Add warn(unreachable_pub) to rustc_ast_lowering.

compiler/rustc_ast_lowering/src/errors.rs

@@ -6,7 +6,7 @@ use rustc_span::{Span, Symbol};
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_generic_type_with_parentheses, code = E0214)]
-pub struct GenericTypeWithParentheses {
+pub(crate) struct GenericTypeWithParentheses {
     #[primary_span]
     #[label]
     pub span: Span,
@@ -16,7 +16,7 @@ pub struct GenericTypeWithParentheses {
 
 #[derive(Subdiagnostic)]
 #[multipart_suggestion(ast_lowering_use_angle_brackets, applicability = "maybe-incorrect")]
-pub struct UseAngleBrackets {
+pub(crate) struct UseAngleBrackets {
     #[suggestion_part(code = "<")]
     pub open_param: Span,
     #[suggestion_part(code = ">")]
@@ -26,7 +26,7 @@ pub struct UseAngleBrackets {
 #[derive(Diagnostic)]
 #[diag(ast_lowering_invalid_abi, code = E0703)]
 #[note]
-pub struct InvalidAbi {
+pub(crate) struct InvalidAbi {
     #[primary_span]
     #[label]
     pub span: Span,
@@ -38,7 +38,7 @@ pub struct InvalidAbi {
     pub suggestion: Option<InvalidAbiSuggestion>,
 }
 
-pub struct InvalidAbiReason(pub &'static str);
+pub(crate) struct InvalidAbiReason(pub &'static str);
 
 impl Subdiagnostic for InvalidAbiReason {
     fn add_to_diag_with<G: EmissionGuarantee, F: SubdiagMessageOp<G>>(
@@ -57,7 +57,7 @@ impl Subdiagnostic for InvalidAbiReason {
     code = "{suggestion}",
     applicability = "maybe-incorrect"
 )]
-pub struct InvalidAbiSuggestion {
+pub(crate) struct InvalidAbiSuggestion {
     #[primary_span]
     pub span: Span,
     pub suggestion: String,
@@ -65,7 +65,7 @@ pub struct InvalidAbiSuggestion {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_assoc_ty_parentheses)]
-pub struct AssocTyParentheses {
+pub(crate) struct AssocTyParentheses {
     #[primary_span]
     pub span: Span,
     #[subdiagnostic]
@@ -73,7 +73,7 @@ pub struct AssocTyParentheses {
 }
 
 #[derive(Subdiagnostic)]
-pub enum AssocTyParenthesesSub {
+pub(crate) enum AssocTyParenthesesSub {
     #[multipart_suggestion(ast_lowering_remove_parentheses)]
     Empty {
         #[suggestion_part(code = "")]
@@ -91,7 +91,7 @@ pub enum AssocTyParenthesesSub {
 #[derive(Diagnostic)]
 #[diag(ast_lowering_misplaced_impl_trait, code = E0562)]
 #[note]
-pub struct MisplacedImplTrait<'a> {
+pub(crate) struct MisplacedImplTrait<'a> {
     #[primary_span]
     pub span: Span,
     pub position: DiagArgFromDisplay<'a>,
@@ -99,7 +99,7 @@ pub struct MisplacedImplTrait<'a> {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_assoc_ty_binding_in_dyn)]
-pub struct MisplacedAssocTyBinding {
+pub(crate) struct MisplacedAssocTyBinding {
     #[primary_span]
     pub span: Span,
     #[suggestion(code = " = impl", applicability = "maybe-incorrect", style = "verbose")]
@@ -108,7 +108,7 @@ pub struct MisplacedAssocTyBinding {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_underscore_expr_lhs_assign)]
-pub struct UnderscoreExprLhsAssign {
+pub(crate) struct UnderscoreExprLhsAssign {
     #[primary_span]
     #[label]
     pub span: Span,
@@ -116,7 +116,7 @@ pub struct UnderscoreExprLhsAssign {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_base_expression_double_dot, code = E0797)]
-pub struct BaseExpressionDoubleDot {
+pub(crate) struct BaseExpressionDoubleDot {
     #[primary_span]
     #[suggestion(code = "/* expr */", applicability = "has-placeholders", style = "verbose")]
     pub span: Span,
@@ -124,7 +124,7 @@ pub struct BaseExpressionDoubleDot {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_await_only_in_async_fn_and_blocks, code = E0728)]
-pub struct AwaitOnlyInAsyncFnAndBlocks {
+pub(crate) struct AwaitOnlyInAsyncFnAndBlocks {
     #[primary_span]
     #[label]
     pub await_kw_span: Span,
@@ -134,21 +134,21 @@ pub struct AwaitOnlyInAsyncFnAndBlocks {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_coroutine_too_many_parameters, code = E0628)]
-pub struct CoroutineTooManyParameters {
+pub(crate) struct CoroutineTooManyParameters {
     #[primary_span]
     pub fn_decl_span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_closure_cannot_be_static, code = E0697)]
-pub struct ClosureCannotBeStatic {
+pub(crate) struct ClosureCannotBeStatic {
     #[primary_span]
     pub fn_decl_span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_functional_record_update_destructuring_assignment)]
-pub struct FunctionalRecordUpdateDestructuringAssignment {
+pub(crate) struct FunctionalRecordUpdateDestructuringAssignment {
     #[primary_span]
     #[suggestion(code = "", applicability = "machine-applicable")]
     pub span: Span,
@@ -156,28 +156,28 @@ pub struct FunctionalRecordUpdateDestructuringAssignment {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_async_coroutines_not_supported, code = E0727)]
-pub struct AsyncCoroutinesNotSupported {
+pub(crate) struct AsyncCoroutinesNotSupported {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_inline_asm_unsupported_target, code = E0472)]
-pub struct InlineAsmUnsupportedTarget {
+pub(crate) struct InlineAsmUnsupportedTarget {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_att_syntax_only_x86)]
-pub struct AttSyntaxOnlyX86 {
+pub(crate) struct AttSyntaxOnlyX86 {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_abi_specified_multiple_times)]
-pub struct AbiSpecifiedMultipleTimes {
+pub(crate) struct AbiSpecifiedMultipleTimes {
     #[primary_span]
     pub abi_span: Span,
     pub prev_name: Symbol,
@@ -189,7 +189,7 @@ pub struct AbiSpecifiedMultipleTimes {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_clobber_abi_not_supported)]
-pub struct ClobberAbiNotSupported {
+pub(crate) struct ClobberAbiNotSupported {
     #[primary_span]
     pub abi_span: Span,
 }
@@ -197,7 +197,7 @@ pub struct ClobberAbiNotSupported {
 #[derive(Diagnostic)]
 #[note]
 #[diag(ast_lowering_invalid_abi_clobber_abi)]
-pub struct InvalidAbiClobberAbi {
+pub(crate) struct InvalidAbiClobberAbi {
     #[primary_span]
     pub abi_span: Span,
     pub supported_abis: String,
@@ -205,7 +205,7 @@ pub struct InvalidAbiClobberAbi {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_invalid_register)]
-pub struct InvalidRegister<'a> {
+pub(crate) struct InvalidRegister<'a> {
     #[primary_span]
     pub op_span: Span,
     pub reg: Symbol,
@@ -214,7 +214,7 @@ pub struct InvalidRegister<'a> {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_invalid_register_class)]
-pub struct InvalidRegisterClass<'a> {
+pub(crate) struct InvalidRegisterClass<'a> {
     #[primary_span]
     pub op_span: Span,
     pub reg_class: Symbol,
@@ -223,7 +223,7 @@ pub struct InvalidRegisterClass<'a> {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_invalid_asm_template_modifier_reg_class)]
-pub struct InvalidAsmTemplateModifierRegClass {
+pub(crate) struct InvalidAsmTemplateModifierRegClass {
     #[primary_span]
     #[label(ast_lowering_template_modifier)]
     pub placeholder_span: Span,
@@ -234,7 +234,7 @@ pub struct InvalidAsmTemplateModifierRegClass {
 }
 
 #[derive(Subdiagnostic)]
-pub enum InvalidAsmTemplateModifierRegClassSub {
+pub(crate) enum InvalidAsmTemplateModifierRegClassSub {
     #[note(ast_lowering_support_modifiers)]
     SupportModifier { class_name: Symbol, modifiers: String },
     #[note(ast_lowering_does_not_support_modifiers)]
@@ -243,7 +243,7 @@ pub enum InvalidAsmTemplateModifierRegClassSub {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_invalid_asm_template_modifier_const)]
-pub struct InvalidAsmTemplateModifierConst {
+pub(crate) struct InvalidAsmTemplateModifierConst {
     #[primary_span]
     #[label(ast_lowering_template_modifier)]
     pub placeholder_span: Span,
@@ -253,7 +253,7 @@ pub struct InvalidAsmTemplateModifierConst {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_invalid_asm_template_modifier_sym)]
-pub struct InvalidAsmTemplateModifierSym {
+pub(crate) struct InvalidAsmTemplateModifierSym {
     #[primary_span]
     #[label(ast_lowering_template_modifier)]
     pub placeholder_span: Span,
@@ -263,7 +263,7 @@ pub struct InvalidAsmTemplateModifierSym {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_invalid_asm_template_modifier_label)]
-pub struct InvalidAsmTemplateModifierLabel {
+pub(crate) struct InvalidAsmTemplateModifierLabel {
     #[primary_span]
     #[label(ast_lowering_template_modifier)]
     pub placeholder_span: Span,
@@ -273,7 +273,7 @@ pub struct InvalidAsmTemplateModifierLabel {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_register_class_only_clobber)]
-pub struct RegisterClassOnlyClobber {
+pub(crate) struct RegisterClassOnlyClobber {
     #[primary_span]
     pub op_span: Span,
     pub reg_class_name: Symbol,
@@ -281,7 +281,7 @@ pub struct RegisterClassOnlyClobber {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_register_conflict)]
-pub struct RegisterConflict<'a> {
+pub(crate) struct RegisterConflict<'a> {
     #[primary_span]
     #[label(ast_lowering_register1)]
     pub op_span1: Span,
@@ -296,7 +296,7 @@ pub struct RegisterConflict<'a> {
 #[derive(Diagnostic)]
 #[help]
 #[diag(ast_lowering_sub_tuple_binding)]
-pub struct SubTupleBinding<'a> {
+pub(crate) struct SubTupleBinding<'a> {
     #[primary_span]
     #[label]
     #[suggestion(
@@ -313,7 +313,7 @@ pub struct SubTupleBinding<'a> {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_extra_double_dot)]
-pub struct ExtraDoubleDot<'a> {
+pub(crate) struct ExtraDoubleDot<'a> {
     #[primary_span]
     #[label]
     pub span: Span,
@@ -325,21 +325,21 @@ pub struct ExtraDoubleDot<'a> {
 #[derive(Diagnostic)]
 #[note]
 #[diag(ast_lowering_misplaced_double_dot)]
-pub struct MisplacedDoubleDot {
+pub(crate) struct MisplacedDoubleDot {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_misplaced_relax_trait_bound)]
-pub struct MisplacedRelaxTraitBound {
+pub(crate) struct MisplacedRelaxTraitBound {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_match_arm_with_no_body)]
-pub struct MatchArmWithNoBody {
+pub(crate) struct MatchArmWithNoBody {
     #[primary_span]
     pub span: Span,
     #[suggestion(code = " => todo!(),", applicability = "has-placeholders")]
@@ -348,7 +348,7 @@ pub struct MatchArmWithNoBody {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_never_pattern_with_body)]
-pub struct NeverPatternWithBody {
+pub(crate) struct NeverPatternWithBody {
     #[primary_span]
     #[label]
     #[suggestion(code = "", applicability = "maybe-incorrect")]
@@ -357,7 +357,7 @@ pub struct NeverPatternWithBody {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_never_pattern_with_guard)]
-pub struct NeverPatternWithGuard {
+pub(crate) struct NeverPatternWithGuard {
     #[primary_span]
     #[suggestion(code = "", applicability = "maybe-incorrect")]
     pub span: Span,
@@ -365,7 +365,7 @@ pub struct NeverPatternWithGuard {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_arbitrary_expression_in_pattern)]
-pub struct ArbitraryExpressionInPattern {
+pub(crate) struct ArbitraryExpressionInPattern {
     #[primary_span]
     pub span: Span,
     #[note(ast_lowering_pattern_from_macro_note)]
@@ -374,13 +374,13 @@ pub struct ArbitraryExpressionInPattern {
 
 #[derive(Diagnostic)]
 #[diag(ast_lowering_inclusive_range_with_no_end)]
-pub struct InclusiveRangeWithNoEnd {
+pub(crate) struct InclusiveRangeWithNoEnd {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
-pub enum BadReturnTypeNotation {
+pub(crate) enum BadReturnTypeNotation {
     #[diag(ast_lowering_bad_return_type_notation_inputs)]
     Inputs {
         #[primary_span]

compiler/rustc_ast_lowering/src/item.rs

@@ -1182,7 +1182,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
     /// into the body. This is to make sure that the future actually owns the
     /// arguments that are passed to the function, and to ensure things like
     /// drop order are stable.
-    pub fn lower_coroutine_body_with_moved_arguments(
+    pub(crate) fn lower_coroutine_body_with_moved_arguments(
         &mut self,
         decl: &FnDecl,
         lower_body: impl FnOnce(&mut LoweringContext<'_, 'hir>) -> hir::Expr<'hir>,

compiler/rustc_ast_lowering/src/lib.rs

@@ -37,6 +37,7 @@
 #![feature(box_patterns)]
 #![feature(let_chains)]
 #![feature(rustdoc_internals)]
+#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 use std::collections::hash_map::Entry;