(def_id).map_or(true, |cnum| {
-                !tcx.is_compiler_builtins(cnum)
-                    && !tcx.is_panic_runtime(cnum)
-                    && !tcx.has_global_allocator(cnum)
-                    && !tcx.has_panic_handler(cnum)
-            })
-        })
-        .cloned()
-        .collect();
-
-    // Collect all the extern crates (in a reliable order).
-    let mut crates_to_lint = vec![];
-
-    for id in tcx.hir().items() {
-        if matches!(tcx.def_kind(id.owner_id), DefKind::ExternCrate) {
-            let item = tcx.hir().item(id);
-            if let hir::ItemKind::ExternCrate(orig_name) = item.kind {
-                crates_to_lint.push(ExternCrateToLint {
-                    def_id: item.owner_id.to_def_id(),
-                    span: item.span,
-                    orig_name,
-                    warn_if_unused: !item.ident.as_str().starts_with('_'),
-                });
-            }
-        }
-    }
-
-    let extern_prelude = &tcx.resolutions(()).extern_prelude;
-
-    for extern_crate in &crates_to_lint {
-        let def_id = extern_crate.def_id.expect_local();
-        let item = tcx.hir().expect_item(def_id);
-
-        // If the crate is fully unused, we suggest removing it altogether.
-        // We do this in any edition.
-        if extern_crate.warn_if_unused {
-            if let Some(&span) = unused_extern_crates.get(&def_id) {
-                // Removal suggestion span needs to include attributes (Issue #54400)
-                let id = tcx.hir().local_def_id_to_hir_id(def_id);
-                let span_with_attrs = tcx
-                    .hir()
-                    .attrs(id)
-                    .iter()
-                    .map(|attr| attr.span)
-                    .fold(span, |acc, attr_span| acc.to(attr_span));
-
-                tcx.emit_spanned_lint(lint, id, span, UnusedExternCrate { span: span_with_attrs });
-                continue;
-            }
-        }
-
-        // If we are not in Rust 2018 edition, then we don't make any further
-        // suggestions.
-        if !tcx.sess.rust_2018() {
-            continue;
-        }
-
-        // If the extern crate isn't in the extern prelude,
-        // there is no way it can be written as a `use`.
-        let orig_name = extern_crate.orig_name.unwrap_or(item.ident.name);
-        if !extern_prelude.get(&orig_name).map_or(false, |from_item| !from_item) {
-            continue;
-        }
-
-        // If the extern crate is renamed, then we cannot suggest replacing it with a use as this
-        // would not insert the new name into the prelude, where other imports in the crate may be
-        // expecting it.
-        if extern_crate.orig_name.is_some() {
-            continue;
-        }
-
-        let id = tcx.hir().local_def_id_to_hir_id(def_id);
-        // If the extern crate has any attributes, they may have funky
-        // semantics we can't faithfully represent using `use` (most
-        // notably `#[macro_use]`). Ignore it.
-        if !tcx.hir().attrs(id).is_empty() {
-            continue;
-        }
-
-        let base_replacement = match extern_crate.orig_name {
-            Some(orig_name) => format!("use {} as {};", orig_name, item.ident.name),
-            None => format!("use {};", item.ident.name),
-        };
-        let vis = tcx.sess.source_map().span_to_snippet(item.vis_span).unwrap_or_default();
-        let add_vis = |to| if vis.is_empty() { to } else { format!("{} {}", vis, to) };
-        tcx.emit_spanned_lint(
-            lint,
-            id,
-            extern_crate.span,
-            ExternCrateNotIdiomatic {
-                span: extern_crate.span,
-                msg_code: add_vis("use".to_string()),
-                suggestion_code: add_vis(base_replacement),
-            },
-        );
-    }
-}
-
-struct ExternCrateToLint {
-    /// `DefId` of the extern crate
-    def_id: DefId,
-
-    /// span from the item
-    span: Span,
-
-    /// if `Some`, then this is renamed (`extern crate orig_name as
-    /// crate_name`), and -- perhaps surprisingly -- this stores the
-    /// *original* name (`item.name` will contain the new name)
-    orig_name: Option<Symbol>,
-
-    /// if `false`, the original name started with `_`, so we shouldn't lint
-    /// about it going unused (but we should still emit idiom lints).
-    warn_if_unused: bool,
 }

compiler/rustc_hir_analysis/src/errors.rs

@@ -5,7 +5,7 @@ use rustc_errors::{
     error_code, Applicability, DiagnosticBuilder, ErrorGuaranteed, Handler, IntoDiagnostic,
     MultiSpan,
 };
-use rustc_macros::{Diagnostic, LintDiagnostic};
+use rustc_macros::Diagnostic;
 use rustc_middle::ty::Ty;
 use rustc_span::{symbol::Ident, Span, Symbol};
 
@@ -247,26 +247,6 @@ pub struct SubstsOnOverriddenImpl {
     pub span: Span,
 }
 
-#[derive(LintDiagnostic)]
-#[diag(hir_analysis_unused_extern_crate)]
-pub struct UnusedExternCrate {
-    #[suggestion(applicability = "machine-applicable", code = "")]
-    pub span: Span,
-}
-
-#[derive(LintDiagnostic)]
-#[diag(hir_analysis_extern_crate_not_idiomatic)]
-pub struct ExternCrateNotIdiomatic {
-    #[suggestion(
-        style = "short",
-        applicability = "machine-applicable",
-        code = "{suggestion_code}"
-    )]
-    pub span: Span,
-    pub msg_code: String,
-    pub suggestion_code: String,
-}
-
 #[derive(Diagnostic)]
 #[diag(hir_analysis_const_impl_for_non_const_trait)]
 pub struct ConstImplForNonConstTrait {

compiler/rustc_lint/src/context.rs

@@ -893,6 +893,23 @@ pub trait LintContext: Sized {
                 BuiltinLintDiagnostics::ByteSliceInPackedStructWithDerive => {
                     db.help("consider implementing the trait by hand, or remove the `packed` attribute");
                 }
+                BuiltinLintDiagnostics::UnusedExternCrate { removal_span }=> {
+                    db.span_suggestion(
+                        removal_span,
+                        "remove it",
+                        "",
+                        Applicability::MachineApplicable,
+                    );
+                }
+                BuiltinLintDiagnostics::ExternCrateNotIdiomatic { vis_span, ident_span }=> {
+                    let suggestion_span = vis_span.between(ident_span);
+                    db.span_suggestion_verbose(
+                        suggestion_span,
+                        "convert it to a `use`",
+                        if vis_span.is_empty() { "use " } else { " use " },
+                        Applicability::MachineApplicable,
+                    );
+                }
             }
             // Rewrap `db`, and pass control to the user.
             decorate(db)

compiler/rustc_lint_defs/src/lib.rs

@@ -522,6 +522,13 @@ pub enum BuiltinLintDiagnostics {
         is_formatting_arg: bool,
     },
     ByteSliceInPackedStructWithDerive,
+    UnusedExternCrate {
+        removal_span: Span,
+    },
+    ExternCrateNotIdiomatic {
+        vis_span: Span,
+        ident_span: Span,
+    },
 }
 
 /// Lints that are buffered up early on in the `Session` before the

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