Remove dead lint code.

Author: nnethercote

compiler/rustc_lint/src/context.rs

@@ -497,9 +497,6 @@ pub struct LateContext<'tcx> {
     /// Items accessible from the crate being checked.
     pub effective_visibilities: &'tcx EffectiveVisibilities,
 
-    /// The store of registered lints and the lint levels.
-    pub lint_store: &'tcx LintStore,
-
     pub last_node_with_lint_attrs: hir::HirId,
 
     /// Generic type parameters in scope for the item we are in.
@@ -515,21 +512,14 @@ pub struct EarlyContext<'a> {
     pub buffered: LintBuffer,
 }
 
-pub trait LintPassObject: Sized {}
-
-impl LintPassObject for EarlyLintPassObject {}
-
-impl LintPassObject for LateLintPassObject<'_> {}
-
-pub trait LintContext: Sized {
-    type PassObject: LintPassObject;
-
+pub trait LintContext {
     fn sess(&self) -> &Session;
-    fn lints(&self) -> &LintStore;
 
-    /// Emit a lint at the appropriate level, with an optional associated span and an existing diagnostic.
+    /// Emit a lint at the appropriate level, with an optional associated span and an existing
+    /// diagnostic.
     ///
-    /// Return value of the `decorate` closure is ignored, see [`struct_lint_level`] for a detailed explanation.
+    /// Return value of the `decorate` closure is ignored, see [`struct_lint_level`] for a detailed
+    /// explanation.
     ///
     /// [`struct_lint_level`]: rustc_middle::lint::struct_lint_level#decorate-signature
     #[rustc_lint_diagnostics]
@@ -1059,17 +1049,11 @@ impl<'a> EarlyContext<'a> {
 }
 
 impl<'tcx> LintContext for LateContext<'tcx> {
-    type PassObject = LateLintPassObject<'tcx>;
-
     /// Gets the overall compiler `Session` object.
     fn sess(&self) -> &Session {
         &self.tcx.sess
     }
 
-    fn lints(&self) -> &LintStore {
-        &*self.lint_store
-    }
-
     #[rustc_lint_diagnostics]
     fn lookup<S: Into<MultiSpan>>(
         &self,
@@ -1094,17 +1078,11 @@ impl<'tcx> LintContext for LateContext<'tcx> {
 }
 
 impl LintContext for EarlyContext<'_> {
-    type PassObject = EarlyLintPassObject;
-
     /// Gets the overall compiler `Session` object.
     fn sess(&self) -> &Session {
         &self.builder.sess()
     }
 
-    fn lints(&self) -> &LintStore {
-        self.builder.lint_store()
-    }
-
     #[rustc_lint_diagnostics]
     fn lookup<S: Into<MultiSpan>>(
         &self,

compiler/rustc_lint/src/late.rs

@@ -353,7 +353,6 @@ 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(()),
-        lint_store: unerased_lint_store(tcx),
         last_node_with_lint_attrs: tcx.hir().local_def_id_to_hir_id(module_def_id),
         generics: None,
         only_module: true,
@@ -412,7 +411,6 @@ fn late_lint_crate<'tcx>(tcx: TyCtxt<'tcx>) {
         cached_typeck_results: Cell::new(None),
         param_env: ty::ParamEnv::empty(),
         effective_visibilities: &tcx.effective_visibilities(()),
-        lint_store: unerased_lint_store(tcx),
         last_node_with_lint_attrs: hir::CRATE_HIR_ID,
         generics: None,
         only_module: false,

compiler/rustc_lint/src/levels.rs

@@ -548,10 +548,6 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
         self.features
     }
 
-    pub(crate) fn lint_store(&self) -> &LintStore {
-        self.store
-    }
-
     fn current_specs(&self) -> &FxHashMap<LintId, LevelAndSource> {
         self.provider.current_specs()
     }