Add warn(unreachable_pub) to rustc_lint.

Author: nnethercote

compiler/rustc_lint/src/early.rs

@@ -413,7 +413,7 @@ pub fn check_ast_node<'a>(
     }
 }
 
-pub fn check_ast_node_inner<'a, T: EarlyLintPass>(
+fn check_ast_node_inner<'a, T: EarlyLintPass>(
     sess: &Session,
     check_node: impl EarlyCheckNode<'a>,
     context: EarlyContext<'_>,

compiler/rustc_lint/src/errors.rs

@@ -8,7 +8,7 @@ use crate::fluent_generated as fluent;
 
 #[derive(Diagnostic)]
 #[diag(lint_overruled_attribute, code = E0453)]
-pub struct OverruledAttribute<'a> {
+pub(crate) struct OverruledAttribute<'a> {
     #[primary_span]
     pub span: Span,
     #[label]
@@ -19,7 +19,7 @@ pub struct OverruledAttribute<'a> {
     pub sub: OverruledAttributeSub,
 }
 
-pub enum OverruledAttributeSub {
+pub(crate) enum OverruledAttributeSub {
     DefaultSource { id: String },
     NodeSource { span: Span, reason: Option<Symbol> },
     CommandLineSource,
@@ -52,15 +52,15 @@ impl Subdiagnostic for OverruledAttributeSub {
 
 #[derive(Diagnostic)]
 #[diag(lint_malformed_attribute, code = E0452)]
-pub struct MalformedAttribute {
+pub(crate) struct MalformedAttribute {
     #[primary_span]
     pub span: Span,
     #[subdiagnostic]
     pub sub: MalformedAttributeSub,
 }
 
 #[derive(Subdiagnostic)]
-pub enum MalformedAttributeSub {
+pub(crate) enum MalformedAttributeSub {
     #[label(lint_bad_attribute_argument)]
     BadAttributeArgument(#[primary_span] Span),
     #[label(lint_reason_must_be_string_literal)]
@@ -71,7 +71,7 @@ pub enum MalformedAttributeSub {
 
 #[derive(Diagnostic)]
 #[diag(lint_unknown_tool_in_scoped_lint, code = E0710)]
-pub struct UnknownToolInScopedLint {
+pub(crate) struct UnknownToolInScopedLint {
     #[primary_span]
     pub span: Option<Span>,
     pub tool_name: Symbol,
@@ -82,7 +82,7 @@ pub struct UnknownToolInScopedLint {
 
 #[derive(Diagnostic)]
 #[diag(lint_builtin_ellipsis_inclusive_range_patterns, code = E0783)]
-pub struct BuiltinEllipsisInclusiveRangePatterns {
+pub(crate) struct BuiltinEllipsisInclusiveRangePatterns {
     #[primary_span]
     pub span: Span,
     #[suggestion(style = "short", code = "{replace}", applicability = "machine-applicable")]
@@ -92,20 +92,20 @@ pub struct BuiltinEllipsisInclusiveRangePatterns {
 
 #[derive(Subdiagnostic)]
 #[note(lint_requested_level)]
-pub struct RequestedLevel<'a> {
+pub(crate) struct RequestedLevel<'a> {
     pub level: Level,
     pub lint_name: &'a str,
 }
 
 #[derive(Diagnostic)]
 #[diag(lint_unsupported_group, code = E0602)]
-pub struct UnsupportedGroup {
+pub(crate) struct UnsupportedGroup {
     pub lint_group: String,
 }
 
 #[derive(Diagnostic)]
 #[diag(lint_check_name_unknown_tool, code = E0602)]
-pub struct CheckNameUnknownTool<'a> {
+pub(crate) struct CheckNameUnknownTool<'a> {
     pub tool_name: Symbol,
     #[subdiagnostic]
     pub sub: RequestedLevel<'a>,

compiler/rustc_lint/src/late.rs

@@ -47,7 +47,7 @@ macro_rules! lint_callback { ($cx:expr, $f:ident, $($args:expr),*) => ({
 
 /// Implements the AST traversal for late lint passes. `T` provides the
 /// `check_*` methods.
-pub struct LateContextAndPass<'tcx, T: LateLintPass<'tcx>> {
+struct LateContextAndPass<'tcx, T: LateLintPass<'tcx>> {
     context: LateContext<'tcx>,
     pass: T,
 }

compiler/rustc_lint/src/levels.rs

@@ -1103,7 +1103,7 @@ pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers { shallow_lint_levels_on, lint_expectations, ..*providers };
 }
 
-pub fn parse_lint_and_tool_name(lint_name: &str) -> (Option<Symbol>, &str) {
+pub(crate) fn parse_lint_and_tool_name(lint_name: &str) -> (Option<Symbol>, &str) {
     match lint_name.split_once("::") {
         Some((tool_name, lint_name)) => {
             let tool_name = Symbol::intern(tool_name);

compiler/rustc_lint/src/lib.rs

@@ -39,6 +39,7 @@
 #![feature(rustc_attrs)]
 #![feature(rustdoc_internals)]
 #![feature(trait_upcasting)]
+#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 mod async_closures;