Add warn(unreachable_pub) to rustc_hir_typeck.

compiler/rustc_hir_typeck/src/_match.rs

@@ -374,7 +374,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn maybe_get_coercion_reason(
+    pub(crate) fn maybe_get_coercion_reason(
         &self,
         hir_id: hir::HirId,
         sp: Span,
@@ -584,7 +584,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     // (e.g. we're in the tail of a function body)
     //
     // Returns the `LocalDefId` of the RPIT, which is always identity-substituted.
-    pub fn return_position_impl_trait_from_match_expectation(
+    pub(crate) fn return_position_impl_trait_from_match_expectation(
         &self,
         expectation: Expectation<'tcx>,
     ) -> Option<LocalDefId> {

compiler/rustc_hir_typeck/src/autoderef.rs

@@ -13,11 +13,11 @@ use super::method::MethodCallee;
 use super::{FnCtxt, PlaceOp};
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn autoderef(&'a self, span: Span, base_ty: Ty<'tcx>) -> Autoderef<'a, 'tcx> {
+    pub(crate) fn autoderef(&'a self, span: Span, base_ty: Ty<'tcx>) -> Autoderef<'a, 'tcx> {
         Autoderef::new(self, self.param_env, self.body_id, span, base_ty)
     }
 
-    pub fn try_overloaded_deref(
+    pub(crate) fn try_overloaded_deref(
         &self,
         span: Span,
         base_ty: Ty<'tcx>,
@@ -26,11 +26,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Returns the adjustment steps.
-    pub fn adjust_steps(&self, autoderef: &Autoderef<'a, 'tcx>) -> Vec<Adjustment<'tcx>> {
+    pub(crate) fn adjust_steps(&self, autoderef: &Autoderef<'a, 'tcx>) -> Vec<Adjustment<'tcx>> {
         self.register_infer_ok_obligations(self.adjust_steps_as_infer_ok(autoderef))
     }
 
-    pub fn adjust_steps_as_infer_ok(
+    pub(crate) fn adjust_steps_as_infer_ok(
         &self,
         autoderef: &Autoderef<'a, 'tcx>,
     ) -> InferOk<'tcx, Vec<Adjustment<'tcx>>> {

compiler/rustc_hir_typeck/src/callee.rs

@@ -29,7 +29,7 @@ use crate::errors;
 /// Checks that it is legal to call methods of the trait corresponding
 /// to `trait_id` (this only cares about the trait, not the specific
 /// method that is called).
-pub fn check_legal_trait_for_method_call(
+pub(crate) fn check_legal_trait_for_method_call(
     tcx: TyCtxt<'_>,
     span: Span,
     receiver: Option<Span>,
@@ -62,7 +62,7 @@ enum CallStep<'tcx> {
 }
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn check_call(
+    pub(crate) fn check_call(
         &self,
         call_expr: &'tcx hir::Expr<'tcx>,
         callee_expr: &'tcx hir::Expr<'tcx>,
@@ -940,7 +940,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 }
 
 #[derive(Debug)]
-pub struct DeferredCallResolution<'tcx> {
+pub(crate) struct DeferredCallResolution<'tcx> {
     call_expr: &'tcx hir::Expr<'tcx>,
     callee_expr: &'tcx hir::Expr<'tcx>,
     closure_ty: Ty<'tcx>,
@@ -949,7 +949,7 @@ pub struct DeferredCallResolution<'tcx> {
 }
 
 impl<'a, 'tcx> DeferredCallResolution<'tcx> {
-    pub fn resolve(self, fcx: &FnCtxt<'a, 'tcx>) {
+    pub(crate) fn resolve(self, fcx: &FnCtxt<'a, 'tcx>) {
         debug!("DeferredCallResolution::resolve() {:?}", self);
 
         // we should not be invoked until the closure kind has been

compiler/rustc_hir_typeck/src/coercion.rs

@@ -976,7 +976,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// adjusted type of the expression, if successful.
     /// Adjustments are only recorded if the coercion succeeded.
     /// The expressions *must not* have any preexisting adjustments.
-    pub fn coerce(
+    pub(crate) fn coerce(
         &self,
         expr: &hir::Expr<'_>,
         expr_ty: Ty<'tcx>,
@@ -1011,7 +1011,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     ///
     /// Returns false if the coercion creates any obligations that result in
     /// errors.
-    pub fn can_coerce(&self, expr_ty: Ty<'tcx>, target: Ty<'tcx>) -> bool {
+    pub(crate) fn can_coerce(&self, expr_ty: Ty<'tcx>, target: Ty<'tcx>) -> bool {
         // FIXME(-Znext-solver): We need to structurally resolve both types here.
         let source = self.resolve_vars_with_obligations(expr_ty);
         debug!("coercion::can_with_predicates({:?} -> {:?})", source, target);
@@ -1032,7 +1032,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// Given a type and a target type, this function will calculate and return
     /// how many dereference steps needed to achieve `expr_ty <: target`. If
     /// it's not possible, return `None`.
-    pub fn deref_steps(&self, expr_ty: Ty<'tcx>, target: Ty<'tcx>) -> Option<usize> {
+    pub(crate) fn deref_steps(&self, expr_ty: Ty<'tcx>, target: Ty<'tcx>) -> Option<usize> {
         let cause = self.cause(DUMMY_SP, ObligationCauseCode::ExprAssignable);
         // We don't ever need two-phase here since we throw out the result of the coercion
         let coerce = Coerce::new(self, cause, AllowTwoPhase::No);
@@ -1047,7 +1047,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// This function is for diagnostics only, since it does not register
     /// trait or region sub-obligations. (presumably we could, but it's not
     /// particularly important for diagnostics...)
-    pub fn deref_once_mutably_for_diagnostic(&self, expr_ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
+    pub(crate) fn deref_once_mutably_for_diagnostic(&self, expr_ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
         self.autoderef(DUMMY_SP, expr_ty).nth(1).and_then(|(deref_ty, _)| {
             self.infcx
                 .type_implements_trait(
@@ -1341,7 +1341,7 @@ pub fn can_coerce<'tcx>(
 /// }
 /// let final_ty = coerce.complete(fcx);
 /// ```
-pub struct CoerceMany<'tcx, 'exprs, E: AsCoercionSite> {
+pub(crate) struct CoerceMany<'tcx, 'exprs, E: AsCoercionSite> {
     expected_ty: Ty<'tcx>,
     final_ty: Option<Ty<'tcx>>,
     expressions: Expressions<'tcx, 'exprs, E>,
@@ -1350,7 +1350,7 @@ pub struct CoerceMany<'tcx, 'exprs, E: AsCoercionSite> {
 
 /// The type of a `CoerceMany` that is storing up the expressions into
 /// a buffer. We use this in `check/mod.rs` for things like `break`.
-pub type DynamicCoerceMany<'tcx> = CoerceMany<'tcx, 'tcx, &'tcx hir::Expr<'tcx>>;
+pub(crate) type DynamicCoerceMany<'tcx> = CoerceMany<'tcx, 'tcx, &'tcx hir::Expr<'tcx>>;
 
 enum Expressions<'tcx, 'exprs, E: AsCoercionSite> {
     Dynamic(Vec<&'tcx hir::Expr<'tcx>>),
@@ -1361,7 +1361,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
     /// The usual case; collect the set of expressions dynamically.
     /// If the full set of coercion sites is known before hand,
     /// consider `with_coercion_sites()` instead to avoid allocation.
-    pub fn new(expected_ty: Ty<'tcx>) -> Self {
+    pub(crate) fn new(expected_ty: Ty<'tcx>) -> Self {
         Self::make(expected_ty, Expressions::Dynamic(vec![]))
     }
 
@@ -1370,7 +1370,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
     /// expected to pass each element in the slice to `coerce(...)` in
     /// order. This is used with arrays in particular to avoid
     /// needlessly cloning the slice.
-    pub fn with_coercion_sites(expected_ty: Ty<'tcx>, coercion_sites: &'exprs [E]) -> Self {
+    pub(crate) fn with_coercion_sites(expected_ty: Ty<'tcx>, coercion_sites: &'exprs [E]) -> Self {
         Self::make(expected_ty, Expressions::UpFront(coercion_sites))
     }
 
@@ -1386,7 +1386,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
     /// Typically, this is used as the expected type when
     /// type-checking each of the alternative expressions whose types
     /// we are trying to merge.
-    pub fn expected_ty(&self) -> Ty<'tcx> {
+    pub(crate) fn expected_ty(&self) -> Ty<'tcx> {
         self.expected_ty
     }
 
@@ -1394,7 +1394,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
     /// at the LUB of the expressions we've seen so far (if any). This
     /// isn't *final* until you call `self.complete()`, which will return
     /// the merged type.
-    pub fn merged_ty(&self) -> Ty<'tcx> {
+    pub(crate) fn merged_ty(&self) -> Ty<'tcx> {
         self.final_ty.unwrap_or(self.expected_ty)
     }
 
@@ -1403,7 +1403,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
     /// could coerce from. This will record `expression`, and later
     /// calls to `coerce` may come back and add adjustments and things
     /// if necessary.
-    pub fn coerce<'a>(
+    pub(crate) fn coerce<'a>(
         &mut self,
         fcx: &FnCtxt<'a, 'tcx>,
         cause: &ObligationCause<'tcx>,
@@ -1425,7 +1425,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
     /// The `augment_error` gives you a chance to extend the error
     /// message, in case any results (e.g., we use this to suggest
     /// removing a `;`).
-    pub fn coerce_forced_unit<'a>(
+    pub(crate) fn coerce_forced_unit<'a>(
         &mut self,
         fcx: &FnCtxt<'a, 'tcx>,
         cause: &ObligationCause<'tcx>,
@@ -1920,7 +1920,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
         }
     }
 
-    pub fn complete<'a>(self, fcx: &FnCtxt<'a, 'tcx>) -> Ty<'tcx> {
+    pub(crate) fn complete<'a>(self, fcx: &FnCtxt<'a, 'tcx>) -> Ty<'tcx> {
         if let Some(final_ty) = self.final_ty {
             final_ty
         } else {
@@ -1934,7 +1934,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
 
 /// Something that can be converted into an expression to which we can
 /// apply a coercion.
-pub trait AsCoercionSite {
+pub(crate) trait AsCoercionSite {
     fn as_coercion_site(&self) -> &hir::Expr<'_>;
 }
 

compiler/rustc_hir_typeck/src/demand.rs

@@ -18,7 +18,7 @@ use super::method::probe;
 use crate::FnCtxt;
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn emit_type_mismatch_suggestions(
+    pub(crate) fn emit_type_mismatch_suggestions(
         &self,
         err: &mut Diag<'_>,
         expr: &hir::Expr<'tcx>,
@@ -70,7 +70,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn emit_coerce_suggestions(
+    pub(crate) fn emit_coerce_suggestions(
         &self,
         err: &mut Diag<'_>,
         expr: &hir::Expr<'tcx>,
@@ -165,13 +165,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     /// Requires that the two types unify, and prints an error message if
     /// they don't.
-    pub fn demand_suptype(&self, sp: Span, expected: Ty<'tcx>, actual: Ty<'tcx>) {
+    pub(crate) fn demand_suptype(&self, sp: Span, expected: Ty<'tcx>, actual: Ty<'tcx>) {
         if let Err(e) = self.demand_suptype_diag(sp, expected, actual) {
             e.emit();
         }
     }
 
-    pub fn demand_suptype_diag(
+    pub(crate) fn demand_suptype_diag(
         &'a self,
         sp: Span,
         expected: Ty<'tcx>,
@@ -193,13 +193,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             .map_err(|e| self.err_ctxt().report_mismatched_types(cause, expected, actual, e))
     }
 
-    pub fn demand_eqtype(&self, sp: Span, expected: Ty<'tcx>, actual: Ty<'tcx>) {
+    pub(crate) fn demand_eqtype(&self, sp: Span, expected: Ty<'tcx>, actual: Ty<'tcx>) {
         if let Err(err) = self.demand_eqtype_diag(sp, expected, actual) {
             err.emit();
         }
     }
 
-    pub fn demand_eqtype_diag(
+    pub(crate) fn demand_eqtype_diag(
         &'a self,
         sp: Span,
         expected: Ty<'tcx>,
@@ -208,7 +208,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.demand_eqtype_with_origin(&self.misc(sp), expected, actual)
     }
 
-    pub fn demand_eqtype_with_origin(
+    pub(crate) fn demand_eqtype_with_origin(
         &'a self,
         cause: &ObligationCause<'tcx>,
         expected: Ty<'tcx>,
@@ -220,7 +220,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             .map_err(|e| self.err_ctxt().report_mismatched_types(cause, expected, actual, e))
     }
 
-    pub fn demand_coerce(
+    pub(crate) fn demand_coerce(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         checked_ty: Ty<'tcx>,
@@ -279,7 +279,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     /// Notes the point at which a variable is constrained to some type incompatible
     /// with some expectation given by `source`.
-    pub fn note_source_of_type_mismatch_constraint(
+    pub(crate) fn note_source_of_type_mismatch_constraint(
         &self,
         err: &mut Diag<'_>,
         expr: &hir::Expr<'_>,
@@ -558,7 +558,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     // When encountering a type error on the value of a `break`, try to point at the reason for the
     // expected type.
-    pub fn annotate_loop_expected_due_to_inference(
+    pub(crate) fn annotate_loop_expected_due_to_inference(
         &self,
         err: &mut Diag<'_>,
         expr: &hir::Expr<'_>,
@@ -964,7 +964,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         );
     }
 
-    pub fn get_conversion_methods_for_diagnostic(
+    pub(crate) fn get_conversion_methods_for_diagnostic(
         &self,
         span: Span,
         expected: Ty<'tcx>,
@@ -1186,7 +1186,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 }
 
-pub enum TypeMismatchSource<'tcx> {
+pub(crate) enum TypeMismatchSource<'tcx> {
     /// Expected the binding to have the given type, but it was found to have
     /// a different type. Find out when that type first became incompatible.
     Ty(Ty<'tcx>),

compiler/rustc_hir_typeck/src/diverges.rs

@@ -8,7 +8,7 @@ use rustc_span::{Span, DUMMY_SP};
 /// as diverging), with some manual adjustments for control-flow
 /// primitives (approximating a CFG).
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
-pub enum Diverges {
+pub(crate) enum Diverges {
     /// Potentially unknown, some cases converge,
     /// others require a CFG to determine them.
     Maybe,

compiler/rustc_hir_typeck/src/errors.rs

@@ -17,7 +17,7 @@ use crate::fluent_generated as fluent;
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_field_multiply_specified_in_initializer, code = E0062)]
-pub struct FieldMultiplySpecifiedInInitializer {
+pub(crate) struct FieldMultiplySpecifiedInInitializer {
     #[primary_span]
     #[label]
     pub span: Span,
@@ -28,7 +28,7 @@ pub struct FieldMultiplySpecifiedInInitializer {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_return_stmt_outside_of_fn_body, code = E0572)]
-pub struct ReturnStmtOutsideOfFnBody {
+pub(crate) struct ReturnStmtOutsideOfFnBody {
     #[primary_span]
     pub span: Span,
     #[label(hir_typeck_encl_body_label)]
@@ -38,7 +38,7 @@ pub struct ReturnStmtOutsideOfFnBody {
     pub statement_kind: ReturnLikeStatementKind,
 }
 
-pub enum ReturnLikeStatementKind {
+pub(crate) enum ReturnLikeStatementKind {
     Return,
     Become,
 }
@@ -57,21 +57,21 @@ impl IntoDiagArg for ReturnLikeStatementKind {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_rustcall_incorrect_args)]
-pub struct RustCallIncorrectArgs {
+pub(crate) struct RustCallIncorrectArgs {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_yield_expr_outside_of_coroutine, code = E0627)]
-pub struct YieldExprOutsideOfCoroutine {
+pub(crate) struct YieldExprOutsideOfCoroutine {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_struct_expr_non_exhaustive, code = E0639)]
-pub struct StructExprNonExhaustive {
+pub(crate) struct StructExprNonExhaustive {
     #[primary_span]
     pub span: Span,
     pub what: &'static str,
@@ -79,21 +79,21 @@ pub struct StructExprNonExhaustive {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_functional_record_update_on_non_struct, code = E0436)]
-pub struct FunctionalRecordUpdateOnNonStruct {
+pub(crate) struct FunctionalRecordUpdateOnNonStruct {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_address_of_temporary_taken, code = E0745)]
-pub struct AddressOfTemporaryTaken {
+pub(crate) struct AddressOfTemporaryTaken {
     #[primary_span]
     #[label]
     pub span: Span,
 }
 
 #[derive(Subdiagnostic)]
-pub enum AddReturnTypeSuggestion {
+pub(crate) enum AddReturnTypeSuggestion {
     #[suggestion(
         hir_typeck_add_return_type_add,
         code = " -> {found}",
@@ -116,7 +116,7 @@ pub enum AddReturnTypeSuggestion {
 }
 
 #[derive(Subdiagnostic)]
-pub enum ExpectedReturnTypeLabel<'tcx> {
+pub(crate) enum ExpectedReturnTypeLabel<'tcx> {
     #[label(hir_typeck_expected_default_return_type)]
     Unit {
         #[primary_span]
@@ -132,7 +132,7 @@ pub enum ExpectedReturnTypeLabel<'tcx> {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_explicit_destructor, code = E0040)]
-pub struct ExplicitDestructorCall {
+pub(crate) struct ExplicitDestructorCall {
     #[primary_span]
     #[label]
     pub span: Span,
@@ -141,7 +141,7 @@ pub struct ExplicitDestructorCall {
 }
 
 #[derive(Subdiagnostic)]
-pub enum ExplicitDestructorCallSugg {
+pub(crate) enum ExplicitDestructorCallSugg {
     #[suggestion(hir_typeck_suggestion, code = "drop", applicability = "maybe-incorrect")]
     Empty(#[primary_span] Span),
     #[multipart_suggestion(hir_typeck_suggestion, style = "short")]
@@ -155,7 +155,7 @@ pub enum ExplicitDestructorCallSugg {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_missing_parentheses_in_range, code = E0689)]
-pub struct MissingParenthesesInRange {
+pub(crate) struct MissingParenthesesInRange {
     #[primary_span]
     #[label(hir_typeck_missing_parentheses_in_range)]
     pub span: Span,
@@ -166,7 +166,7 @@ pub struct MissingParenthesesInRange {
 }
 
 #[derive(LintDiagnostic)]
-pub enum NeverTypeFallbackFlowingIntoUnsafe {
+pub(crate) enum NeverTypeFallbackFlowingIntoUnsafe {
     #[help]
     #[diag(hir_typeck_never_type_fallback_flowing_into_unsafe_call)]
     Call,
@@ -187,7 +187,7 @@ pub enum NeverTypeFallbackFlowingIntoUnsafe {
 #[derive(LintDiagnostic)]
 #[help]
 #[diag(hir_typeck_dependency_on_unit_never_type_fallback)]
-pub struct DependencyOnUnitNeverTypeFallback<'tcx> {
+pub(crate) struct DependencyOnUnitNeverTypeFallback<'tcx> {
     #[note]
     pub obligation_span: Span,
     pub obligation: ty::Predicate<'tcx>,
@@ -199,7 +199,7 @@ pub struct DependencyOnUnitNeverTypeFallback<'tcx> {
     style = "verbose",
     applicability = "maybe-incorrect"
 )]
-pub struct AddMissingParenthesesInRange {
+pub(crate) struct AddMissingParenthesesInRange {
     pub func_name: String,
     #[suggestion_part(code = "(")]
     pub left: Span,
@@ -207,7 +207,7 @@ pub struct AddMissingParenthesesInRange {
     pub right: Span,
 }
 
-pub struct TypeMismatchFruTypo {
+pub(crate) struct TypeMismatchFruTypo {
     /// Span of the LHS of the range
     pub expr_span: Span,
     /// Span of the `..RHS` part of the range
@@ -246,7 +246,7 @@ impl Subdiagnostic for TypeMismatchFruTypo {
 #[derive(LintDiagnostic)]
 #[diag(hir_typeck_lossy_provenance_int2ptr)]
 #[help]
-pub struct LossyProvenanceInt2Ptr<'tcx> {
+pub(crate) struct LossyProvenanceInt2Ptr<'tcx> {
     pub expr_ty: Ty<'tcx>,
     pub cast_ty: Ty<'tcx>,
     #[subdiagnostic]
@@ -255,14 +255,14 @@ pub struct LossyProvenanceInt2Ptr<'tcx> {
 
 #[derive(LintDiagnostic)]
 #[diag(hir_typeck_ptr_cast_add_auto_to_object)]
-pub struct PtrCastAddAutoToObject {
+pub(crate) struct PtrCastAddAutoToObject {
     pub traits_len: usize,
     pub traits: DiagSymbolList<String>,
 }
 
 #[derive(Subdiagnostic)]
 #[multipart_suggestion(hir_typeck_suggestion, applicability = "has-placeholders")]
-pub struct LossyProvenanceInt2PtrSuggestion {
+pub(crate) struct LossyProvenanceInt2PtrSuggestion {
     #[suggestion_part(code = "(...).with_addr(")]
     pub lo: Span,
     #[suggestion_part(code = ")")]
@@ -272,7 +272,7 @@ pub struct LossyProvenanceInt2PtrSuggestion {
 #[derive(LintDiagnostic)]
 #[diag(hir_typeck_lossy_provenance_ptr2int)]
 #[help]
-pub struct LossyProvenancePtr2Int<'tcx> {
+pub(crate) struct LossyProvenancePtr2Int<'tcx> {
     pub expr_ty: Ty<'tcx>,
     pub cast_ty: Ty<'tcx>,
     #[subdiagnostic]
@@ -280,7 +280,7 @@ pub struct LossyProvenancePtr2Int<'tcx> {
 }
 
 #[derive(Subdiagnostic)]
-pub enum LossyProvenancePtr2IntSuggestion<'tcx> {
+pub(crate) enum LossyProvenancePtr2IntSuggestion<'tcx> {
     #[multipart_suggestion(hir_typeck_suggestion, applicability = "maybe-incorrect")]
     NeedsParensCast {
         #[suggestion_part(code = "(")]
@@ -314,7 +314,7 @@ pub enum LossyProvenancePtr2IntSuggestion<'tcx> {
 }
 
 #[derive(Subdiagnostic)]
-pub enum HelpUseLatestEdition {
+pub(crate) enum HelpUseLatestEdition {
     #[help(hir_typeck_help_set_edition_cargo)]
     #[note(hir_typeck_note_edition_guide)]
     Cargo { edition: Edition },
@@ -324,7 +324,7 @@ pub enum HelpUseLatestEdition {
 }
 
 impl HelpUseLatestEdition {
-    pub fn new() -> Self {
+    pub(crate) fn new() -> Self {
         let edition = LATEST_STABLE_EDITION;
         if rustc_session::utils::was_invoked_from_cargo() {
             Self::Cargo { edition }
@@ -336,7 +336,7 @@ impl HelpUseLatestEdition {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_invalid_callee, code = E0618)]
-pub struct InvalidCallee {
+pub(crate) struct InvalidCallee {
     #[primary_span]
     pub span: Span,
     pub ty: String,
@@ -344,7 +344,7 @@ pub struct InvalidCallee {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_int_to_fat, code = E0606)]
-pub struct IntToWide<'tcx> {
+pub(crate) struct IntToWide<'tcx> {
     #[primary_span]
     #[label(hir_typeck_int_to_fat_label)]
     pub span: Span,
@@ -357,7 +357,7 @@ pub struct IntToWide<'tcx> {
 }
 
 #[derive(Subdiagnostic)]
-pub enum OptionResultRefMismatch {
+pub(crate) enum OptionResultRefMismatch {
     #[suggestion(
         hir_typeck_option_result_copied,
         code = ".copied()",
@@ -396,7 +396,7 @@ pub enum OptionResultRefMismatch {
     // },
 }
 
-pub struct RemoveSemiForCoerce {
+pub(crate) struct RemoveSemiForCoerce {
     pub expr: Span,
     pub ret: Span,
     pub semi: Span,
@@ -426,7 +426,7 @@ impl Subdiagnostic for RemoveSemiForCoerce {
 #[derive(Diagnostic)]
 #[diag(hir_typeck_const_select_must_be_const)]
 #[help]
-pub struct ConstSelectMustBeConst {
+pub(crate) struct ConstSelectMustBeConst {
     #[primary_span]
     pub span: Span,
 }
@@ -435,7 +435,7 @@ pub struct ConstSelectMustBeConst {
 #[diag(hir_typeck_const_select_must_be_fn)]
 #[note]
 #[help]
-pub struct ConstSelectMustBeFn<'a> {
+pub(crate) struct ConstSelectMustBeFn<'a> {
     #[primary_span]
     pub span: Span,
     pub ty: Ty<'a>,
@@ -443,14 +443,14 @@ pub struct ConstSelectMustBeFn<'a> {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_union_pat_multiple_fields)]
-pub struct UnionPatMultipleFields {
+pub(crate) struct UnionPatMultipleFields {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_union_pat_dotdot)]
-pub struct UnionPatDotDot {
+pub(crate) struct UnionPatDotDot {
     #[primary_span]
     pub span: Span,
 }
@@ -461,7 +461,7 @@ pub struct UnionPatDotDot {
     applicability = "maybe-incorrect",
     style = "verbose"
 )]
-pub struct UseIsEmpty {
+pub(crate) struct UseIsEmpty {
     #[suggestion_part(code = "!")]
     pub lo: Span,
     #[suggestion_part(code = ".is_empty()")]
@@ -471,13 +471,13 @@ pub struct UseIsEmpty {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_arg_mismatch_indeterminate)]
-pub struct ArgMismatchIndeterminate {
+pub(crate) struct ArgMismatchIndeterminate {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Subdiagnostic)]
-pub enum SuggestBoxing {
+pub(crate) enum SuggestBoxing {
     #[note(hir_typeck_suggest_boxing_note)]
     #[multipart_suggestion(
         hir_typeck_suggest_boxing_when_appropriate,
@@ -511,7 +511,7 @@ pub enum SuggestBoxing {
     style = "verbose",
     code = "core::ptr::null_mut()"
 )]
-pub struct SuggestPtrNullMut {
+pub(crate) struct SuggestPtrNullMut {
     #[primary_span]
     pub span: Span,
 }
@@ -519,7 +519,7 @@ pub struct SuggestPtrNullMut {
 #[derive(LintDiagnostic)]
 #[diag(hir_typeck_trivial_cast)]
 #[help]
-pub struct TrivialCast<'tcx> {
+pub(crate) struct TrivialCast<'tcx> {
     pub numeric: bool,
     pub expr_ty: Ty<'tcx>,
     pub cast_ty: Ty<'tcx>,
@@ -527,7 +527,7 @@ pub struct TrivialCast<'tcx> {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_no_associated_item, code = E0599)]
-pub struct NoAssociatedItem {
+pub(crate) struct NoAssociatedItem {
     #[primary_span]
     pub span: Span,
     pub item_kind: &'static str,
@@ -539,7 +539,7 @@ pub struct NoAssociatedItem {
 
 #[derive(Subdiagnostic)]
 #[note(hir_typeck_candidate_trait_note)]
-pub struct CandidateTraitNote {
+pub(crate) struct CandidateTraitNote {
     #[primary_span]
     pub span: Span,
     pub trait_name: String,
@@ -549,7 +549,7 @@ pub struct CandidateTraitNote {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_cannot_cast_to_bool, code = E0054)]
-pub struct CannotCastToBool<'tcx> {
+pub(crate) struct CannotCastToBool<'tcx> {
     #[primary_span]
     pub span: Span,
     pub expr_ty: Ty<'tcx>,
@@ -559,14 +559,14 @@ pub struct CannotCastToBool<'tcx> {
 
 #[derive(LintDiagnostic)]
 #[diag(hir_typeck_cast_enum_drop)]
-pub struct CastEnumDrop<'tcx> {
+pub(crate) struct CastEnumDrop<'tcx> {
     pub expr_ty: Ty<'tcx>,
     pub cast_ty: Ty<'tcx>,
 }
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_cast_unknown_pointer, code = E0641)]
-pub struct CastUnknownPointer {
+pub(crate) struct CastUnknownPointer {
     #[primary_span]
     pub span: Span,
     pub to: bool,
@@ -574,7 +574,7 @@ pub struct CastUnknownPointer {
     pub sub: CastUnknownPointerSub,
 }
 
-pub enum CastUnknownPointerSub {
+pub(crate) enum CastUnknownPointerSub {
     To(Span),
     From(Span),
 }
@@ -601,7 +601,7 @@ impl rustc_errors::Subdiagnostic for CastUnknownPointerSub {
 }
 
 #[derive(Subdiagnostic)]
-pub enum CannotCastToBoolHelp {
+pub(crate) enum CannotCastToBoolHelp {
     #[suggestion(
         hir_typeck_suggestion,
         applicability = "machine-applicable",
@@ -615,7 +615,7 @@ pub enum CannotCastToBoolHelp {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_ctor_is_private, code = E0603)]
-pub struct CtorIsPrivate {
+pub(crate) struct CtorIsPrivate {
     #[primary_span]
     pub span: Span,
     pub def: String,
@@ -623,7 +623,7 @@ pub struct CtorIsPrivate {
 
 #[derive(Subdiagnostic)]
 #[note(hir_typeck_deref_is_empty)]
-pub struct DerefImplsIsEmpty {
+pub(crate) struct DerefImplsIsEmpty {
     #[primary_span]
     pub span: Span,
     pub deref_ty: String,
@@ -635,7 +635,7 @@ pub struct DerefImplsIsEmpty {
     applicability = "machine-applicable",
     style = "verbose"
 )]
-pub struct SuggestConvertViaMethod<'tcx> {
+pub(crate) struct SuggestConvertViaMethod<'tcx> {
     #[suggestion_part(code = "{sugg}")]
     pub span: Span,
     #[suggestion_part(code = "")]
@@ -647,13 +647,13 @@ pub struct SuggestConvertViaMethod<'tcx> {
 
 #[derive(Subdiagnostic)]
 #[note(hir_typeck_note_caller_chooses_ty_for_ty_param)]
-pub struct NoteCallerChoosesTyForTyParam<'tcx> {
+pub(crate) struct NoteCallerChoosesTyForTyParam<'tcx> {
     pub ty_param_name: Symbol,
     pub found_ty: Ty<'tcx>,
 }
 
 #[derive(Subdiagnostic)]
-pub enum SuggestBoxingForReturnImplTrait {
+pub(crate) enum SuggestBoxingForReturnImplTrait {
     #[multipart_suggestion(hir_typeck_rpit_change_return_type, applicability = "maybe-incorrect")]
     ChangeReturnType {
         #[suggestion_part(code = "Box<dyn")]
@@ -672,7 +672,7 @@ pub enum SuggestBoxingForReturnImplTrait {
 
 #[derive(Diagnostic)]
 #[diag(hir_typeck_self_ctor_from_outer_item, code = E0401)]
-pub struct SelfCtorFromOuterItem {
+pub(crate) struct SelfCtorFromOuterItem {
     #[primary_span]
     pub span: Span,
     #[label]
@@ -683,7 +683,7 @@ pub struct SelfCtorFromOuterItem {
 
 #[derive(LintDiagnostic)]
 #[diag(hir_typeck_self_ctor_from_outer_item)]
-pub struct SelfCtorFromOuterItemLint {
+pub(crate) struct SelfCtorFromOuterItemLint {
     #[label]
     pub impl_span: Span,
     #[subdiagnostic]
@@ -692,7 +692,7 @@ pub struct SelfCtorFromOuterItemLint {
 
 #[derive(Subdiagnostic)]
 #[suggestion(hir_typeck_suggestion, code = "{name}", applicability = "machine-applicable")]
-pub struct ReplaceWithName {
+pub(crate) struct ReplaceWithName {
     #[primary_span]
     pub span: Span,
     pub name: String,

compiler/rustc_hir_typeck/src/expectation.rs

@@ -7,7 +7,7 @@ use super::FnCtxt;
 /// When type-checking an expression, we propagate downward
 /// whatever type hint we are able in the form of an `Expectation`.
 #[derive(Copy, Clone, Debug)]
-pub enum Expectation<'tcx> {
+pub(crate) enum Expectation<'tcx> {
     /// We know nothing about what type this expression should have.
     NoExpectation,
 

compiler/rustc_hir_typeck/src/expr.rs

@@ -51,7 +51,7 @@ use crate::{
 };
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn check_expr_has_type_or_error(
+    pub(crate) fn check_expr_has_type_or_error(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         expected_ty: Ty<'tcx>,
@@ -977,7 +977,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Check if the expression that could not be assigned to was a typoed expression that
-    pub fn check_for_missing_semi(&self, expr: &'tcx hir::Expr<'tcx>, err: &mut Diag<'_>) -> bool {
+    pub(crate) fn check_for_missing_semi(
+        &self,
+        expr: &'tcx hir::Expr<'tcx>,
+        err: &mut Diag<'_>,
+    ) -> bool {
         if let hir::ExprKind::Binary(binop, lhs, rhs) = expr.kind
             && let hir::BinOpKind::Mul = binop.node
             && self.tcx.sess.source_map().is_multiline(lhs.span.between(rhs.span))

compiler/rustc_hir_typeck/src/fallback.rs

@@ -18,7 +18,7 @@ use rustc_trait_selection::traits::{ObligationCause, ObligationCtxt};
 use crate::{errors, FnCtxt, TypeckRootCtxt};
 
 #[derive(Copy, Clone)]
-pub enum DivergingFallbackBehavior {
+pub(crate) enum DivergingFallbackBehavior {
     /// Always fallback to `()` (aka "always spontaneous decay")
     ToUnit,
     /// Sometimes fallback to `!`, but mainly fallback to `()` so that most of the crates are not broken.

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -132,18 +132,18 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         deferred_call_resolutions.remove(&closure_def_id).unwrap_or_default()
     }
 
-    pub fn tag(&self) -> String {
+    fn tag(&self) -> String {
         format!("{self:p}")
     }
 
-    pub fn local_ty(&self, span: Span, nid: HirId) -> Ty<'tcx> {
+    pub(crate) fn local_ty(&self, span: Span, nid: HirId) -> Ty<'tcx> {
         self.locals.borrow().get(&nid).cloned().unwrap_or_else(|| {
             span_bug!(span, "no type for local variable {}", self.tcx.hir().node_to_string(nid))
         })
     }
 
     #[inline]
-    pub fn write_ty(&self, id: HirId, ty: Ty<'tcx>) {
+    pub(crate) fn write_ty(&self, id: HirId, ty: Ty<'tcx>) {
         debug!("write_ty({:?}, {:?}) in fcx {}", id, self.resolve_vars_if_possible(ty), self.tag());
         let mut typeck = self.typeck_results.borrow_mut();
         let mut node_ty = typeck.node_types_mut();
@@ -165,7 +165,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn write_field_index(
+    pub(crate) fn write_field_index(
         &self,
         hir_id: HirId,
         index: FieldIdx,
@@ -198,7 +198,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.write_args(hir_id, method.args);
     }
 
-    pub fn write_args(&self, node_id: HirId, args: GenericArgsRef<'tcx>) {
+    fn write_args(&self, node_id: HirId, args: GenericArgsRef<'tcx>) {
         if !args.is_empty() {
             debug!("write_args({:?}, {:?}) in fcx {}", node_id, args, self.tag());
 
@@ -364,7 +364,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         )
     }
 
-    pub fn require_type_meets(
+    pub(crate) fn require_type_meets(
         &self,
         ty: Ty<'tcx>,
         span: Span,
@@ -374,7 +374,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.register_bound(ty, def_id, traits::ObligationCause::new(span, self.body_id, code));
     }
 
-    pub fn require_type_is_sized(
+    pub(crate) fn require_type_is_sized(
         &self,
         ty: Ty<'tcx>,
         span: Span,
@@ -386,7 +386,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn require_type_is_sized_deferred(
+    pub(crate) fn require_type_is_sized_deferred(
         &self,
         ty: Ty<'tcx>,
         span: Span,
@@ -397,7 +397,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn require_type_has_static_alignment(
+    pub(crate) fn require_type_has_static_alignment(
         &self,
         ty: Ty<'tcx>,
         span: Span,
@@ -426,7 +426,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn register_bound(
+    pub(crate) fn register_bound(
         &self,
         ty: Ty<'tcx>,
         def_id: DefId,
@@ -443,7 +443,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn lower_ty(&self, hir_ty: &hir::Ty<'tcx>) -> LoweredTy<'tcx> {
+    pub(crate) fn lower_ty(&self, hir_ty: &hir::Ty<'tcx>) -> LoweredTy<'tcx> {
         let ty = self.lowerer().lower_ty(hir_ty);
         self.register_wf_obligation(ty.into(), hir_ty.span, ObligationCauseCode::WellFormed(None));
         LoweredTy::from_raw(self, hir_ty.span, ty)
@@ -474,7 +474,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn lower_array_length(&self, length: &hir::ArrayLen<'tcx>) -> ty::Const<'tcx> {
+    pub(crate) fn lower_array_length(&self, length: &hir::ArrayLen<'tcx>) -> ty::Const<'tcx> {
         match length {
             hir::ArrayLen::Infer(inf) => self.ct_infer(None, inf.span),
             hir::ArrayLen::Body(const_arg) => {
@@ -486,7 +486,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn lower_const_arg(
+    pub(crate) fn lower_const_arg(
         &self,
         const_arg: &'tcx hir::ConstArg<'tcx>,
         param_def_id: DefId,
@@ -515,7 +515,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         t.has_free_regions() || t.has_aliases() || t.has_infer_types()
     }
 
-    pub fn node_ty(&self, id: HirId) -> Ty<'tcx> {
+    pub(crate) fn node_ty(&self, id: HirId) -> Ty<'tcx> {
         match self.typeck_results.borrow().node_types().get(id) {
             Some(&t) => t,
             None if let Some(e) = self.tainted_by_errors() => Ty::new_error(self.tcx, e),
@@ -529,7 +529,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn node_ty_opt(&self, id: HirId) -> Option<Ty<'tcx>> {
+    pub(crate) fn node_ty_opt(&self, id: HirId) -> Option<Ty<'tcx>> {
         match self.typeck_results.borrow().node_types().get(id) {
             Some(&t) => Some(t),
             None if let Some(e) = self.tainted_by_errors() => Some(Ty::new_error(self.tcx, e)),
@@ -538,7 +538,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Registers an obligation for checking later, during regionck, that `arg` is well-formed.
-    pub fn register_wf_obligation(
+    pub(crate) fn register_wf_obligation(
         &self,
         arg: ty::GenericArg<'tcx>,
         span: Span,
@@ -555,7 +555,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Registers obligations that all `args` are well-formed.
-    pub fn add_wf_bounds(&self, args: GenericArgsRef<'tcx>, expr: &hir::Expr<'_>) {
+    pub(crate) fn add_wf_bounds(&self, args: GenericArgsRef<'tcx>, expr: &hir::Expr<'_>) {
         for arg in args.iter().filter(|arg| {
             matches!(arg.unpack(), GenericArgKind::Type(..) | GenericArgKind::Const(..))
         }) {
@@ -566,7 +566,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     // FIXME(arielb1): use this instead of field.ty everywhere
     // Only for fields! Returns <none> for methods>
     // Indifferent to privacy flags
-    pub fn field_ty(
+    pub(crate) fn field_ty(
         &self,
         span: Span,
         field: &'tcx ty::FieldDef,
@@ -897,7 +897,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     /// Given a `HirId`, return the `HirId` of the enclosing function, its `FnDecl`, and whether a
     /// suggestion can be made, `None` otherwise.
-    pub fn get_fn_decl(
+    pub(crate) fn get_fn_decl(
         &self,
         blk_id: HirId,
     ) -> Option<(LocalDefId, &'tcx hir::FnDecl<'tcx>, bool)> {
@@ -1534,7 +1534,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     ///
     /// If no resolution is possible, then an error is reported.
     /// Numeric inference variables may be left unresolved.
-    pub fn structurally_resolve_type(&self, sp: Span, ty: Ty<'tcx>) -> Ty<'tcx> {
+    pub(crate) fn structurally_resolve_type(&self, sp: Span, ty: Ty<'tcx>) -> Ty<'tcx> {
         let ty = self.try_structurally_resolve_type(sp, ty);
 
         if !ty.is_ty_var() {

compiler/rustc_hir_typeck/src/fn_ctxt/adjust_fulfillment_errors.rs

@@ -12,7 +12,7 @@ use rustc_trait_selection::traits;
 use crate::FnCtxt;
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn adjust_fulfillment_error_for_expr_obligation(
+    pub(crate) fn adjust_fulfillment_error_for_expr_obligation(
         &self,
         error: &mut traits::FulfillmentError<'tcx>,
     ) -> bool {
@@ -483,7 +483,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
      *
      * This function only updates the error span.
      */
-    pub fn blame_specific_expr_if_possible(
+    pub(crate) fn blame_specific_expr_if_possible(
         &self,
         error: &mut traits::FulfillmentError<'tcx>,
         expr: &'tcx hir::Expr<'tcx>,

compiler/rustc_hir_typeck/src/fn_ctxt/arg_matrix.rs

@@ -17,7 +17,7 @@ rustc_index::newtype_index! {
 }
 
 impl ExpectedIdx {
-    pub fn to_provided_idx(self) -> ProvidedIdx {
+    pub(crate) fn to_provided_idx(self) -> ProvidedIdx {
         ProvidedIdx::from_usize(self.as_usize())
     }
 }

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -45,7 +45,7 @@ use crate::{
 };
 
 #[derive(Clone, Copy, Default)]
-pub enum DivergingBlockBehavior {
+pub(crate) enum DivergingBlockBehavior {
     /// This is the current stable behavior:
     ///
     /// ```rust
@@ -1556,7 +1556,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn check_struct_path(
+    pub(crate) fn check_struct_path(
         &self,
         qpath: &QPath<'tcx>,
         hir_id: HirId,
@@ -1622,7 +1622,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn check_decl_initializer(
+    fn check_decl_initializer(
         &self,
         hir_id: HirId,
         pat: &'tcx hir::Pat<'tcx>,
@@ -1700,7 +1700,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Type check a `let` statement.
-    pub fn check_decl_local(&self, local: &'tcx hir::LetStmt<'tcx>) {
+    fn check_decl_local(&self, local: &'tcx hir::LetStmt<'tcx>) {
         self.check_decl(local.into());
         if local.pat.is_never_pattern() {
             self.diverges.set(Diverges::Always {
@@ -1710,7 +1710,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn check_stmt(&self, stmt: &'tcx hir::Stmt<'tcx>) {
+    fn check_stmt(&self, stmt: &'tcx hir::Stmt<'tcx>) {
         // Don't do all the complex logic below for `DeclItem`.
         match stmt.kind {
             hir::StmtKind::Item(..) => return,
@@ -1745,7 +1745,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.diverges.set(self.diverges.get() | old_diverges);
     }
 
-    pub fn check_block_no_value(&self, blk: &'tcx hir::Block<'tcx>) {
+    pub(crate) fn check_block_no_value(&self, blk: &'tcx hir::Block<'tcx>) {
         let unit = self.tcx.types.unit;
         let ty = self.check_block_with_expected(blk, ExpectHasType(unit));
 

compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs

@@ -117,7 +117,7 @@ pub(crate) struct FnCtxt<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn new(
+    pub(crate) fn new(
         root_ctxt: &'a TypeckRootCtxt<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
         body_id: LocalDefId,
@@ -148,15 +148,19 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.root_ctxt.infcx.dcx()
     }
 
-    pub fn cause(&self, span: Span, code: ObligationCauseCode<'tcx>) -> ObligationCause<'tcx> {
+    pub(crate) fn cause(
+        &self,
+        span: Span,
+        code: ObligationCauseCode<'tcx>,
+    ) -> ObligationCause<'tcx> {
         ObligationCause::new(span, self.body_id, code)
     }
 
-    pub fn misc(&self, span: Span) -> ObligationCause<'tcx> {
+    pub(crate) fn misc(&self, span: Span) -> ObligationCause<'tcx> {
         self.cause(span, ObligationCauseCode::Misc)
     }
 
-    pub fn sess(&self) -> &Session {
+    pub(crate) fn sess(&self) -> &Session {
         self.tcx.sess
     }
 
@@ -165,7 +169,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// Use [`InferCtxtErrorExt::err_ctxt`] to start one without a `TypeckResults`.
     ///
     /// [`InferCtxtErrorExt::err_ctxt`]: rustc_trait_selection::error_reporting::InferCtxtErrorExt::err_ctxt
-    pub fn err_ctxt(&'a self) -> TypeErrCtxt<'a, 'tcx> {
+    pub(crate) fn err_ctxt(&'a self) -> TypeErrCtxt<'a, 'tcx> {
         let mut sub_relations = SubRelations::default();
         sub_relations.add_constraints(
             self,
@@ -365,7 +369,7 @@ impl<'tcx> HirTyLowerer<'tcx> for FnCtxt<'_, 'tcx> {
 /// This is a bridge between the interface of HIR ty lowering, which outputs a raw
 /// `Ty`, and the API in this module, which expect `Ty` to be fully normalized.
 #[derive(Clone, Copy, Debug)]
-pub struct LoweredTy<'tcx> {
+pub(crate) struct LoweredTy<'tcx> {
     /// The unnormalized type provided by the user.
     pub raw: Ty<'tcx>,
 
@@ -374,7 +378,7 @@ pub struct LoweredTy<'tcx> {
 }
 
 impl<'tcx> LoweredTy<'tcx> {
-    pub fn from_raw(fcx: &FnCtxt<'_, 'tcx>, span: Span, raw: Ty<'tcx>) -> LoweredTy<'tcx> {
+    fn from_raw(fcx: &FnCtxt<'_, 'tcx>, span: Span, raw: Ty<'tcx>) -> LoweredTy<'tcx> {
         // FIXME(-Znext-solver): We're still figuring out how to best handle
         // normalization and this doesn't feel too great. We should look at this
         // code again before stabilizing it.

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -64,7 +64,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// - Points out the method's return type as the reason for the expected type.
     /// - Possible missing semicolon.
     /// - Possible missing return type if the return type is the default, and not `fn main()`.
-    pub fn suggest_mismatched_types_on_tail(
+    pub(crate) fn suggest_mismatched_types_on_tail(
         &self,
         err: &mut Diag<'_>,
         expr: &'tcx hir::Expr<'tcx>,
@@ -177,7 +177,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.err_ctxt().extract_callable_info(self.body_id, self.param_env, ty)
     }
 
-    pub fn suggest_two_fn_call(
+    pub(crate) fn suggest_two_fn_call(
         &self,
         err: &mut Diag<'_>,
         lhs_expr: &'tcx hir::Expr<'tcx>,
@@ -251,7 +251,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn suggest_remove_last_method_call(
+    pub(crate) fn suggest_remove_last_method_call(
         &self,
         err: &mut Diag<'_>,
         expr: &hir::Expr<'tcx>,
@@ -280,7 +280,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         false
     }
 
-    pub fn suggest_deref_ref_or_into(
+    pub(crate) fn suggest_deref_ref_or_into(
         &self,
         err: &mut Diag<'_>,
         expr: &hir::Expr<'tcx>,
@@ -747,7 +747,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     ///
     /// If the expression is the expression of a closure without block (`|| expr`), a
     /// block is needed to be added too (`|| { expr; }`). This is denoted by `needs_block`.
-    pub fn suggest_missing_semicolon(
+    pub(crate) fn suggest_missing_semicolon(
         &self,
         err: &mut Diag<'_>,
         expression: &'tcx hir::Expr<'tcx>,
@@ -2077,7 +2077,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     // If the expr is a while or for loop and is the tail expr of its
     // enclosing body suggest returning a value right after it
-    pub fn suggest_returning_value_after_loop(
+    pub(crate) fn suggest_returning_value_after_loop(
         &self,
         err: &mut Diag<'_>,
         expr: &hir::Expr<'tcx>,

compiler/rustc_hir_typeck/src/intrinsicck.rs

@@ -38,7 +38,7 @@ fn unpack_option_like<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
 }
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn check_transmute(&self, from: Ty<'tcx>, to: Ty<'tcx>, hir_id: HirId) {
+    pub(crate) fn check_transmute(&self, from: Ty<'tcx>, to: Ty<'tcx>, hir_id: HirId) {
         let tcx = self.tcx;
         let dl = &tcx.data_layout;
         let span = tcx.hir().span(hir_id);

compiler/rustc_hir_typeck/src/lib.rs

@@ -8,6 +8,7 @@
 #![feature(let_chains)]
 #![feature(never_type)]
 #![feature(try_blocks)]
+#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 #[macro_use]

compiler/rustc_hir_typeck/src/method/confirm.rs

@@ -42,13 +42,13 @@ impl<'a, 'tcx> Deref for ConfirmContext<'a, 'tcx> {
 }
 
 #[derive(Debug)]
-pub struct ConfirmResult<'tcx> {
+pub(crate) struct ConfirmResult<'tcx> {
     pub callee: MethodCallee<'tcx>,
     pub illegal_sized_bound: Option<Span>,
 }
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn confirm_method(
+    pub(crate) fn confirm_method(
         &self,
         span: Span,
         self_expr: &'tcx hir::Expr<'tcx>,
@@ -66,7 +66,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         confirm_cx.confirm(unadjusted_self_ty, pick, segment)
     }
 
-    pub fn confirm_method_for_diagnostic(
+    pub(crate) fn confirm_method_for_diagnostic(
         &self,
         span: Span,
         self_expr: &'tcx hir::Expr<'tcx>,

compiler/rustc_hir_typeck/src/method/mod.rs

@@ -4,7 +4,7 @@
 
 mod confirm;
 mod prelude_edition_lints;
-pub mod probe;
+pub(crate) mod probe;
 mod suggest;
 
 use rustc_errors::{Applicability, Diag, SubdiagMessage};
@@ -24,15 +24,15 @@ use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt;
 use rustc_trait_selection::traits::{self, NormalizeExt};
 
 use self::probe::{IsSuggestion, ProbeScope};
-pub use self::MethodError::*;
+pub(crate) use self::MethodError::*;
 use crate::FnCtxt;
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     probe::provide(providers);
 }
 
 #[derive(Clone, Copy, Debug)]
-pub struct MethodCallee<'tcx> {
+pub(crate) struct MethodCallee<'tcx> {
     /// Impl method ID, for inherent methods, or trait method ID, otherwise.
     pub def_id: DefId,
     pub args: GenericArgsRef<'tcx>,
@@ -44,7 +44,7 @@ pub struct MethodCallee<'tcx> {
 }
 
 #[derive(Debug)]
-pub enum MethodError<'tcx> {
+pub(crate) enum MethodError<'tcx> {
     // Did not find an applicable method, but we did find various near-misses that may work.
     NoMatch(NoMatchData<'tcx>),
 
@@ -70,7 +70,7 @@ pub enum MethodError<'tcx> {
 // Contains a list of static methods that may apply, a list of unsatisfied trait predicates which
 // could lead to matches if satisfied, and a list of not-in-scope traits which may work.
 #[derive(Debug)]
-pub struct NoMatchData<'tcx> {
+pub(crate) struct NoMatchData<'tcx> {
     pub static_candidates: Vec<CandidateSource>,
     pub unsatisfied_predicates:
         Vec<(ty::Predicate<'tcx>, Option<ty::Predicate<'tcx>>, Option<ObligationCause<'tcx>>)>,
@@ -82,7 +82,7 @@ pub struct NoMatchData<'tcx> {
 // A pared down enum describing just the places from which a method
 // candidate can arise. Used for error reporting only.
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
-pub enum CandidateSource {
+pub(crate) enum CandidateSource {
     Impl(DefId),
     Trait(DefId /* trait id */),
 }
@@ -254,7 +254,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         Ok(result.callee)
     }
 
-    pub fn lookup_method_for_diagnostic(
+    pub(crate) fn lookup_method_for_diagnostic(
         &self,
         self_ty: Ty<'tcx>,
         segment: &hir::PathSegment<'tcx>,
@@ -296,7 +296,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         Ok(pick)
     }
 
-    pub fn lookup_probe_for_diagnostic(
+    pub(crate) fn lookup_probe_for_diagnostic(
         &self,
         method_name: Ident,
         self_ty: Ty<'tcx>,
@@ -569,7 +569,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     /// Finds item with name `item_name` defined in impl/trait `def_id`
     /// and return it, or `None`, if no such item was defined there.
-    pub fn associated_value(&self, def_id: DefId, item_name: Ident) -> Option<ty::AssocItem> {
+    fn associated_value(&self, def_id: DefId, item_name: Ident) -> Option<ty::AssocItem> {
         self.tcx
             .associated_items(def_id)
             .find_by_name_and_namespace(self.tcx, item_name, Namespace::ValueNS, def_id)

compiler/rustc_hir_typeck/src/method/probe.rs

@@ -38,14 +38,14 @@ use rustc_trait_selection::traits::{self, ObligationCause, ObligationCtxt};
 use smallvec::{smallvec, SmallVec};
 
 use self::CandidateKind::*;
-pub use self::PickKind::*;
+pub(crate) use self::PickKind::*;
 use super::{suggest, CandidateSource, MethodError, NoMatchData};
 use crate::FnCtxt;
 
 /// Boolean flag used to indicate if this search is for a suggestion
 /// or not. If true, we can allow ambiguity and so forth.
 #[derive(Clone, Copy, Debug)]
-pub struct IsSuggestion(pub bool);
+pub(crate) struct IsSuggestion(pub bool);
 
 pub(crate) struct ProbeContext<'a, 'tcx> {
     fcx: &'a FnCtxt<'a, 'tcx>,
@@ -134,7 +134,7 @@ enum ProbeResult {
 /// (at most) one of these. Either the receiver has type `T` and we convert it to `&T` (or with
 /// `mut`), or it has type `*mut T` and we convert it to `*const T`.
 #[derive(Debug, PartialEq, Copy, Clone)]
-pub enum AutorefOrPtrAdjustment {
+pub(crate) enum AutorefOrPtrAdjustment {
     /// Receiver has type `T`, add `&` or `&mut` (it `T` is `mut`), and maybe also "unsize" it.
     /// Unsizing is used to convert a `[T; N]` to `[T]`, which only makes sense when autorefing.
     Autoref {
@@ -158,7 +158,7 @@ impl AutorefOrPtrAdjustment {
 }
 
 #[derive(Debug, Clone)]
-pub struct Pick<'tcx> {
+pub(crate) struct Pick<'tcx> {
     pub item: ty::AssocItem,
     pub kind: PickKind<'tcx>,
     pub import_ids: SmallVec<[LocalDefId; 1]>,
@@ -179,7 +179,7 @@ pub struct Pick<'tcx> {
 }
 
 #[derive(Clone, Debug, PartialEq, Eq)]
-pub enum PickKind<'tcx> {
+pub(crate) enum PickKind<'tcx> {
     InherentImplPick,
     ObjectPick,
     TraitPick,
@@ -189,10 +189,10 @@ pub enum PickKind<'tcx> {
     ),
 }
 
-pub type PickResult<'tcx> = Result<Pick<'tcx>, MethodError<'tcx>>;
+pub(crate) type PickResult<'tcx> = Result<Pick<'tcx>, MethodError<'tcx>>;
 
 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
-pub enum Mode {
+pub(crate) enum Mode {
     // An expression of the form `receiver.method_name(...)`.
     // Autoderefs are performed on `receiver`, lookup is done based on the
     // `self` argument of the method, and static methods aren't considered.
@@ -204,7 +204,7 @@ pub enum Mode {
 }
 
 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
-pub enum ProbeScope {
+pub(crate) enum ProbeScope {
     // Single candidate coming from pre-resolved delegation method.
     Single(DefId),
 
@@ -507,7 +507,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     providers.method_autoderef_steps = method_autoderef_steps;
 }
 
@@ -1288,7 +1288,7 @@ impl<'tcx> Pick<'tcx> {
     /// Checks whether two picks do not refer to the same trait item for the same `Self` type.
     /// Only useful for comparisons of picks in order to improve diagnostics.
     /// Do not use for type checking.
-    pub fn differs_from(&self, other: &Self) -> bool {
+    pub(crate) fn differs_from(&self, other: &Self) -> bool {
         let Self {
             item:
                 AssocItem {
@@ -1312,7 +1312,7 @@ impl<'tcx> Pick<'tcx> {
     }
 
     /// In case there were unstable name collisions, emit them as a lint.
-    pub fn maybe_emit_unstable_name_collision_hint(
+    pub(crate) fn maybe_emit_unstable_name_collision_hint(
         &self,
         tcx: TyCtxt<'tcx>,
         span: Span,

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -415,7 +415,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         err
     }
 
-    pub fn suggest_use_shadowed_binding_with_method(
+    fn suggest_use_shadowed_binding_with_method(
         &self,
         self_source: SelfSource<'tcx>,
         method_name: Ident,
@@ -4223,19 +4223,19 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 }
 
 #[derive(Copy, Clone, Debug)]
-pub enum SelfSource<'a> {
+enum SelfSource<'a> {
     QPath(&'a hir::Ty<'a>),
     MethodCall(&'a hir::Expr<'a> /* rcvr */),
 }
 
 #[derive(Copy, Clone, PartialEq, Eq)]
-pub struct TraitInfo {
+pub(crate) struct TraitInfo {
     pub def_id: DefId,
 }
 
 /// Retrieves all traits in this crate and any dependent crates,
 /// and wraps them into `TraitInfo` for custom sorting.
-pub fn all_traits(tcx: TyCtxt<'_>) -> Vec<TraitInfo> {
+pub(crate) fn all_traits(tcx: TyCtxt<'_>) -> Vec<TraitInfo> {
     tcx.all_traits().map(|def_id| TraitInfo { def_id }).collect()
 }
 

compiler/rustc_hir_typeck/src/op.rs

@@ -25,7 +25,7 @@ use crate::Expectation;
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// Checks a `a <op>= b`
-    pub fn check_binop_assign(
+    pub(crate) fn check_binop_assign(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         op: hir::BinOp,
@@ -84,7 +84,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Checks a potentially overloaded binary operator.
-    pub fn check_binop(
+    pub(crate) fn check_binop(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         op: hir::BinOp,
@@ -770,7 +770,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn check_user_unop(
+    pub(crate) fn check_user_unop(
         &self,
         ex: &'tcx hir::Expr<'tcx>,
         operand_ty: Ty<'tcx>,

compiler/rustc_hir_typeck/src/pat.rs

@@ -944,7 +944,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub fn check_dereferenceable(
+    fn check_dereferenceable(
         &self,
         span: Span,
         expected: Ty<'tcx>,

compiler/rustc_hir_typeck/src/place_op.rs

@@ -246,7 +246,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// always know whether a place needs to be mutable or not in the first pass.
     /// This happens whether there is an implicit mutable reborrow, e.g. when the type
     /// is used as the receiver of a method call.
-    pub fn convert_place_derefs_to_mutable(&self, expr: &hir::Expr<'_>) {
+    pub(crate) fn convert_place_derefs_to_mutable(&self, expr: &hir::Expr<'_>) {
         // Gather up expressions we want to munge.
         let mut exprs = vec![expr];
 

compiler/rustc_hir_typeck/src/rvalue_scopes.rs

@@ -65,7 +65,7 @@ fn record_rvalue_scope(
     }
 }
 
-pub fn resolve_rvalue_scopes<'a, 'tcx>(
+pub(crate) fn resolve_rvalue_scopes<'a, 'tcx>(
     fcx: &'a FnCtxt<'a, 'tcx>,
     scope_tree: &'a ScopeTree,
     def_id: DefId,

compiler/rustc_hir_typeck/src/typeck_root_ctxt.rs

@@ -77,7 +77,7 @@ impl<'tcx> Deref for TypeckRootCtxt<'tcx> {
 }
 
 impl<'tcx> TypeckRootCtxt<'tcx> {
-    pub fn new(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> Self {
+    pub(crate) fn new(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> Self {
         let hir_owner = tcx.local_def_id_to_hir_id(def_id).owner;
 
         let infcx = tcx.infer_ctxt().ignoring_regions().with_opaque_type_inference(def_id).build();
@@ -124,7 +124,7 @@ impl<'tcx> TypeckRootCtxt<'tcx> {
         infer_ok.value
     }
 
-    pub fn update_infer_var_info(&self, obligation: &PredicateObligation<'tcx>) {
+    fn update_infer_var_info(&self, obligation: &PredicateObligation<'tcx>) {
         let infer_var_info = &mut self.infer_var_info.borrow_mut();
 
         // (*) binder skipped

compiler/rustc_hir_typeck/src/upvar.rs

@@ -74,7 +74,7 @@ enum PlaceAncestryRelation {
 type InferredCaptureInformation<'tcx> = Vec<(Place<'tcx>, ty::CaptureInfo)>;
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn closure_analyze(&self, body: &'tcx hir::Body<'tcx>) {
+    pub(crate) fn closure_analyze(&self, body: &'tcx hir::Body<'tcx>) {
         InferBorrowKindVisitor { fcx: self }.visit_body(body);
 
         // it's our job to process these.

compiler/rustc_hir_typeck/src/writeback.rs

@@ -35,7 +35,7 @@ use crate::FnCtxt;
 // resolve_type_vars_in_body, which creates a new TypeTables which
 // doesn't contain any inference types.
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub fn resolve_type_vars_in_body(
+    pub(crate) fn resolve_type_vars_in_body(
         &self,
         body: &'tcx hir::Body<'tcx>,
     ) -> &'tcx ty::TypeckResults<'tcx> {