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))
     }
 
@@ -1386,15 +1386,15 @@ 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
     }
 
     /// Returns the current "merged type", representing our best-guess
     /// 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,